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74-537: In archaeogenetics , the term Scandinavian hunter-gatherer (SHG) is the name given to a distinct ancestral component that represents descent from Mesolithic hunter-gatherers of Scandinavia . Genetic studies suggest that the SHGs were a mix of western hunter-gatherers (WHGs) initially populating Scandinavia from the south during the Holocene , and eastern hunter-gatherers (EHGs), who later entered Scandinavia from

148-560: A WHG population that had entered Scandinavia from the south, and an EHG population which had entered Scandinavia from the northeast along the coast. The WHGs who entered Scandinavia are believed to have belonged to the Ahrensburg culture . These WHGs and EHGs had subsequently mixed, and the SHGs gradually developed their distinct character. The SHGs from western and northern Scandinavia had more EHG ancestry (c. 49%) than individuals from eastern Scandinavia (c. 38%). The SHGs were found to have

222-431: A basic laboratory setup and chemicals. It is also independent of sample size, as the process can be scaled to accommodate larger or smaller quantities. Another benefit is that the process can be executed at room temperature. However, this method does contain some drawbacks. Mainly, silica-based DNA extraction can only be applied to bone and teeth samples; they cannot be used on soft tissue . While they work well with

296-543: A cause of oculocutaneous albinism type 4. Alternative splicing results in multiple transcript variants encoding different isoforms. Protein expression is localized to the melanosome, and analysis of the by knockdown of RNA expression leads to altered melanosome pH potentially altering tyrosinase function by affecting copper binding. In melanocytic cell types, the SLC45A2 gene is regulated by microphthalmia-associated transcription factor . SLC45A2 has been found to play

370-545: A closely related extant species can be used to estimate the divergence time of those two species from their last common ancestor . The phylogeny of some extinct species, such as Australian marsupial wolves and American ground sloths , has been constructed by this method. Mitochondrial DNA in animals and chloroplast DNA in plants are usually used for this purpose because they have hundreds of copies per cell and thus are more easily accessible in ancient fossils. Another method to investigate relationship between two species

444-477: A date of over 300 kya. Examination of mitochondrial DNA (mtDNA), Y-chromosome DNA, and X-chromosome DNA indicate that the earliest population to leave Africa consisted of approximately 1500 males and females. It has been suggested by various studies that populations were geographically “structured” to some degree prior to the expansion out of Africa; this is suggested by the antiquity of shared mtDNA lineages. One study of 121 populations from various places throughout

518-558: A genetic adaptation to high latitude environments, including high frequencies of low pigmentation variants and genes designed for adaptation to the cold and physical performance. SHGs displayed a high frequency of the depigmentation alleles SLC45A2 and SLC24A5 , and the OCA/Herc2 , which affects eye pigmentation. These genes were much less common among WHGs and EHGs. A surprising continuity was displayed between SHGs and modern populations of Northern Europe in certain respects. Most notably,

592-404: A mutation in this gene underlies the white tiger variant. In dogs a mutation to this gene causes white fur, pink skin, and blue eyes. SLC45A2 was identified as a melanoma tumor-associated antigen with high tumor specificity and reduced potential for autoimmune toxicity, and is currently in clinical development as a target for T-cell based immunotherapy. This article incorporates text from

666-442: A role in pigmentation in several species. In humans, it has been identified as a factor in the light skin of Europeans and as an ancestry-informative marker (AIM) for distinguishing Sri Lankan from European ancestry. Mutations in the gene have also been identified as the cause of human Type IV oculocutaneous albinism . SLC45A2 is the so-called cream gene responsible in horses for buckskin, palomino and cremello coloration, while

740-562: A sample, even when it is highly fragmented and of low concentration. It involves attaching a generic sequence to every single strand that generic primers can bond to, and thus all of the DNA present is amplified. This is generally more costly and time intensive than PCR but due to the difficulties involved in ancient DNA amplification it is cheaper and more efficient. One method of massive parallel sequencing , developed by Margulies et al., employs bead-based emulsion PCR and pyrosequencing , and

814-608: A similarity in 2.18 and 1.62 bases per 10,000 respectively, suggesting Vi-80 sample was from a male individual. Other similar studies include finding of a mutation associated with dwarfism in Arabidopsis in ancient Nubian cotton , and investigation on the bitter taste perception locus in Neanderthals. Modern humans are thought to have evolved in Africa at least 200 kya (thousand years ago), with some evidence suggesting

