LAUSR

Background：Known for its rich history and culture, Qingdao is a typical symbol of Chinese maritime culture. Its unique genetic landscape aroused interest among geneticists and forensic scientists. However, the genetic landscape of Qingdao has never been uncovered.Aim：This investigation intends to provide light on Qingdao's paternal genetic diversity and its evolutionary connections to other Han subgroups.Subjects and methods：The genetic polymorphisms of 41 Y-chromosomal short tandem repeat (STR) loci in the Qingdao Han were investigated using SureID® PathFinder Plus Kit. Phylogenetic studies were performed using genotype data from 52 East Asian groups at 23 common Y-STR loci. A multidimensional scaling plot and cladogram were constructed. Linear Discriminant Analysis (LDA) was carried out for predicting categories among the Han people. The k-nearest neighbor (kNN) algorithm was utilised to designate Y-SNP haplogroups for each haplotype.Results：The Qingdao Han was genetically far from the Tibeto-Burman populations and was close with the Han people from northern China. LDA indicated a deep integration among the present-day Han people. By the kNN model, the predicted O2a2 and O2a1 were shown to be the predominant Y-SNP haplogroups.Conclusions：This study would be helpful for reconstructing the patrilineal history in China and establishing a more comprehensive Y-STR database.