在两个巴西印第安人部落中发现了不寻常的HLA-B基因
M P Belich1, J A Madrigal, W H Hildebrand
1Department of Cell Biology, Stanford University, California 94305.
Nature
|May 28, 1992
概括
南美印第安人部落,Kaingang和瓜拉尼人,表现出独特的人类白细胞抗原 (HLA) B等位基因序列. 自从它们从亚洲迁移以来,这种独特的遗传特征是通过重组而不是突变而演变的.
科学领域:
- 人口遗传学 人口遗传学
- 免疫遗传学 免疫遗传学
- 人类进化研究 人类进化研究
背景情况:
- 印第安人群,包括巴西南部的Kaingang和Guarani,表现出有限的人类白细胞抗原 (HLA) 多态性.
- 这种遗传特征很可能是来自亚洲向美洲迁移的小创始人群体的后果 11,00040,000年前.
研究的目的:
- 在Kaingang和瓜拉尼人群中研究人类白细胞抗原 (HLA) B等位基因的核酸序列.
- 将这些序列与其他全球种群中发现的序列进行比较,并了解南美HLA-B的进化轨迹.
主要方法:
- 从Kaingang和瓜拉尼人群中分析人类白细胞抗原 (HLA) B等位基因的核酸序列.
- 对HLA-B,HLA-A和HLA-C等位基因序列的比较分析与高加索,东方和其他族群的现有数据库进行比较.
主要成果:
- 凯族和瓜拉尼族的人类白细胞抗原 (HLA) -B等位基因与高加索,东方和其他研究群体中发现的不同.
- 相比之下,它们的人类白细胞抗原 (HLA) -A和HLA-C等位基因与其他组中观察到的基因基因相似.
- 证据表明,南美洲的人类白细胞抗原 (HLA) -B进化涉及先前存在的等位基因之间的重组,导致部落特异性的多样化.
结论:
- 人类白细胞抗原 (HLA) -B等位基因的显著演变自从他们最初迁移以来,在南美印第安人部落中发生了.
- 在这些人群中,人类白细胞抗原 (HLA) -B等位基因的多样化主要是由重组驱动的,而不是点突变.
- 这项研究突出了南美土著人口与他们的免疫系统有关的独特的遗传适应和进化途径.
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