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888-607: A single migratory event between 60 and 70 kya. Genetic evidence shows that occupation of the Near East and Europe happened no earlier than 50 kya. Studying haplogroup U has shown separate dispersals from the Near East both into Europe and into North Africa. Much of the work done in archaeogenetics focuses on the Neolithic transition in Europe. Cavalli-Svorza's analysis of genetic-geographic patterns led him to conclude that there

962-402: A specimen is collected from an archaeological site, DNA can be extracted through a series of processes. One of the more common methods utilizes silica and takes advantage of polymerase chain reactions in order to collect ancient DNA from bone samples. There are several challenges that add to the difficulty when attempting to extract ancient DNA from fossils and prepare it for analysis. DNA

1036-500: A third (SF9) was predicted to have had light hair and brown eyes; and a fourth individual (SBj) was predicted to have had light hair, with the most likely hair colour being blonde, and blue eyes. Of the SHGs from Motala, four were probably dark-haired, and two others were probably light-haired, and may have been blond. In addition, all of the six SHGs from Motala had high probabilities of being blue-eyed. Both light and dark skin pigmentation alleles are found at intermediate frequencies in

1110-493: A trading network for the production and consumption of readily available resources. Archaeogenetics has been used to study the domestication of animals. By analyzing genetic diversity in domesticated animal populations researchers can search for genetic markers in DNA to give valuable insight about possible traits of progenitor species. These traits are then used to help distinguish archaeological remains between wild and domesticated specimens. The genetic studies can also lead to

1184-492: A variety of different fossils, they may be less effective in fossils that are not fresh (e.g. treated fossils for museums ). Also, contamination poses a risk for all DNA replication in general, and this method may result in misleading results if applied to contaminated material. Polymerase chain reaction is a process that can amplify segments of DNA and is often used on extracted ancient DNA. It has three main steps: denaturation , annealing , and extension. Denaturation splits

1258-399: A “pioneer colonization” model of European occupation, with incorporation of foraging populations into arriving Neolithic populations. Furthermore, analysis of ancient DNA, not just extant DNA, is shedding light on some issues. For instance, comparison of neolithic and mesolithic DNA has indicated that the development of dairying preceded widespread lactose tolerance. South Asia has served as

1332-524: Is a protein that in humans is encoded by the SLC45A2 gene . SLC45A2 is a transporter protein that mediates melanin synthesis. It may regulate the pH of the melanosome , affecting tyrosinase activity. SLC45A2 is also a melanocyte differentiation antigen that is expressed in a high percentage of melanoma cell lines. A similar sequence gene in medaka fish, 'B,' encodes a transporter that mediates melanin synthesis. Mutations in this gene are

1406-471: Is a recent admixture of some Negrito groups with their local populations. Archaeogenetics has been used to better understand the populating of the Americas from Asia. Native American mtDNA haplogroups have been estimated to be between 15 and 20 kya, although there is some variation in these estimates. Genetic data has been used to propose various theories regarding how the Americas were colonized. Although

1480-403: Is also difficult due to the lack of repeatability caused by the uniqueness of specimens. Silica-based DNA extraction is a method used as a purification step to extract DNA from archaeological bone artifacts and yield DNA that can be amplified using polymerase chain reaction (PCR) techniques. This process works by using silica as a means to bind DNA and separate it from other components of

1554-411: Is continuously being split up. While the organism is alive these splits are repaired; however, once an organism has died, the DNA will begin to deteriorate without repair. This results in samples having strands of DNA measuring around 100 base pairs in length. Contamination is another significant challenge at multiple steps throughout the process. Often other DNA, such as bacterial DNA, will be present in

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1628-421: Is difficult because the bone fossilisation degrades and DNA is chemically modified, usually by bacteria and fungi in the soil. The best time to extract DNA from a fossil is when it is freshly out of the ground as it contains six times the DNA when compared to stored bones. The temperature of extraction site also affects the amount of obtainable DNA, evident by a decrease in success rate for DNA amplification if

