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寄生线虫线粒体DNA中的序列扩增与基因重排

Sequence amplification and gene rearrangement in parasitic nematode mitochondrial DNA.

作者信息

Hyman B C, Beck J L, Weiss K C

机构信息

Department of Biology, University of California, Riverside 92521.

出版信息

Genetics. 1988 Nov;120(3):707-12. doi: 10.1093/genetics/120.3.707.

Abstract

The nematode Romanomermis culicivorax, an obligate mosquito parasite, possesses a 26 kilobase (kb) mitochondrial genome. The unusually large size is due to transcriptionally active DNA sequences present as 3.0 kb direct tandem repeats and as inverted portions of the repeating unit located elsewhere in the mitochondrial DNA (mtDNA). The genome rearrangements involved in establishing this unusual sequence organization may have dramatically altered conventional mitochondrial gene order. Genes for subunits of the cytochrome c oxidase complex (COI and COII) are normally closely linked in animal mtDNAs, but are separated by approximately 8 kb in this mitochondrial genome.

摘要

线虫类的致库蚊罗索线虫(Romanomermis culicivorax)是蚊子的专性寄生虫,拥有一个26千碱基(kb)的线粒体基因组。其异常大的尺寸归因于转录活性DNA序列,这些序列以3.0 kb的直接串联重复形式存在,并作为重复单元的反向部分位于线粒体DNA(mtDNA)的其他位置。建立这种异常序列组织所涉及的基因组重排可能极大地改变了传统的线粒体基因顺序。细胞色素c氧化酶复合体亚基(COI和COII)的基因在动物mtDNA中通常紧密相连,但在这个线粒体基因组中却被大约8 kb的距离隔开。

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Similar evolutionary patterning among repeated and single copy nematode mitochondrial genes.
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