Analysis and evolution of two functional Y-linked loci in a plant sex chromosome system

被引:86
作者
Atanassov, I
Delichère, C
Filatov, DA
Charlesworth, D
Negrutiu, I
Monéger, F
机构
[1] Ecole Normale Super Lyon, Lab Reprod & Dev Plantes, F-69364 Lyon 07, France
[2] Inst Genet Engn, Kostinbrod, Bulgaria
[3] Univ Montpellier 2, Lab Biochim & Physiol Mol Plantes, Montpellier, France
[4] Univ Edinburgh, Inst Cell Anim & Populat Biol, Edinburgh, Midlothian, Scotland
关键词
plant sex chromosomes; dioecy; Silene latifolia; molecular evolution;
D O I
10.1093/oxfordjournals.molbev.a003762
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
White campion (Silene latifolia) is one of the few examples of plants with separate sexes and with X and Y Sex chromosomes. The presence or absence of the Y chromosome determines which type of reproductive organs-male or female-will develop. Recently, we characterized the first active gene located on a plant Y chromosome, SlY1, and its X-linked homolog, SlX1. These genes encode WD-repeat proteins likely to be involved in cell proliferation. Here, we report the characterization of a novel Y-linked gene, SlY4, which also has a homolog on the X chromosome, SlX4. Both SlY4 and SlX4 potentially encode fructose-2,6-bisphosphatases. A comparative molecular analysis of the two sex-linked loci (SlY1/SlX1 and SlY4/SlX4) suggests selective constraint on both X- and Y-linked genes and thus that both X- and Y-linked copies are functional. Divergence between SlY4 and SlX4 is much greater than that between the SlY1 and SlX1 genes. These results suggest that, as for human XY-linked genes, the sex-linked plant loci ceased recombining at different times and reveal distinct events in the evolutionary history of the sex chromosomes.
引用
收藏
页码:2162 / 2168
页数:7
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