1702-555: Is especially helpful when the morphology of the fossil is ambiguous. Apart from that, species identification can also be done by finding specific genetic markers in an aDNA sequence. For example, the American indigenous population is characterized by specific mitochondrial RFLPs and deletions defined by Wallace et al. aDNA comparison study can also reveal the evolutionary relationship between two species. The number of base differences between DNA of an ancient species and that of

1776-556: Is genetic evidence that Chad-speaking descendants of Nilo-Saharan speakers migrated from Sudan to Lake Chad about 8 kya. Genetic evidence has also indicated that non-African populations made significant contributions to the African gene pool. For example, the Saharan African Beja people have high levels of Middle-Eastern as well as East African Cushitic DNA. Analysis of mtDNA shows that modern humans occupied Eurasia in

1850-592: Is native to India. Analysis of mtDNA and NRY (non-recombining region of Y chromosome) sequences have indicated that the first major dispersal out of Africa went through Saudi Arabia and the Indian coast 50–100 kya, and a second major dispersal occurred 15–50 kya north of the Himalayas. Much work has been done to discover the extent of north-to-south and south-to-north migrations within Eastern Asia. Comparing

1924-468: Is that it requires overlapping primer pairs for ancient DNA due to the short sequences. There can also be “jumping PCR” which causes recombination during the PCR process which can make analyzing the DNA more difficult in inhomogeneous samples. DNA extracted from fossil remains is primarily sequenced using Massive parallel sequencing , which allows simultaneous amplification and sequencing of all DNA segments in

1998-728: Is through DNA hybridization . Single-stranded DNA segments of both species are allowed to form complementary pair bonding with each other. More closely related species have a more similar genetic makeup, and thus a stronger hybridization signal. Scholz et al. conducted southern blot hybridization on Neanderthal aDNA (extracted from fossil remain W-NW and Krapina). The results showed weak ancient human-Neanderthal hybridization and strong ancient human-modern human hybridization. The human-chimpanzee and neanderthal-chimpanzee hybridization are of similarly weak strength. This suggests that humans and neanderthals are not as closely related as two individuals of

2072-577: Is used over mitochondrial and chloroplast DNA because of its faster mutation rate as well as its intraspecific variation due to a higher consistency of polymorphism genetic markers . Findings in crop 'domestication genes' (traits that were specifically selected for or against) include Through the study of archaeogenetics in plant domestication, signs of the first global economy can also be uncovered. The geographical distribution of new crops highly selected in one region found in another where it would have not originally been introduced serve as evidence of

2146-480: The Holocene period. Mathieson et al. (2015) also reported: "A second surprise is that, unlike closely related western hunter-gatherers, the Motala samples have predominantly derived pigmentation alleles at SLC45A2 and SLC24A5." The study by Günther et al. (2018) further discovered that SHGs "show a combination of eye color varying from blue to light brown and light skin pigmentation . This is strikingly different from

2220-819: The Mesolithic . The two other groups were WHGs and eastern hunter-gatherers (EHG). EHGs were found to be an ANE-derived population with significant admixture from a WHG-like source. SHGs formed a distinct cluster between WHG and EHG, and the admixture model proposed by Lazaridis et al. could be successfully replaced with a model that takes EHG as source population for the ANE-like ancestry, with an admixture ratio of ~65% (WHG) : ~35% (EHG). SHGs living between 6000 BC and 3000 BC were found to largely be genetically homogeneous, with little admixture occurring among them during this period. EHGs were found to be more closely related to SHGs than WHGs. Mathieson et al. (2015) subjected

2294-458: The WHGs —who have been suggested to have the specific combination of blue eyes and dark skin and EHGs —who have been suggested to be brown-eyed and light-skinned". Four SHGs from the study yielded diverse eye and hair pigmentation predictions: one individual (SF12) was predicted to be most likely to have had dark hair and blue eyes; a second individual (Hum2) most likely had dark hair and brown eyes;

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2368-430: The 1950s. During the 1940s, Boyd and Karl O. Renkonen independently discovered that lectins react differently to various blood types, after finding that the crude extracts of the lima bean and tufted vetch agglutinated the red blood cells from blood type A but not blood types B or O. This ultimately led to the disclosure of thousands of plants that contained these proteins. In order to examine racial differences and

