Document Type



The results concern a total of 249 individuals from villages in eight areas of the Hidaka District and from the Iburi District of Hokkaido, sampled in 1964 and 1968. Estimates of the amount of Japanese admixture derived from previously obtained Gm results yield values of about 10% and 32% for the Ainu samples. As in previous investigations the findings indicate that the overall distribution of gene frequencies is similar in many respects to that of East Asian Mongoloids. They also confirm the presence of a number of highly distinctive features among the Hidaka Ainu noted in the recent Japanese IBP studies, which include the high frequencies of the NS and cdE (r") complexes, the low frequency of Hp' and the unique occurrence of the haplotype Gm2 '7,21. In addition, the present study indicates a low frequency of the Se and Xg" genes and a high frequency of the acid phosphatase gene P". The detection, independently in the two surveys of the Rh antigen V is a finding not only of anthropological significance, but also of importance for the genetics of the Rhesus system. The results suggest that further research is needed on regional vari­ation of polymorphic traits among Ainu in South Hokkaido, especially those of the Haptoglobin, Acid Phosphatase and Phosphoglucomutase systems, also to confirm the presence of a Gc variant detected in the 1964 samples which was indistinguish­able on immunoelectrophoretic testing from Gc Ab-1 but for which no further tests could be performed due to depletion of the sample.