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102-682: Union Settlement was founded in 1895 by members of the Union Theological Seminary Alumni Club. After visiting Toynbee Hall in London, and inspired by the example of Hull House in Chicago, the alumni decided to create a settlement house in the area of Manhattan enclosed on the north and south by East 96th and 110th Streets and on the east and west by the East River and Central Park . Known as East Harlem, it

204-493: A long terminal repeat (LTR). Regions in the LTR act as switches to control production of new viruses and can be triggered by proteins from either HIV or the host cell. The Psi element is involved in viral genome packaging and recognized by gag and rev proteins. The SLIP element ( TTTTTT ) is involved in the frameshift in the gag - pol reading frame required to make functional pol . The term viral tropism refers to

306-535: A cell by a virion can be called "cell-free spread" to distinguish it from a more recently recognized process called "cell-to-cell spread". In cell-free spread (see figure), virus particles bud from an infected T cell, enter the blood or extracellular fluid and then infect another T cell following a chance encounter. HIV can also disseminate by direct transmission from one cell to another by a process of cell-to-cell spread, for which two pathways have been described. Firstly, an infected T cell can transmit virus directly to

408-481: A cell surface. The unusual processing and high density means that almost all broadly neutralising antibodies that have so far been identified (from a subset of patients that have been infected for many months to years) bind to, or are adapted to cope with, these envelope glycans. The molecular structure of the viral spike has now been determined by X-ray crystallography and cryogenic electron microscopy . These advances in structural biology were made possible due to

510-414: A few tested specimens might provide inconclusive results because of a low quantity specimen. In these situations, a second specimen is collected and tested for HIV infection. Modern HIV testing is extremely accurate, when the window period is taken into consideration. A single screening test is correct more than 99% of the time. The chance of a false-positive result in a standard two-step testing protocol

612-451: A human host cell when the newly formed virus particle buds from the cell. The viral envelope contains proteins from the host cell and relatively few copies of the HIV envelope protein, which consists of a cap made of three molecules known as glycoprotein (gp) 120 , and a stem consisting of three gp41 molecules that anchor the structure into the viral envelope. The envelope protein, encoded by

714-574: A key step in the progression to AIDS. A number of studies with subtype B-infected individuals have determined that between 40 and 50 percent of AIDS patients can harbour viruses of the SI and, it is presumed, the X4 phenotypes. HIV-2 is much less pathogenic than HIV-1 and is restricted in its worldwide distribution to West Africa . The adoption of "accessory genes" by HIV-2 and its more promiscuous pattern of co-receptor usage (including CD4-independence) may assist

816-613: A more stable conformation following the NC binding, in which both the DIS and the U5:AUG regions of the gRNA participate in extensive base pairing. RNA can also be processed to produce mature messenger RNAs (mRNAs). In most cases, this processing involves RNA splicing to produce mRNAs that are shorter than the full-length genome. Which part of the RNA is removed during RNA splicing determines which of

918-447: A number of mechanisms, including pyroptosis of abortively infected T cells, apoptosis of uninfected bystander cells, direct viral killing of infected cells, and killing of infected CD4 T cells by CD8 cytotoxic lymphocytes that recognize infected cells. When CD4 T cell numbers decline below a critical level, cell-mediated immunity is lost, and the body becomes progressively more susceptible to opportunistic infections, leading to

1020-619: A reduced student base. Eventually, the school agreed to lease some of its buildings to Columbia University and to transfer ownership of and responsibility for the Burke Library to Columbia. These agreements helped stabilize the school's finances, which had been hobbled by increasing library costs and the need for substantial campus repairs. On July 1, 2008, feminist theologian Serene Jones became UTS's first female president in its 172-year history, succeeding Joseph C. Hough Jr. On June 10, 2014, Jones announced that UTS would be joining

1122-669: A social worker for years at the Union Settlement, was recognized in 1919 when she was elected to membership in the National Institute of Social Sciences . With millions of immigrants arriving in the Union States in the late 19th century as the two elevated subway lines were completed, East Harlem quickly equaled the Lower East Side as Manhattan's predominantly immigrant community. Until the 1920s, it

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1224-464: A strain of SIV found in sooty mangabees. Since HIV-1 is derived from SIVcpz, and HIV-2 from SIVsm, the genetic sequence of HIV-2 is only partially homologous to HIV-1 and more closely resembles that of SIVsm. Many HIV-positive people are unaware that they are infected with the virus. For example, in 2001 less than 1% of the sexually active urban population in Africa had been tested, and this proportion

1326-558: A target T cell via a virological synapse . Secondly, an antigen-presenting cell (APC), such as a macrophage or dendritic cell, can transmit HIV to T cells by a process that either involves productive infection (in the case of macrophages) or capture and transfer of virions in trans (in the case of dendritic cells). Whichever pathway is used, infection by cell-to-cell transfer is reported to be much more efficient than cell-free virus spread. A number of factors contribute to this increased efficiency, including polarised virus budding towards

