Distinguishing the forces controlling genetic variation at the Xdh locus in Drosophila pseudoobscura.

Distinguishing the forces controlling genetic variation at the Xdh locus in Drosophila pseudoobscura.
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区分假暗果蝇 Xdh 基因座遗传变异的控制力。

DOI:
10.1093/genetics/123.2.359
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发表时间:
1989
期刊:
影响因子:
3.3
通讯作者:
Lewontin,RC
Lewontin,RC
中科院分区:
生物学2区
文献类型:
--
作者:
Riley,MA;Hallas,ME;Lewontin,RC

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从加州和哥伦比亚波哥大的两个自然种群中采集了58个等染色体品系,采用四切割酶限制性内切酶图谱进行了分析。一个4.6 kb的区域的黄嘌呤脱氢酶基因座进行了探测和135个限制性内切酶位点得分66多态性。这预示着,如果多态性沿着编码区随机发生,则对于所调查的基因,平均每12个bp在该区域中将是多态的。此外,还有12个插入/缺失多态性。49个不同的单倍型被确认在58行检查。最常见的单倍型频率仅为5%。碱基对杂合性(0.0097)和连锁不平衡的措施,导致预测的种群大小范围为1.2-2.4 × 10(6)的物种。高水平的重组(包括基因转换)可以从数据集中所有四种配子类型的存在中推断出来。
Fifty-eight isochromosomal lines sampled from two natural populations of Drosophila pseudoobscura in California and one from Bogota, Colombia, were examined using four-cutter restriction mapping. A 4.6-kb region of the xanthine dehydrogenase locus was probed and 66 of 135 restriction sites scored were polymorphic. This predicts that on average every 12th bp would be polymorphic in this region for the genes surveyed if polymorphism occurred randomly along the coding region. In addition, there were 12 insertion/deletion polymorphisms. Forty-nine distinct haplotypes were recognized in the 58 lines examined. The most common haplotype obtained a frequency of only 5%. Measures of base pair heterozygosity (0.0097) and linkage disequilibrium lead to a predicted population size in the range of 1.2-2.4 X 10(6) for the species. High levels of recombination (including gene conversion) can be inferred from the presence of all four gametic types in the data set.
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