Evolution of Young Sex Chromosomes in Two Dioecious Sister Plant Species with Distinct Sex Determination Systems

被引:32
作者
Martin, Helene [1 ,2 ]
Carpentier, Fantin [1 ,3 ]
Gallina, Sophie [1 ]
Gode, Cecile [1 ]
Schmitt, Eric [1 ]
Muyle, Aline [4 ,5 ]
Marais, Gabriel A. B. [4 ]
Touzet, Pascal [1 ]
机构
[1] Univ Lille, CNRS, UMR 8198, Evo Eco Paleo, France
[2] Univ Laval, Inst Biol Integrat & Syst, Dept Biol, Quebec City, PQ, Canada
[3] Univ Paris Saclay, Univ Paris Sud, CNRS,AgroParisTech, Ecol Syst Evolut, Orsay, France
[4] Univ Lyon 1, CNRS, UMR 5558, Lab Biometr & Biol Evolut, Villeurbanne, France
[5] Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92717 USA
来源
GENOME BIOLOGY AND EVOLUTION | 2019年 / 11卷 / 02期
关键词
dioecy; female heterogamy; male heterogamy; dosage compensation; Silene otites; Silene pseudotites; DOSAGE-SENSITIVE GENES; REPRODUCTIVE-SYSTEMS; READ ALIGNMENT; COMPENSATION; SILENE; DEGENERATION; MECHANISM; FEMALE; GENERATION; REVERSAL;
D O I
10.1093/gbe/evz001
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
In the last decade, progress has been made in methods to identify the sex determination system in plants. This gives the opportunity to study sex chromosomes that arose independently at different phylogenetic scales, and thus allows the discovery and the understanding of early stages of sex chromosome evolution. In the genus Silene, sex chromosomes have evolved independently in at least two clades from a nondioecious ancestor, the Melandrium and Otites sections. In the latter, sex chromosomes could be younger than in the section Melandrium, based on phylogenetic studies and as no heteromorphic sex chromosomes have been detected. This section might also exhibit lability in sex determination, because male heterogamy and female heterogamy have been suggested to occur. In this study, we investigated the sex determination system of two dioecious species in the section Otites (Silene otites and its close relative Silene pseudotites). Applying the new probabilistic method SEX-DETector on RNA-seq data from cross-controlled progenies, we inferred their most likely sex determination system and a list of putative autosomal and sex-linked contigs. We showed that the two phylogenetically close species differed in their sex determination system (XY versus ZW) with sex chromosomes that derived from two different pairs of autosomes. We built a genetic map of the sex chromosomes and showed that both pairs exhibited a large region with lack of recombination. However, the sex-limited chromosomes exhibited no strong degeneration. Finally, using the ancestral autosomal expression of sex-linked orthologs of nondioecious S. nutans, we found a slight signature of dosage compensation in the heterogametic females of S. otites.
引用
收藏
页码:350 / 361
页数:12
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