1428-625: Is a financial cooperative where members pool their assets and lend money to each other at low-interest rates. Several years later, in 1961, a $ 1 million grant from the Astor Foundation enabled Union Settlement and six other settlement houses to implement the Pre-Teen Delinquency Prevention Project. In 1965, Union Settlement became the site of one of the country's first Head Start Programs , the federally sponsored preschool initiative launched as one of

1530-460: Is an adaptation for repair of genome damage, and that recombinational variation is a byproduct that may provide a separate benefit. The final step of the viral cycle, assembly of new HIV-1 virions, begins at the plasma membrane of the host cell. The Env polyprotein (gp160) goes through the endoplasmic reticulum and is transported to the Golgi apparatus where it is cleaved by furin resulting in

1632-516: Is bound with the CD4 protein, the envelope complex undergoes a structural change, exposing the chemokine receptor binding domains of gp120 and allowing them to interact with the target chemokine receptor. This allows for a more stable two-pronged attachment, which allows the N-terminal fusion peptide gp41 to penetrate the cell membrane. Repeat sequences in gp41, HR1, and HR2 then interact, causing

1734-424: Is even lower in rural populations. Furthermore, in 2001 only 0.5% of pregnant women attending urban health facilities were counselled, tested or received their test results. Again, this proportion is even lower in rural health facilities. Since donors may therefore be unaware of their infection, donor blood and blood products used in medicine and medical research are routinely screened for HIV. HIV-1 testing

1836-464: Is high as the glycans shield the underlying viral protein from neutralisation by antibodies. This is one of the most densely glycosylated molecules known and the density is sufficiently high to prevent the normal maturation process of glycans during biogenesis in the endoplasmic and Golgi apparatus. The majority of the glycans are therefore stalled as immature 'high-mannose' glycans not normally present on human glycoproteins that are secreted or present on

1938-399: Is initially done using an enzyme-linked immunosorbent assay (ELISA) to detect antibodies to HIV-1. Specimens with a non-reactive result from the initial ELISA are considered HIV-negative, unless new exposure to an infected partner or partner of unknown HIV status has occurred. Specimens with a reactive ELISA result are retested in duplicate. If the result of either duplicate test is reactive,

2040-447: Is largely confined to West Africa . HIV is similar in structure to other retroviruses. It is roughly spherical with a diameter of about 120  nm , around 100,000 times smaller in volume than a red blood cell . It is composed of two copies of positive- sense single-stranded RNA that codes for the virus' nine genes enclosed by a conical capsid composed of 2,000 copies of the viral protein p24 . The single-stranded RNA

2142-490: Is located in the Morningside Heights neighborhood of Manhattan , New York City , bordered by Claremont Avenue , Broadway , and West 120th and 122nd Streets. The brick and limestone English Gothic revival architecture , by architects Allen & Collens , completed in 1910, includes the tower, which adapts features of the crossing tower of Durham Cathedral . Adjacent to Teachers College , Barnard College ,

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2244-612: Is more likely, leading to immunodeficiency. Three groups of HIV-1 have been identified on the basis of differences in the envelope ( env ) region: M, N, and O. Group M is the most prevalent and is subdivided into eight subtypes (or clades ), based on the whole genome, which are geographically distinct. The most prevalent are subtypes B (found mainly in North America and Europe), A and D (found mainly in Africa), and C (found mainly in Africa and Asia); these subtypes form branches in

2346-561: Is present as both free virus particles and virus within infected immune cells . Research has shown (for both same-sex and opposite-sex couples) that HIV is not contagious during sexual intercourse without a condom if the HIV-positive partner has a consistently undetectable viral load . HIV infects vital cells in the human immune system, such as helper T cells (specifically CD4 T cells), macrophages , and dendritic cells . HIV infection leads to low levels of CD4 T cells through

2448-790: Is the oldest independent seminary in the United States and has long been known as a bastion of progressive Christian scholarship, with a number of prominent thinkers among its faculty or alumni. It was founded in 1836 by members of the Presbyterian Church in the USA , but was open to students of all denominations. In 1893, UTS rescinded the right of the General Assembly of the Presbyterian Church to veto faculty appointments, thus becoming fully independent. In

2550-412: Is tightly bound to nucleocapsid proteins, p7, and enzymes needed for the development of the virion such as reverse transcriptase , proteases , ribonuclease and integrase . A matrix composed of the viral protein p17 surrounds the capsid ensuring the integrity of the virion particle. This is, in turn, surrounded by the viral envelope , that is composed of the lipid bilayer taken from the membrane of

2652-534: Is unknown how often such mixed packaging occurs under natural conditions. Bonhoeffer et al. suggested that template switching by reverse transcriptase acts as a repair process to deal with breaks in the single-stranded RNA genome. In addition, Hu and Temin suggested that recombination is an adaptation for repair of damage in the RNA genomes. Strand switching (copy-choice recombination) by reverse transcriptase could generate an undamaged copy of genomic DNA from two damaged single-stranded RNA genome copies. This view of

2754-638: The African green monkey (SIVagm) and sooty mangabey (SIVsmm) are thought to have a long evolutionary history with their hosts. These hosts have adapted to the presence of the virus, which is present at high levels in the host's blood, but evokes only a mild immune response, does not cause the development of simian AIDS, and does not undergo the extensive mutation and recombination typical of HIV infection in humans. In contrast, when these strains infect species that have not adapted to SIV ("heterologous" or similar hosts such as rhesus or cynomologus macaques ),

