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Y-DNA haplogroup
 
This article is about the human Y-DNA haplogroup. For the human mtDNA haplogroup, see Human mitochondrial DNA haplogroup.

Human Y-DNA phylogeny and haplogroup distribution.[1] *(a) Phylogenetic tree. 'kya' means 'thousand years ago'. *(b) Geographical distributions of haplogroups are shown in color. *(c) Geographical color legend.
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In human genetics, a human Y-chromosome DNA haplogroup is a haplogroup defined by mutations in the non-recombining portions of DNA from the male-specific Y chromosome (called Y-DNA). Many people within a haplogroup share similar numbers of short tandem repeats (STRs) and types of mutations called single-nucleotide polymorphisms (SNPs).[2]

The human Y-chromosome accumulates roughly two mutations per generation.[3] Y-DNA haplogroups represent major branches of the Y-chromosome phylogenetic tree that share hundreds or even thousands of mutations unique to each haplogroup.

The Y-chromosomal most recent common ancestor (Y-MRCA, informally known as Y-chromosomal Adam) is the most recent common ancestor (MRCA) from whom all currently living humans are descended patrilineally. Y-chromosomal Adam is estimated to have lived roughly 236,000 years ago in Africa[citation needed]. By examining other bottlenecks most Eurasian men (men from populations outside of Africa) are descended from a man who lived in Africa 69,000 years ago (Haplogroup CT). Southeast Asia has been suggested as the origin for all non-African human Y chromosomes,[4] however, this has cited as being unlikely.[5] Other major bottlenecks occurred about 50,000 and 5,000 years ago and subsequently the ancestry of most Eurasian men can be traced back to four ancestors who lived 50,000 years ago, who were descendants of African (E-M168).[6][7][8]

Naming convention

Schematic illustration of Y-DNA haplogroups naming convention. Haplogroups are defined through mutations (SNPs).

Y-DNA haplogroups are defined by the presence of a series of Y-DNA SNP markers. Subclades are defined by a terminal SNP, the SNP furthest down in the Y-chromosome phylogenetic tree.[9][10] The Y Chromosome Consortium (YCC) developed a system of naming major Y-DNA haplogroups with the capital letters A through T, with further subclades named using numbers and lower case letters (YCC longhand nomenclature). YCC shorthand nomenclature names Y-DNA haplogroups and their subclades with the first letter of the major Y-DNA haplogroup followed by a dash and the name of the defining terminal SNP.[11]

Y-DNA haplogroup nomenclature is changing over time to accommodate the increasing number of SNPs being discovered and tested, and the resulting expansion of the Y-chromosome phylogenetic tree. This change in nomenclature has resulted in inconsistent nomenclature being used in different sources.[2] This inconsistency, and increasingly cumbersome longhand nomenclature, has prompted a move toward using the simpler shorthand nomenclature.

Phylogenetic structure

Migration route of Human Y-chromosome DNA haplogroups.
Phylogenetic tree of Y-DNA haplogroups [12]

Y-chromosomal Adam

Major Y-DNA haplogroups

Haplogroups A and B

Haplogroup A is the NRY (non-recombining Y) macrohaplogroup from which all modern paternal haplogroups descend. It is sparsely distributed in Africa, being concentrated among Khoisan populations in the southwest and Nilotic populations toward the northeast in the Nile Valley. BT is a subclade of haplogroup A, more precisely of the A1b clade (A2-T in Cruciani et al. 2011), as follows:

Haplogroup CT (P143)

Main article: Haplogroup CT (Y-DNA)

The defining mutations separating CT (all haplogroups except for A and B) are M168 and M294. The site of origin is likely in Africa. Its age has been estimated at approximately 88,000 years old,[13][14] and more recently at around 100,000[15] or 101,000 years old.[16]

Haplogroup C (M130)

Main article: Haplogroup C (Y-DNA)

Haplogroup D (CTS3946)

Main article: Haplogroup D (Y-DNA)

Haplogroup E (M96)

Main article: Haplogroup E (Y-DNA)

Haplogroup F (M89)

Main article: Haplogroup F (Y-DNA)

The groups descending from haplogroup F are found in some 90% of the world's population, but almost exclusively outside of sub-Saharan Africa.

F xG,H,I,J,K is rare in modern populations and peaks in South Asia, especially Sri Lanka.[12] It also appears to have long been present in South East Asia; it has been reported at rates of 4–5% in Sulawesi and Lembata. One study, which did not comprehensively screen for other subclades of F-M89 (including some subclades of GHIJK), found that Indonesian men with the SNP P14/PF2704 (which is equivalent to M89), comprise 1.8% of men in West Timor, 1.5% of Flores 5.4% of Lembata 2.3% of Sulawesi and 0.2% in Sumatra.[17][18] F* (F xF1,F2,F3) has been reported among 10% of males in Sri Lanka and South India, 5% in Pakistan, as well as lower levels among the Tamang people (Nepal), and in Iran. F1 (P91), F2 (M427) and F3 (M481; previously F5) are all highly rare and virtually exclusive to regions/ethnic minorities in Sri Lanka, India, Nepal, South China, Thailand, Burma, and Vietnam. In such cases, however, the possibility of misidentification is considered to be relatively high and some may belong to misidentified subclades of Haplogroup GHIJK.[19]

Haplogroup G (M201)

Main article: Haplogroup G (Y-DNA)

Haplogroup G (M201) originated some 48,000 years ago and its most recent common ancestor likely lived 26,000 years ago in the Middle East. It spread to Europe with the Neolithic Revolution.

It is found in many ethnic groups in Eurasia; most common in the Caucasus, Iran, Anatolia and the Levant. Found in almost all European countries, but most common in Gagauzia, southeastern Romania, Greece, Italy, Spain, Portugal, Tyrol, and Bohemia with highest concentrations on some Mediterranean islands; uncommon in Northern Europe.[20][21]

G-M201 is also found in small numbers in northwestern China and India, Bangladesh, Pakistan, Sri Lanka, Malaysia, and North Africa.

Haplogroup H (M69)

Main article: Haplogroup H (Y-DNA)

Haplogroup H (M69) probably emerged in Southern Central Asia, South Asia or West Asia, about 48,000 years BP, and remains largely prevalent there in the forms of H1 (M69) and H3 (Z5857). Its sub-clades are also found in lower frequencies in Iran, Central Asia, across the middle-east, and the Arabian peninsula.

However, H2 (P96) is present in Europe since the Neolithic and H1a1 (M82) spread westward in the Medieval era with the migration of the Roma people.

Zdroj:https://en.wikipedia.org?pojem=Y-DNA_haplogroup
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