Temperature-dependent selection in the transmission of mitochondrial DNA in Drosophila.

Idengaku zasshi Pub Date : 1993-04-01 DOI:10.1266/jjg.68.127
E T Matsuura, Y Niki, S I Chigusa
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引用次数: 24

Abstract

We previously reported a selective mode of mitochondrial DNA (mtDNA) transmission in mtDNA heteroplasmy that was induced artificially in Drosophila melanogaster; the transmission bias appeared to depend on the particular temperature at which heteroplasmic lines were maintained. Here we report investigations of the temperature-dependent mode of mtDNA transmission in heteroplasmic lines for intra- and interspecific combinations maintained separately at 22.5 degrees C, 25 degrees C and 29 degrees C for 20 generations. We have examined a selection model for mitochondrial transmission, similar to genetic selection in haploid organisms. Changes in the relative proportions of two types of mtDNA fit the expectations from the model well. The intensity of selection estimated as a selection coefficient depends on temperature. Temperature-sensitive processes thus appear to be involved in the transmission and maintenance of mitochondria.

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果蝇线粒体DNA传递中的温度依赖性选择。
我们之前报道了在黑腹果蝇中人工诱导的mtDNA异质性中线粒体DNA (mtDNA)传递的选择性模式;透射偏倚似乎取决于维持异质谱线的特定温度。在这里,我们报告了在22.5℃、25℃和29℃分别维持20代的种内和种间组合的异质系中mtDNA传递的温度依赖模式的研究。我们研究了线粒体遗传的选择模型,类似于单倍体生物的遗传选择。两种mtDNA相对比例的变化符合模型的预期。作为选择系数估计的选择强度取决于温度。因此,温度敏感过程似乎与线粒体的传递和维持有关。
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