2856-681: The Auburn Theological Seminary moved to its campus and departed in 2014. Among its graduates were the historian of Christianity Arthur McGiffert ; biblical scholar James Moffatt ; Harry Emerson Fosdick , the pastor of Riverside Church who served as professor during his tenure there; and the Socialist leader Norman Thomas . In 1895, members of the Union Theological Seminary Alumni Club founded Union Settlement Association , one of

2958-544: The CCR5-Δ32 mutation are resistant to infection by the R5 virus, as the mutation leaves HIV unable to bind to this co-receptor, reducing its ability to infect target cells. Sexual intercourse is the major mode of HIV transmission. Both X4 and R5 HIV are present in the seminal fluid , which enables the virus to be transmitted from a male to his sexual partner . The virions can then infect numerous cellular targets and disseminate into

3060-474: The COVID-19 pandemic , Union Settlement helped provide vaccination services to many East Harlem residents. In June 2023, Union Settlement appointed Rev. Dr. Darlene Williams as the first person of Color to serve as President & Chief Executive Officer of Union Settlement. Union Settlement celebrates its 130th Anniversary in 2025 Union Settlement provides a variety of community and individual services to

3162-796: The Great Society undertakings. With more recent history, Settlement Health and Medical Services, part of a 1974 federal initiative, provided primary health care to East Harlem residents in a free-standing clinic. The program is separately incorporated in 1976. In 1992, Union Settlement was selected to serve as the lead agency of the East Harlem HIV Care Network, a coalition of over 100 social and health service agencies that address issues of AIDS . Network members serve people who are HIV positive or are living with HIV/AIDS, and their relatives and partners Union Settlement celebrated its 125th year in operation in 2020. In wake of

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3264-676: The Jewish Theological Seminary of America , and the Manhattan School of Music , Union has cross-registration and library access agreements with all of these schools. The building was added to the National Register of Historic Places on April 23, 1980, and parts were made a New York City designated landmark in 1965. Some sections of the campus are now on long-term lease to Columbia University. The Burke Library at Union Theological Seminary, one of

3366-572: The Teachers College, Columbia University , New York Theological Seminary , and the Jewish Theological Seminary of America . HIV The human immunodeficiency viruses ( HIV ) are two species of Lentivirus (a subgroup of retrovirus ) that infect humans. Over time, they cause acquired immunodeficiency syndrome (AIDS), a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Without treatment,

3468-445: The adsorption of glycoproteins on its surface to receptors on the target cell followed by fusion of the viral envelope with the target cell membrane and the release of the HIV capsid into the cell. Entry to the cell begins through interaction of the trimeric envelope complex ( gp160 spike) on the HIV viral envelope and both CD4 and a chemokine co-receptor (generally either CCR5 or CXCR4 , but others are known to interact) on

3570-421: The gag polyproteins still need to be cleaved into the actual matrix, capsid and nucleocapsid proteins. This cleavage is mediated by the packaged viral protease and can be inhibited by antiretroviral drugs of the protease inhibitor class. The various structural components then assemble to produce a mature HIV virion. Only mature virions are then able to infect another cell. The classical process of infection of

3672-514: The microtubule -based transport to the nucleus, the viral single-strand RNA genome is transcribed into double-strand DNA, which is then integrated into a host chromosome. HIV can infect dendritic cells (DCs) by this CD4-CCR5 route, but another route using mannose-specific C-type lectin receptors such as DC-SIGN can also be used. DCs are one of the first cells encountered by the virus during sexual transmission. They are currently thought to play an important role by transmitting HIV to T cells when

3774-403: The phylogenetic tree representing the lineage of the M group of HIV-1. Co-infection with distinct subtypes gives rise to circulating recombinant forms (CRFs). In 2000, the last year in which an analysis of global subtype prevalence was made, 47.2% of infections worldwide were of subtype C, 26.7% were of subtype A/CRF02_AG, 12.3% were of subtype B, 5.3% were of subtype D, 3.2% were of CRF_AE, and

3876-438: The α -chemokine receptor, CXCR4 , for entry. Dual-tropic HIV-1 strains are thought to be transitional strains of HIV-1 and thus are able to use both CCR5 and CXCR4 as co-receptors for viral entry. The α -chemokine SDF-1 , a ligand for CXCR4, suppresses replication of T-tropic HIV-1 isolates. It does this by down-regulating the expression of CXCR4 on the surface of HIV target cells. M-tropic HIV-1 isolates that use only

3978-427: The β -chemokine receptor, CCR5 , for entry and are thus able to replicate in both macrophages and CD4 T cells. This CCR5 co-receptor is used by almost all primary HIV-1 isolates regardless of viral genetic subtype. Indeed, macrophages play a key role in several critical aspects of HIV infection. They appear to be the first cells infected by HIV and perhaps the source of HIV production when CD4 cells become depleted in

