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
Institution
Titre
Evidence for degeneration of the Y chromosome in the dioecious plant Silene latifolia.
Périodique
Current Biology
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 7:18
Dernière modification de la notice
20/08/2019 15:18