Black F L, Salzano F M, Layrisse Z, Franco M H, Harris N S, Weimer T A
Am J Phys Anthropol. 1980 Jan;52(1):119-32. doi: 10.1002/ajpa.1330520115.
Results concerning HLA types and 22 other blood genetic systems are reported for the Parakanã Indians of northern Brazil, a tribe that is notable for the light color and pilosity of some of its members. No clear evidence of Caucasoid admixture was found, but the Parakanã show unusual frequencies in the EsD1, PGM1(1) Gc2, CpB, Fya, Dia, and LM genetic markers. In addition, the very rare Rh allele ry is present, as well as what seems to be a new PGM2 variant. There is very limited heterogeneity in the HLA system. All these distinctive features may have arisen through a combination of founder effects and genetic drift. However, low FIS values, as well as higher mean ages in heterozygous as compared to homozygous persons, suggest that an heterotic effect is counteracting these dispersive forces.
报告了巴西北部帕拉卡纳印第安人的HLA类型及其他22种血液遗传系统的研究结果。该部落以部分成员的浅肤色和多毛而闻名。未发现明显的高加索人混合血统证据，但帕拉卡纳人在EsD1、PGM1(1)、Gc2、CpB、Fya、Dia和LM遗传标记中呈现出异常频率。此外，存在非常罕见的Rh等位基因ry，以及一种似乎是新的PGM2变体。HLA系统中的异质性非常有限。所有这些独特特征可能是由奠基者效应和遗传漂变共同作用产生的。然而，低FIS值以及杂合子个体的平均年龄高于纯合子个体，表明杂种优势效应正在抵消这些分散力。