4080-557: The 1960s, to the natural world. The New York Committee of the American Birth Control League opened a Birth Control Clinic at Union Settlement in 1932. The clinic is one of the earliest in the city and in East Harlem. During the mid-20th century, Union Settlement services began evolving with the needs of East Harlem. 1957, Union Settlement Federal Credit Union opened its doors for business. The credit union

4182-581: The 20th century, Union became a center of liberal Christianity . It served as the birthplace of the Black theology , womanist theology , and other theological movements. It houses the Burke Library at Union Theological Seminary , one of the largest theological libraries in the Western Hemisphere. Union Theological Seminary was founded in 1836. During the late 19th century it became one of

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4284-868: The Archives of Women in Theological Scholarship and the Missionary Research Library Archives. In 2004, the Burke Library became fully integrated into the Columbia University Libraries system, which holds over 14 million volumes. The library is named in honor of Walter Burke, a generous benefactor to the library who served as chairman of the Board of Directors of the Seminary from 1976 to 1982. Both Reinhold Niebuhr and Paul Tillich taught at

4386-587: The CCR5 receptor are termed R5; those that use only CXCR4 are termed X4, and those that use both, X4R5. However, the use of co-receptors alone does not explain viral tropism, as not all R5 viruses are able to use CCR5 on macrophages for a productive infection and HIV can also infect a subtype of myeloid dendritic cells , which probably constitute a reservoir that maintains infection when CD4 T cell numbers have declined to extremely low levels. Some people are resistant to certain strains of HIV. For example, people with

4488-405: The DIS (dimerization initiation signal) hairpin is exposed. The formation of the gRNA dimer is mediated by a 'kissing' interaction between the DIS hairpin loops of the gRNA monomers. At the same time, certain guanosine residues in the gRNA are made available for binding of the nucleocapsid (NC) protein leading to the subsequent virion assembly. The labile gRNA dimer has been also reported to achieve

4590-419: The HIV env gene, allows the virus to attach to target cells and fuse the viral envelope with the target cell's membrane releasing the viral contents into the cell and initiating the infectious cycle. As the sole viral protein on the surface of the virus, the envelope protein is a major target for HIV vaccine efforts. Over half of the mass of the trimeric envelope spike is N-linked glycans . The density

4692-441: The HIV protein-coding sequences is translated. Mature HIV mRNAs are exported from the nucleus into the cytoplasm , where they are translated to produce HIV proteins, including Rev . As the newly produced Rev protein is produced it moves to the nucleus, where it binds to full-length, unspliced copies of virus RNAs and allows them to leave the nucleus. Some of these full-length RNAs function as mRNAs that are translated to produce

4794-570: The HIV virological synapse in vivo . The many dissemination mechanisms available to HIV contribute to the virus' ongoing replication in spite of anti-retroviral therapies. HIV differs from many viruses in that it has very high genetic variability . This diversity is a result of its fast replication cycle , with the generation of about 10 virions every day, coupled with a high mutation rate of approximately 3 x 10 per nucleotide base per cycle of replication and recombinogenic properties of reverse transcriptase. This complex scenario leads to

4896-526: The LTR promoter acting by binding the TAR RNA element. The TAR may also be processed into microRNAs that regulate the apoptosis genes ERCC1 and IER3 . The rev protein (p19) is involved in shuttling RNAs from the nucleus and the cytoplasm by binding to the RRE RNA element. The vif protein (p23) prevents the action of APOBEC3G (a cellular protein that deaminates cytidine to uridine in

4998-751: The Nazis. He took the last ship from New York to Germany in late August 1939. Due to his secret involvement with the 20 July plot on Hitler's life, he was executed at the Flossenbürg concentration camp on April 8, 1945, only 15 days before the United States Army liberated the camp. American theologian, James Hal Cone , one of the founders of liberation theology and influential in the development of Black theology , began teaching at Union Theological Seminary in New York City in 1970, holding

5100-433: The U.S.: Although IFA can be used to confirm infection in these ambiguous cases, this assay is not widely used. In general, a second specimen should be collected more than a month later and retested for persons with indeterminate western blot results. Although much less commonly available, nucleic acid testing (e.g., viral RNA or proviral DNA amplification method) can also help diagnosis in certain situations. In addition,

5202-409: The adaptive benefit of recombination in HIV could explain why each HIV particle contains two complete genomes, rather than one. Furthermore, the view that recombination is a repair process implies that the benefit of repair can occur at each replication cycle, and that this benefit can be realized whether or not the two genomes differ genetically. On the view that recombination in HIV is a repair process,

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5304-423: The advent of AIDS. HIV-positive patients acquire an enormously broad spectrum of opportunistic infections, which was particularly problematic prior to the onset of HAART therapies; however, the same infections are reported among HIV-infected patients examined post-mortem following the onset of antiretroviral therapies. Thus, during the course of infection, viral adaptation to the use of CXCR4 instead of CCR5 may be

5406-403: The animals develop AIDS and the virus generates genetic diversity similar to what is seen in human HIV infection. Chimpanzee SIV (SIVcpz), the closest genetic relative of HIV-1, is associated with increased mortality and AIDS-like symptoms in its natural host. SIVcpz appears to have been transmitted relatively recently to chimpanzee and human populations, so their hosts have not yet adapted to