2442-528: The Altai Mountains of Siberia between 17.2 and 10.1 kya, after the LGM. Analysis of both mtDNA and Y-chromosome DNA reveals evidence of “small, founding populations.” Studying haplogroups has led some scientists to conclude that a southern migration into the Americas from one small population was impossible, although separate analysis has found that such a model is feasible if such a migration happened along

2516-465: The DNA into two single strands at high temperatures. Annealing involves attaching primer strands of DNA to the single strands that allow Taq polymerase to attach to the DNA. Extension occurs when Taq polymerase is added to the sample and matches base pairs to turn the two single strands into two complete double strands. This process is repeated many times, and is usually repeated a higher number of times when used with ancient DNA . Some issues with PCR

2590-511: The Greek word arkhaios , meaning "ancient", and the term genetics , meaning "the study of heredity". The term archaeogenetics was conceived by archaeologist Colin Renfrew . In February 2021, scientists reported the oldest DNA ever sequenced was successfully retrieved from a mammoth dating back over a million years. Ludwik Hirszfeld was a Polish microbiologist and serologist who

2664-539: The Neolithic. Most mtDNA's were “already established” among existing Mesolithic and Paleolithic groups. Most “control-region lineages” of modern European mtDNA are traced to a founder event of reoccupying northern Europe towards the end of the Last Glacial Maximum (LGM). One study of extant European mtDNA's suggest this reoccupation occurred after the end of the LGM, although another suggests it occurred before. Analysis of haplogroups V, H, and U5 support

2738-664: The PWC. Scandinavian hunter-gatherers (SHG) were identified as a distinct ancestral component by Lazaridis et al. (2014). A number of remains examined at Motala , Sweden, and a separate group of remains from 5,000 year-old hunter-gatherers of the Pitted Ware culture (PWC), were identified as belonging to SHG. The study found that an SHG individual from Motala ('Motala12') could be successfully modelled as being of c. 81% western hunter-gatherer (WHG) ancestry, and c. 19% Ancient North Eurasian (ANE) ancestry. Haak et al. (2015) examined

2812-483: The Scandinavian Hunter Gatherers sampled, but only one individual had exclusively light-skin variants of two different SNPs . The study found that depigmentation variants of genes for light skin pigmentation (SLC24A5, SLC45A2) and blue eye pigmentation (OCA2/HERC2) are found at high frequency in SHGs relative to WHGs and EHGs, which the study suggests cannot be explained simply as a result of

2886-524: The Y-chromosome lineages indicate that primarily males partook in these migrations. The discovery of two subbranches U2i and U2e of the U mtDNA lineage, which arose in Central Asia has “modulated” views of a large migration from Central Asia into India, as the two branches diverged 50 kya. Furthermore, U2e is found in large percentages in Europe but not India, and vice versa for U2i, implying U2i

2960-492: The admixture of WHGs and EHGs. The study argues that these allele frequencies must have continued to increase in SHGs after admixture, which was probably caused by environmental adaptation to high latitudes. On the basis of archaeological and genetic evidence, the Swedish archaeologist Oscar D. Nilsson has made forensic reconstructions of both male and female SHGs. Archaeogenetics Archaeogenetics receives its name from

3034-414: The chemical composition of bone and soil, and hydrology . There are three perseveration diagenetic phases. The first phase is bacterial putrefaction , which is estimated to cause a 15-fold degradation of DNA. Phase 2 is when bone chemically degrades, mostly by depurination . The third diagenetic phase occurs after the fossil is excavated and stored, in which bone DNA degradation occurs most rapidly. Once

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3108-455: The coasts. Finally, archaeogenetics has been used to study the occupation of Australia and New Guinea. The Indigenous people of Australia and New Guinea are phenotypically very similar, but mtDNA has shown that this is due to convergence from living in similar conditions. Non-coding regions of mt-DNA have shown “no similarities” between the aboriginal populations of Australia and New Guinea. Furthermore, no major NRY lineages are shared between

3182-601: The continent found 14 genetic and linguistic “clusters,” suggesting an ancient geographic structure to African populations. In general, genotypic and phenotypic analysis have shown “large and subdivided throughout much of their evolutionary history.” Genetic analysis has supported archaeological hypotheses of a large-scale migrations of Bantu speakers into Southern Africa approximately 5 kya. Microsatellite DNA, single nucleotide polymorphisms (SNPs), and insertion/deletion polymorphisms (INDELS) have shown that Nilo-Saharan speaking populations originate from Sudan. Furthermore, there

