Genetic and genealogical research of the Itygin family: from documentary reconstruction to DNA genealogical examination

The article deals with the issue of complex genetic and genealogical study of the Khakass Itygin family, to which the famous Khakass statesman and public figure Georgy Ignatievich Itygin (1873 - 1928) belonged. In the XIX century, the family of the Itygins was called "choda khyrgys" and belonged to the Shuisky council of the Kyzyl Steppe Duma. Itygins as part of the Khakass subethnos of the Kyzyl people became Russified as a result of interethnic marriages and settled in neighboring regions. Since the ethnic roots of the Kyzyl people were not touched upon during the population-genetic research of scientists, we decided to fill this gap using the example of DNA testing of specific representatives of the Kyzyl genera. This scientific task required the development of a new interdisciplinary methodology at the junction of classical archival and documentary genealogy as an auxiliary historical discipline and genetic genealogy as a section of ethnogenomics within the framework of biological science. The methodology of complex genetic and genealogical verification of the pedigree involves cross-checking of kinship data, including oral-documentary and genetic reconstruction of the pedigree. Such a study makes it possible to establish the migration of patrilineal ancestors deep into thousands of years, which means to establish the genetic source of a particular genus/ethnos by determining the appropriate branch on the phylogenetic tree of the male population of mankind. From a genetic point of view, we are talking about the study of Y-chromosome markers as a tool for DNA identification and population attribution. Thanks to DNA testing of three male representatives of the Itygin family, it was possible: 1) to certify the autosomal relationship of two cousins – descendants of Itygin from his second marriage; 2) to determine the reference Y-haplogroup of the Itygins as I2a1b2a1a-S17250, which dates the phylogeny and migration of patrilineal ancestors of the genus to the turn of the new era; 3) additional genetic and genealogical verification of the male branch of the Itygins along a parallel line at the level of of the fifth degree, which confirmed the reference Y-haplogroup of the Itygins.