5508-545: The average survival time after infection with HIV is estimated to be 9 to 11 years, depending on the HIV subtype . In most cases, HIV is a sexually transmitted infection and occurs by contact with or transfer of blood , pre-ejaculate , semen , and vaginal fluids . Non-sexual transmission can occur from an infected mother to her infant during pregnancy , during childbirth by exposure to her blood or vaginal fluid, and through breast milk . Within these bodily fluids, HIV

5610-592: The cell as new virus particles that will begin the replication cycle anew. Two types of HIV have been characterized: HIV-1 and HIV-2. HIV-1 is the virus that was initially discovered and termed both lymphadenopathy associated virus (LAV) and human T-lymphotropic virus 3 (HTLV-III). HIV-1 is more virulent and more infective than HIV-2, and is the cause of the majority of HIV infections globally. The lower infectivity of HIV-2, compared to HIV-1, implies that fewer of those exposed to HIV-2 will be infected per exposure. Due to its relatively poor capacity for transmission, HIV-2

5712-470: The cell types a virus infects. HIV can infect a variety of immune cells such as CD4 T cells , macrophages , and microglial cells . HIV-1 entry to macrophages and CD4 T cells is mediated through interaction of the virion envelope glycoproteins (gp120) with the CD4 molecule on the target cells' membrane and also with chemokine co-receptors . Macrophage-tropic (M-tropic) strains of HIV-1, or non- syncytia -inducing strains (NSI; now called R5 viruses ) use

5814-424: The center of both liberal and neo-orthodox Protestantism in the inter-war period. Niebuhr joined UTS in 1929 and Tillich in 1933. Prominent public intellectual Cornel West commenced a promising academic career at UTS in 1977. As liberalism lost ground to conservatism after the 1960s (while neo-orthodoxy dissipated) and thus declined in prestige, UTS ran into financial difficulties and shrank significantly because of

5916-459: The collapse of the extracellular portion of gp41 into a hairpin shape. This loop structure brings the virus and cell membranes close together, allowing fusion of the membranes and subsequent entry of the viral capsid. After HIV has bound to the target cell, the HIV RNA and various enzymes, including reverse transcriptase, integrase, ribonuclease, and protease, are injected into the cell. During

6018-437: The community and beyond, including New York Secretary of State Lorraine Cortes-Vazquez and City Council Member Robert Jackson. Hollywood movie star Burt Lancaster played sports, acted in theater productions, and learned circus arts at Union Settlement as a boy. He credited Union Settlement for "saving him from the streets," and supported the organization all his life. In 1895 Union Settlement opened at 202 E. 96th Street, on

6120-564: The community in East Harlem , including: Union Theological Seminary in the City of New York Union Theological Seminary in the City of New York (shortened to UTS or Union ) is a private ecumenical liberal Christian seminary in Morningside Heights , Manhattan , affiliated with Columbia University . Columbia University lists UTS among its affiliate schools, alongside Barnard College and Teachers College . Since 1928,

6222-447: The development of AIDS. HIV is a member of the genus Lentivirus , part of the family Retroviridae . Lentiviruses have many morphologies and biological properties in common. Many species are infected by lentiviruses, which are characteristically responsible for long-duration illnesses with a long incubation period . Lentiviruses are transmitted as single-stranded , positive- sense , enveloped RNA viruses . Upon entry into

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6324-577: The development of stable recombinant forms of the viral spike by the introduction of an intersubunit disulphide bond and an isoleucine to proline mutation ( radical replacement of an amino acid) in gp41. The so-called SOSIP trimers not only reproduce the antigenic properties of the native viral spike, but also display the same degree of immature glycans as presented on the native virus. Recombinant trimeric viral spikes are promising vaccine candidates as they display less non-neutralising epitopes than recombinant monomeric gp120, which act to suppress

6426-618: The distinguished Charles A. Briggs Chair in systematic theology from 1977 until his death in 2018. Serene Jones, the seminary's first female president, was inaugurated in November 2008. replacing Joseph Hough , UTS' immediate past president. Civil rights activist Cornel West joined the faculty in July 2012, and rejoined again in 2021. Several of Union's members also teach in the Religious Studies department at Columbia University ,

6528-431: The generation of many variants of HIV in a single infected patient in the course of one day. This variability is compounded when a single cell is simultaneously infected by two or more different strains of HIV. When simultaneous infection occurs, the genome of progeny virions may be composed of RNA strands from two different strains. This hybrid virion then infects a new cell where it undergoes replication. As this happens,

6630-576: The generation of recombinational variation would be a consequence, but not the cause of, the evolution of template switching. HIV-1 infection causes chronic inflammation and production of reactive oxygen species . Thus, the HIV genome may be vulnerable to oxidative damage , including breaks in the single-stranded RNA. For HIV, as well as for viruses in general, successful infection depends on overcoming host defense strategies that often include production of genome-damaging reactive oxygen species. Thus, Michod et al. suggested that recombination by viruses

