Gene organization of the liverwort Y chromosome reveals distinct sex chromosome evolution in a haploid system
| Autor: | Masataka Kajikawa, Taku Nishide, Sachiko Okada, Kaoru Kono, Mizuki Takenaka, Shigeki Nakayama, Chiaki Kuriyama, Mariko Fujishita, Hiroyuki Nishida, Kimitsune Ishizaki, Megumi Sakaida, Tomoyuki Bando, Akiko Hasumi, Kanji Ohyama, Arata Yamaki, Takashi Yamano, Tsutomu Hanajiri, Axel Brennicke, Ryoko Sakata, Masaki Fujisawa, Yoshito Kohzu, Tadasu Shin-I, Katsuyuki T. Yamato, Yuji Kohara, Hideya Fukuzawa, Hiroki Bando, Takayuki Kohchi, Kohei Yodoya, Kiwako Hayashi, Masayuki Yamamoto, Shohei Yamaoka, Tomohisa Nishio, Seung H. Choi, Yuu Shimizu-Ueda |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Genetics
Expressed Sequence Tags Hepatophyta Multidisciplinary Base Sequence Reverse Transcriptase Polymerase Chain Reaction Molecular Sequence Data Chromosome Mapping Karyotype Sequence Analysis DNA Biology Biological Sciences Haploidy Y chromosome Genes Plant Chromosomes Plant Evolution Molecular Chromosome 15 Chromosome 16 Chromosome 4 Chromosome 19 Chromosome 21 Sex linkage In Situ Hybridization Fluorescence |
| Popis: | Y chromosomes are different from other chromosomes because of a lack of recombination. Until now, complete sequence information of Y chromosomes has been available only for some primates, although considerable information is available for other organisms, e.g., several species of Drosophila . Here, we report the gene organization of the Y chromosome in the dioecious liverwort Marchantia polymorpha and provide a detailed view of a Y chromosome in a haploid organism. On the 10-Mb Y chromosome, 64 genes are identified, 14 of which are detected only in the male genome and are expressed in reproductive organs but not in vegetative thalli, suggesting their participation in male reproductive functions. Another 40 genes on the Y chromosome are expressed in thalli and male sexual organs. At least six of these genes have diverged X-linked counterparts that are in turn expressed in thalli and sexual organs in female plants, suggesting that these X- and Y-linked genes have essential cellular functions. These findings indicate that the Y and X chromosomes share the same ancestral autosome and support the prediction that in a haploid organism essential genes on sex chromosomes are more likely to persist than in a diploid organism. |
| Databáze: | OpenAIRE |
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