多拷贝基因在苔类植物地钱的Y染色体特异性重复序列中独特地扩增。
Multicopy genes uniquely amplified in the Y chromosome-specific repeats of the liverwort Marchantia polymorpha.
作者信息
Ishizaki Kimitsune, Shimizu-Ueda Yuu, Okada Sachiko, Yamamoto Masayuki, Fujisawa Masaki, Yamato Katsuyuki T, Fukuzawa Hideya, Ohyama Kanji
机构信息
Laboratory of Plant Molecular Biology, Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan.
出版信息
Nucleic Acids Res. 2002 Nov 1;30(21):4675-81. doi: 10.1093/nar/gkf604.
Abstract
Sex of the liverwort Marchantia polymorpha is determined by the sex chromosomes Y and X, in male and female plant, respectively. Approximately half of the Y chromosome is made up of unique repeat sequences. Here, we report that part of the Y chromosome, represented by a 90-kb insert of a genomic clone pMM2D3, contains five putative genes in addition to the ORF162 gene, which is present also within the Y chromosome-specific repeat region. One of the five putative genes shows similarity to a male gamete-specific protein of lily and is expressed predominantly in male sex organs, suggesting that this gene has a male reproductive function. Furthermore, Southern blot analysis revealed that these five putative genes are amplified on the Y chromosome, but they also probably have homologs on the X chromosome and/or autosomes. These observations suggest that the Y chromosome evolved by co-amplifying protein-coding genes with unique repeat sequences.
摘要
苔类植物多歧银叶苔的性别分别由雄性和雌性植株中的性染色体Y和X决定。Y染色体大约一半由独特的重复序列组成。在此，我们报告，以基因组克隆pMM2D3的一个90 kb插入片段为代表的Y染色体部分，除了ORF162基因外还包含五个推定基因，该ORF162基因也存在于Y染色体特异性重复区域内。这五个推定基因之一与百合的雄性配子特异性蛋白相似，并主要在雄性性器官中表达，表明该基因具有雄性生殖功能。此外，Southern印迹分析显示这五个推定基因在Y染色体上扩增，但它们可能在X染色体和/或常染色体上也有同源物。这些观察结果表明，Y染色体是通过将蛋白质编码基因与独特的重复序列共同扩增而进化的。
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