3256-735: The derived variant of EDAR -V370A. This variant is typical of modern East Asian populations, and is known to affect dental morphology and hair texture, and also chin protrusion and ear morphology, as well as other facial features. The authors did not detect East Asian ancestry in the Scandinavian Hunter Gatherers, and speculated that this gene might not have originated in East Asia, as is commonly believed. However, more recent research incorporating ancient Northeast Asian samples has confirmed that EDAR-V370A originated in Northeast Asia, and spread to West Eurasian populations such as Motala in

3330-415: The development of domestication of dogs. Genetic studies have shown that all dogs are descendants from the gray wolf, however, it is currently unknown when, where, and how many times dogs were domesticated. Some genetic studies have indicated multiple domestications while others have not. Archaeological findings help better understand this complicated past by providing solid evidence about the progression of

3404-542: The distribution and migration patterns of various racial groups, Boyd systematically collected and classified blood samples from around the world, leading to his discovery that blood groups are not influenced by the environment, and are inherited. In his book Genetics and the Races of Man (1950), Boyd categorized the world population into 13 distinct races, based on their different blood type profiles and his idea that human races are populations with differing alleles . One of

3478-772: The domestication of dogs. As early humans domesticated dogs the archaeological remains of buried dogs became increasingly more abundant. Not only does this provide more opportunities for archaeologists to study the remains, it also provides clues about early human culture. [REDACTED] Evolutionary biology portal [REDACTED] History portal SLC45A2 51151 22293 ENSG00000281919 ENSG00000164175 ENSMUSG00000022243 Q9UMX9 P58355 NM_001012509 NM_001297417 NM_016180 NM_053077 NP_001012527 NP_001284346 NP_057264 NP_444307 Membrane-associated transporter protein ( MATP ), also known as solute carrier family 45 member 2 ( SLC45A2 ) or melanoma antigen AIM1 ,

3552-672: The eastern Baltic also carried high frequencies of the HERC2 allele, and increased frequencies of the SLC45A2 and SLC24A5 alleles. They however harbored less EHG ancestry than SHGs. Genetic continuity between the SHGs and the Pitted Ware culture of the Neolithic was detected. The results further underpinned previous suggestion that SHGs were descended from northward migration of WHGs and a subsequent southward migration of EHGs. A certain degree of continuity between SHGs and northern Europeans

3626-490: The existing data on blood group gene frequencies, and largely contributing to the genetic map of the world through his investigation of blood groups in many populations. Mourant discovered the new blood group antigens of the Lewis , Henshaw , Kell , and Rhesus systems, and analyzed the association of blood groups and various other diseases. He also focused on the biological significance of polymorphisms . His work provided

3700-416: The fossil is found in warmer regions. A drastic change of a fossil's environment also affects DNA preservation. Since excavation causes an abrupt change in the fossil's environment, it may lead to physiochemical change in the DNA molecule. Moreover, DNA preservation is also affected by other factors such as the treatment of the unearthed fossil like (e.g. washing, brushing and sun drying), pH , irradiation ,

3774-433: The fossil process that inhibit PCR amplification. However, silica itself is also a strong PCR inhibitor , so careful measures must be taken to ensure that silica is removed from the DNA after extraction. The general process for extracting DNA using the silica-based method is outlined by the following: One of the main advantages of silica-based DNA extraction is that it is relatively quick and efficient, requiring only

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3848-422: The foundation for archaeogenetics because it facilitated the separation of genetic evidence for biological relationships between people. This genetic evidence was previously used for that purpose. It also provided material that could be used to appraise the theories of population genetics . William Boyd was an American immunochemist and biochemist who became famous for his research on the genetics of race in

3922-517: The genetic diversity of northeastern groups with southeastern groups has allowed archaeologists to conclude many of the northeast Asian groups came from the southeast. The Pan-Asian SNP (single nucleotide polymorphism) study found “a strong and highly significant correlation between haplotype diversity and latitude,” which, when coupled with demographic analysis, supports the case for a primarily south-to-north occupation of East Asia. Archaeogenetics has also been used to study hunter-gatherer populations in