6732-552: The genetic information that is transmitted from parental to progeny genomes. Viral recombination produces genetic variation that likely contributes to the evolution of resistance to anti-retroviral therapy . Recombination may also contribute, in principle, to overcoming the immune defenses of the host. Yet, for the adaptive advantages of genetic variation to be realized, the two viral genomes packaged in individual infecting virus particles need to have arisen from separate progenitor parental viruses of differing genetic constitution. It

6834-496: The immigrant and low-income residents of East Harlem. One of East Harlem's largest social service agencies, Union Settlement reaches more than 13,000 people annually at 17 locations throughout East Harlem through a range of programs, including early childhood education, youth development, senior services, job training, the arts, adult education, nutrition, counseling, a farmers' market, community development, and neighborhood cultural events. Reinhold Niebuhr and Paul Tillich made UTS

6936-415: The immune response to target epitopes. The RNA genome consists of at least seven structural landmarks ( LTR , TAR , RRE , PE, SLIP, CRS, and INS), and nine genes ( gag , pol , and env , tat , rev , nef , vif , vpr , vpu , and sometimes a tenth tev , which is a fusion of tat , env and rev ), encoding 19 proteins. Three of these genes, gag , pol , and env , contain information needed to make

7038-521: The integrated DNA provirus is transcribed into RNA. The full-length genomic RNAs (gRNA) can be packaged into new viral particles in a pseudodiploid form. The selectivity in the packaging is explained by the structural properties of the dimeric conformer of the gRNA. The gRNA dimer is characterized by a tandem three-way junction within the gRNA monomer, in which the SD and AUG hairpins , responsible for splicing and translation respectively, are sequestered and

7140-527: The largest theological libraries in North America, contains over 700,000 items. Burke's holdings include extensive special collections, including Greek census records from 20 CE, a rare 12th-century manuscript of the Life of St. Boniface, and one of the first African-American hymnals, published in Philadelphia in 1818. The Burke Library also maintains a number of world-renowned archival collections, including

7242-459: The leading centers of liberal Christianity in the United States. In 1891, Charles A. Briggs , who was being installed as the chair of biblical studies, delivered an inaugural address in which he questioned the verbal inspiration of Scripture. When the General Assembly of the Presbyterian Church in the U.S.A. vetoed Briggs' appointment and eventually deposed Briggs for heresy two years later, Union removed itself from denominational oversight. In 1939,

7344-593: The most basic questions. They become intoxicated with liberal and humanistic phrases, are amused at the fundamentalists, and yet basically are not even up to their level...." Referring to Union Seminary, Bonhoeffer noted: "A seminary in which numerous students openly laugh during a public lecture because they find it amusing when a passage on sin and forgiveness ...is cited has obviously, despite its many advantages, forgotten what Christian theology in its very essence stands for" (pp. 309–10). He soon regretted his decision and decided that he had to return to Germany to resist

7446-573: The movement to divest from the fossil fuels industry in protest at the damage the industry is causing to the environment. UTS's $ 108 million endowment will no longer include any fossil fuel investments. On May 9, 2024, UTS's Board of Trustees voted to endorse divestment from "companies profiting from the war in Palestine" and announced that they will be joining the Interfaith Center on Corporate Responsibility . Classroom and faculty space

7548-464: The oldest settlement houses in New York City. After visiting Toynbee Hall in London and inspired by the example of Hull House in Chicago, the alumni decided to create a settlement house in the area of Manhattan enclosed on the north and south by East 96th and 110th Streets and on the east and west by the East River and Central Park . The neighborhood, known as East Harlem , was filled with new tenements but devoid of any civic services. The ethos of

7650-410: The patient. Macrophages and microglial cells are the cells infected by HIV in the central nervous system . In the tonsils and adenoids of HIV-infected patients, macrophages fuse into multinucleated giant cells that produce huge amounts of virus. T-tropic strains of HIV-1, or syncytia -inducing strains (SI; now called X4 viruses ) replicate in primary CD4 T cells as well as in macrophages and use

7752-406: The remaining 5.3% were composed of other subtypes and CRFs. Most HIV-1 research is focused on subtype B; few laboratories focus on the other subtypes. The existence of a fourth group, "P", has been hypothesised based on a virus isolated in 2009. The strain is apparently derived from gorilla SIV (SIVgor), first isolated from western lowland gorillas in 2006. HIV-2's closest relative is SIVsm,

7854-425: The reverse transcriptase, by jumping back and forth between the two different RNA templates, will generate a newly synthesized retroviral DNA sequence that is a recombinant between the two parental genomes. This recombination is most obvious when it occurs between subtypes. The closely related simian immunodeficiency virus (SIV) has evolved into many strains, classified by the natural host species. SIV strains of

7956-911: The second floor of a tenement building. Union Theological Seminary student William E. McCord was appointed its first "headworker" (as its directors were known). It moved twice in 1895 (210 E. 104th Street and 237 E. 104th Street). Several, years later, in 1899 Morris K. Jesup purchased five houses (235-243 E. 104th Street) for the Settlement. McCord's term as headworker ended in 1901 following his resignation, and Gaylord S. White replaced him, eventually serving in that position for 22 years. In 1917, Union Settlement established three campgrounds in Palisades Interstate Park : Camp Nathan Hale for boys, Camp Gaylord White for girls and Camp Ellen Marvin for mothers and young children. The camps exposed tens of thousands of inner-city youngsters, from 1917 to

