Evidence for degeneration of the Y chromosome in the dioecious plant Silene latifolia.

Détails

ID Serval
serval:BIB_AF81CAB28AB7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Evidence for degeneration of the Y chromosome in the dioecious plant Silene latifolia.
Périodique
Current Biology
Auteur(s)
Marais G.A., Nicolas M., Bergero R., Chambrier P., Kejnovsky E., Monéger F., Hobza R., Widmer A., Charlesworth D.
ISSN
0960-9822
Statut éditorial
Publié
Date de publication
04/2008
Peer-reviewed
Oui
Volume
18
Numéro
7
Pages
545-549
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't - Publication Status: ppublish
Résumé
The human Y--probably because of its nonrecombining nature--has lost 97% of its genes since X and Y chromosomes started to diverge [1, 2]. There are clear signs of degeneration in the Drosophila miranda neoY chromosome (an autosome fused to the Y chromosome), with neoY genes showing faster protein evolution [3-6], accumulation of unpreferred codons [6], more insertions of transposable elements [5, 7], and lower levels of expression [8] than neoX genes. In the many other taxa with sex chromosomes, Y degeneration has hardly been studied. In plants, many genes are expressed in pollen [9], and strong pollen selection may oppose the degeneration of plant Y chromosomes [10]. Silene latifolia is a dioecious plant with young heteromorphic sex chromosomes [11, 12]. Here we test whether the S. latifolia Y chromosome is undergoing genetic degeneration by analyzing seven sex-linked genes. S. latifolia Y-linked genes tend to evolve faster at the protein level than their X-linked homologs, and they have lower expression levels. Several Y gene introns have increased in length, with evidence for transposable-element accumulation. We detect signs of degeneration in most of the Y-linked gene sequences analyzed, similar to those of animal Y-linked and neo-Y chromosome genes.
Mots-clé
Animals, Chromosomes, Plant, DNA Transposable Elements, Evolution, Molecular, Gene Expression, Genes, Plant, Introns, Silene/genetics, Y Chromosome
Pubmed
Open Access
Oui
Création de la notice
13/03/2008 8:18
Dernière modification de la notice
20/08/2019 16:18
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