3996-403: The hair color and blood type had no correlation. In addition to that he observed that there was a decrease of blood group A from western Europe to India and the opposite for blood group B. He hypothesized that the east-to-west blood group ratio stemmed from two blood groups consisting of mainly A or B mutating from blood group O, and mixing through migration or intermingling. A majority of his work

4070-497: The identification of ancestors for domesticated animals. The information gained from genetics studies on current populations helps guide the Archaeologist's search for documenting these ancestors. Archaeogenetics has been used to trace the domestication of pigs throughout the old world. These studies also reveal evidence about the details of early farmers. Methods of Archaeogenetics have also been used to further understand

4144-443: The major early corridor for geographical dispersal of modern humans from out-of-Africa. Based on studies of mtDNA line M, some have suggested that the first occupants of India were Austro-Asiatic speakers who entered about 45–60 kya. The Indian gene pool has contributions from earliest settlers, as well as West Asian and Central Asian populations from migrations no earlier than 8 kya. The lack of variation in mtDNA lineages compared to

4218-545: The most abundant information sources regarding inheritable traits linked to race remains the study of blood groups. Fossil retrieval starts with selecting an excavation site . Potential excavation sites are usually identified with the mineralogy of the location and visual detection of bones in the area. However, there are more ways to discover excavation zones using technology such as field portable x-ray fluorescence and Dense Stereo Reconstruction. Tools used include knives , brushes , and pointed trowels which assist in

4292-463: The most widely held theory suggests “three waves” of migration after the LGM through the Bering Strait, genetic data have given rise to alternative hypotheses. For example, one hypothesis proposes a migration from Siberia to South America 20–15 kya and a second migration that occurred after glacial recession. Y-chromosome data has led some to hold that there was a single migration starting from

4366-461: The north along the Norwegian coast. During the Neolithic , they admixed further with Early European Farmers (EEFs) and Western Steppe Herders (WSHs). Genetic continuity has been detected between the SHGs and members of the Pitted Ware culture (PWC), and to a certain degree, between SHGs and modern northern Europeans. The Sámi , on the other hand, have been found to be completely unrelated to

4440-428: The original sample. To avoid contamination it is necessary to take many precautions such as separate ventilation systems and workspaces for ancient DNA extraction work. The best samples to use are fresh fossils as uncareful washing can lead to mold growth. DNA coming from fossils also occasionally contains a compound that inhibits DNA replication. Coming to a consensus on which methods are best at mitigating challenges

4514-627: The presence of the protein TMEM131 among SHGs and modern Northern Europeans was detected. This protein may be involved in long-term adaptation to the cold. In a genetic study published in Nature Communications in January 2018, the remains of an SHG female at Motala, Sweden between 5750 BC and 5650 BC was analyzed. She was found to be carrying U5a2d and "substantial ANE ancestry". The study found that Mesolithic hunter-gatherers of

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4588-790: The region, such as the Ainu from Japan and Negrito groups in the Philippines. For example, the Pan-Asian SNP study found that Negrito populations in Malaysia and the Negrito populations in the Philippines were more closely related to non-Negrito local populations than to each other, suggesting Negrito and non-Negrito populations are linked by one entry event into East Asia; although other Negrito groups do share affinities, including with Indigenous Australians . A possible explanation of this

4662-440: The remains of seven SHGs. All three samples of Y-DNA extracted belonged to subclades of I2 . With respects to mtDNA, four samples belonged to U5a1 haplotypes, while three samples belonged U4a2 haplotypes. All samples from western and northern Scandinavia carried U5a1 haplotypes, while all the samples from eastern Scandinavia except from one carried U4a2 haplotypes. The authors of the study suggested that SHGs were descended from

4736-402: The remains of six SHGs buried at Motala between ca. 6000 BC and 5700 BC. Of the four males surveyed, three carried the paternal haplogroup I2a1 or various subclades of it, while the other carried I2c . With regard to mtDNA , four individuals carried subclades of U5a , while two carried U2e1 . The study found SHGs to constitute one of the three main hunter-gatherer populations of Europe during