8058-670: The seminary has served as Columbia's constituent faculty of theology. In 1964, UTS also established an affiliation with the neighboring Jewish Theological Seminary of America . Despite its affiliation with Columbia University, UTS is an independent institution with its own administration and Board of Trustees. UTS confers the following degrees: Master of Divinity (MDiv), Master of Divinity & Social Work dual degree (MDSW), Master of Arts in religion (MAR), Master of Arts in Social Justice (MASJ), Master of Sacred Theology (STM), Doctor of Ministry (DMin), and Doctor of Philosophy (PhD). UTS

8160-679: The seminary. Nieburhr joined the faculty in 1929 and retired in 1952. Tillich was recruited by Niebuhr to UTS following his dismissal from the University of Frankfurt. Nazi officials terminated Tillich from the University of Frankfurt and placed him on their list of "undesirables". Tillich subsequently narrowly escaped arrest by the Gestapo in October 1933 and made his way out of Germany joining UTS in December 1933. In 1930, Dietrich Bonhoeffer

8262-498: The settlement house movement called for its workers to "settle" in such neighborhoods in order to learn first-hand the problems of the residents. "It seemed to us that, as early settlers, we had a chance to grow up with the community and affect its development," wrote William Adams Brown, Theology Professor, Union Theological Society (1892–1930) and President, Union Settlement Association (1915–1919). Union Settlement still exists, providing community-based services and programs to support

8364-519: The single-stranded viral DNA and/or interferes with reverse transcription ). The vpr protein (p14) arrests cell division at G2/M . The nef protein (p27) down-regulates CD4 (the major viral receptor), as well as the MHC class I and class II molecules. Nef also interacts with SH3 domains . The vpu protein (p16) influences the release of new virus particles from infected cells. The ends of each strand of HIV RNA contain an RNA sequence called

8466-412: The site of cell-to-cell contact, close apposition of cells, which minimizes fluid-phase diffusion of virions, and clustering of HIV entry receptors on the target cell towards the contact zone. Cell-to-cell spread is thought to be particularly important in lymphoid tissues , where CD4 T cells are densely packed and likely to interact frequently. Intravital imaging studies have supported the concept of

8568-673: The specimen is reported as repeatedly reactive and undergoes confirmatory testing with a more specific supplemental test (e.g., a polymerase chain reaction (PCR), western blot or, less commonly, an immunofluorescence assay (IFA)). Only specimens that are repeatedly reactive by ELISA and positive by IFA or PCR or reactive by western blot are considered HIV-positive and indicative of HIV infection. Specimens that are repeatedly ELISA-reactive occasionally provide an indeterminate western blot result, which may be either an incomplete antibody response to HIV in an infected person or nonspecific reactions in an uninfected person. HIV deaths in 2014 excluding

8670-556: The structural proteins Gag and Env. Gag proteins bind to copies of the virus RNA genome to package them into new virus particles. HIV-1 and HIV-2 appear to package their RNA differently. HIV-1 will bind to any appropriate RNA. HIV-2 will preferentially bind to the mRNA that was used to create the Gag protein itself. Two RNA genomes are encapsidated in each HIV-1 particle (see Structure and genome of HIV ). Upon infection and replication catalyzed by reverse transcriptase, recombination between

8772-496: The structural proteins for new virus particles. For example, env codes for a protein called gp160 that is cut in two by a cellular protease to form gp120 and gp41. The six remaining genes, tat , rev , nef , vif , vpr , and vpu (or vpx in the case of HIV-2), are regulatory genes for proteins that control the ability of HIV to infect cells, produce new copies of virus (replicate), or cause disease. The two tat proteins (p16 and p14) are transcriptional transactivators for

8874-427: The target cell surface. Gp120 binds to integrin α 4 β 7 activating LFA-1 , the central integrin involved in the establishment of virological synapses , which facilitate efficient cell-to-cell spreading of HIV-1. The gp160 spike contains binding domains for both CD4 and chemokine receptors. The first step in fusion involves the high-affinity attachment of the CD4 binding domains of gp120 to CD4. Once gp120

8976-413: The target cell, the viral RNA genome is converted (reverse transcribed) into double-stranded DNA by a virally encoded enzyme, reverse transcriptase , that is transported along with the viral genome in the virus particle. The resulting viral DNA is then imported into the cell nucleus and integrated into the cellular DNA by a virally encoded enzyme, integrase , and host co-factors . Once integrated,

9078-414: The two HIV envelope glycoproteins, gp41 and gp120 . These are transported to the plasma membrane of the host cell where gp41 anchors gp120 to the membrane of the infected cell. The Gag (p55) and Gag-Pol (p160) polyproteins also associate with the inner surface of the plasma membrane along with the HIV genomic RNA as the forming virion begins to bud from the host cell. The budded virion is still immature as