4810-608: The removal of fossils from the earth. To avoid contaminating the ancient DNA , specimens are handled with gloves and stored in -20 °C immediately after being unearthed. Ensuring that the fossil sample is analyzed in a lab that has not been used for other DNA analysis could prevent contamination as well. Bones are milled to a powder and treated with a solution before the polymerase chain reaction (PCR) process. Samples for DNA amplification may not necessarily be fossil bones. Preserved skin, salt-preserved or air-dried, can also be used in certain situations. DNA preservation

4884-505: The same species are, but they are more related to each other than to chimpanzees. There have also been some attempts to decipher aDNA to provide valuable phenotypic information of ancient species. This is always done by mapping aDNA sequence onto the karyotype of a well-studied closely related species, which share a lot of similar phenotypic traits. For example, Green et al. compared the aDNA sequence from Neanderthal Vi-80 fossil with modern human X and Y chromosome sequence, and they found

4958-752: The six SHGs from Motala to further analysis. SHGs appeared to have persisted in Scandinavia until after 5,000 years ago. The Motala SHGs were found to be closely related to WHGs. Lazaridis et al. (2016) confirmed SHGs to be a mix of EHGs (~43%) and WHGs (~57%). WHGs were modeled as descendants of the Upper Paleolithic people ( Cro-Magnon ) of the Grotte du Bichon in Switzerland with minor additional EHG admixture (~7%). EHGs derived c. 75% of their ancestry from ANEs. Günther et al. (2018) examined

5032-606: The splitting event between the two groups was over 50 kya, casting doubt on recent common ancestry between the two. Archaeogenetics has been used to understand the development of domestication of plants and animals. The combination of genetics and archeological findings have been used to trace the earliest signs of plant domestication around the world. However, since the nuclear, mitochondrial, and chloroplast genomes used to trace domestication's moment of origin have evolved at different rates, its use to trace genealogy have been somewhat problematic. Nuclear DNA in specific

5106-483: The two populations. The high frequency of a single NRY lineage unique to Australia coupled with “low diversity of lineage-associated Y-chromosomal short tandem repeat (Y-STR) haplotypes” provide evidence for a “recent founder or bottleneck” event in Australia. But there is relatively large variation in mtDNA, which would imply that the bottleneck effect impacted males primarily. Together, NRY and mtDNA studies show that

5180-401: Was a massive influx of Near Eastern populations into Europe at the start of the Neolithic. This view led him “to strongly emphasize the expanding early farmers at the expense of the indigenous Mesolithic foraging populations.” mtDNA analysis in the 1990s, however, contradicted this view. M.B. Richards estimated that 10–22% of extant European mtDNA's had come from Near Eastern populations during

5254-785: Was detected. A study published in Nature in February 2018 included an analysis of a large number of individuals of prehistoric Eastern Europe. Thirty-seven samples were collected from Mesolithic and Neolithic Ukraine (9500–6000 BC). These were determined to be an intermediate between EHG and SHG. Samples of Y-DNA extracted from these individuals belonged exclusively to R haplotypes (particularly subclades of R1b1 and R1a )) and I haplotypes (particularly subclades of I2 ). mtDNA belonged almost exclusively to U (particularly subclades of U5 and U4 ). According to Mathieson et al. (2015), 50% of Scandinavian Hunter Gatherers from Motala carried

5328-510: Was found to be powerful in analyses of aDNA because it avoids potential loss of sample, substrate competition for templates, and error propagation in replication. The most common way to analyze an aDNA sequence is to compare it with a known sequence from other sources, and this could be done in different ways for different purposes. The identity of the fossil remain can be uncovered by comparing its DNA sequence with those of known species using software such as BLASTN. This archaeogenetic approach

5402-480: Was researching the links of blood types to sex, disease, climate, age, social class, and race. His work led him to discover that peptic ulcer was more dominant in blood group O, and that AB blood type mothers had a high male-to-female birth ratio. Arthur Mourant was a British hematologist and chemist . He received many awards, most notably Fellowship of the Royal Society . His work included organizing

5476-728: Was the President of the Blood Group Section of the Second International Congress of Blood Transfusion. He founded blood group inheritance with Erich von Dungern in 1910, and contributed to it greatly throughout his life. He studied ABO blood groups . In one of his studies in 1919, Hirszfeld documented the ABO blood groups and hair color of people at the Macedonian front, leading to his discovery that

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