9180-484: The two genomes can occur. Recombination occurs as the single-strand, positive-sense RNA genomes are reverse transcribed to form DNA. During reverse transcription, the nascent DNA can switch multiple times between the two copies of the viral RNA. This form of recombination is known as copy-choice. Recombination events may occur throughout the genome. Anywhere from two to 20 recombination events per genome may occur at each replication cycle, and these events can rapidly shuffle

9282-570: The viral DNA into the host cell's genome is carried out by another viral enzyme called integrase . The integrated viral DNA may then lie dormant, in the latent stage of HIV infection. To actively produce the virus, certain cellular transcription factors need to be present, the most important of which is NF- κ B (nuclear factor kappa B), which is upregulated when T cells become activated. This means that those cells most likely to be targeted, entered and subsequently killed by HIV are those actively fighting infection. During viral replication,

9384-536: The virus in its adaptation to avoid innate restriction factors present in host cells. Adaptation to use normal cellular machinery to enable transmission and productive infection has also aided the establishment of HIV-2 replication in humans. A survival strategy for any infectious agent is not to kill its host, but ultimately become a commensal organism. Having achieved a low pathogenicity, over time, variants that are more successful at transmission will be selected. The HIV virion enters macrophages and CD4 T cells by

9486-425: The virus is captured in the mucosa by DCs. The presence of FEZ-1 , which occurs naturally in neurons , is believed to prevent the infection of cells by HIV. HIV-1 entry, as well as entry of many other retroviruses, has long been believed to occur exclusively at the plasma membrane. More recently, however, productive infection by pH -independent, clathrin-mediated endocytosis of HIV-1 has also been reported and

9588-463: The virus may become latent , allowing the virus and its host cell to avoid detection by the immune system, for an indeterminate amount of time. The virus can remain dormant in the human body for up to ten years after primary infection; during this period the virus does not cause symptoms. Alternatively, the integrated viral DNA may be transcribed , producing new RNA genomes and viral proteins, using host cell resources, that are packaged and released from

9690-403: The virus to evade the body's immune system. The reverse transcriptase also has ribonuclease activity that degrades the viral RNA during the synthesis of cDNA, as well as DNA-dependent DNA polymerase activity that creates a sense DNA from the antisense cDNA. Together, the cDNA and its complement form a double-stranded viral DNA that is then transported into the cell nucleus . The integration of

9792-540: The virus. This virus has also lost a function of the nef gene that is present in most SIVs. For non-pathogenic SIV variants, nef suppresses T cell activation through the CD3 marker. Nef 's function in non-pathogenic forms of SIV is to downregulate expression of inflammatory cytokines , MHC-1 , and signals that affect T cell trafficking. In HIV-1 and SIVcpz, nef does not inhibit T-cell activation and it has lost this function. Without this function, T cell depletion

9894-475: The whole organism. However, a selection process leads to a predominant transmission of the R5 virus through this pathway. In patients infected with subtype B HIV-1, there is often a co-receptor switch in late-stage disease and T-tropic variants that can infect a variety of T cells through CXCR4. These variants then replicate more aggressively with heightened virulence that causes rapid T cell depletion, immune system collapse, and opportunistic infections that mark

9996-425: Was New York's true " Little Italy ," claiming the largest population of Italians outside of Italy. The neighborhood had a progressive, reformist commitment: Mayor Fiorello LaGuardia lived in East Harlem, spoke often at Union Settlement, and personified the political activism of the area. Union Settlement's work has helped tens of thousands of children, youth, and adults, many of whom have gone on to become leaders in

10098-481: Was a Postgraduate Teaching Fellow at the seminary. He later returned in 1939 to be a member of the faculty and to escape Nazi harassment in Germany. Writing of his experience there in his book Barcelona, Berlin, New York , Bonhoeffer was dismayed by the liberalism of the seminary and its students, noting, "The students are completely clueless with respect to what dogmatics is really about. They are not familiar with even

10200-566: Was a neighborhood filled with new tenements but devoid of any civic services. The ethos of the settlement house movement called for its workers to “settle” in such neighborhoods in order to learn first-hand the problems of the residents. "It seemed to us that, as early settlers, we had a chance to grow up with the community and affect its development," wrote William Adams Brown , Theology Professor, Union Theological Society (1892–1930) and President, Union Settlement Association (1915–1919). The long service record of his wife, Helen Gilman Noyes Brown ,

10302-551: Was added to UTS in the early 2020s as part of the construction of Claremont Hall, a 41-story residential condominium at 100 Claremont Avenue. UTS owns 27 of the apartments in Claremont Hall. Although administratively independent from Columbia, UTS is affiliated through representation by one voting faculty member and one non-voting student observer in the Columbia University Senate . UTS's campus

10404-448: Was recently suggested to constitute the only route of productive entry. Shortly after the viral capsid enters the cell, an enzyme called reverse transcriptase liberates the positive-sense single-stranded RNA genome from the attached viral proteins and copies it into a complementary DNA (cDNA) molecule. The process of reverse transcription is extremely error-prone, and the resulting mutations may cause drug resistance or allow

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