NDLI: The program of sex chromosome pairing in meiosis is highly conserved across marsupial species: implications for sex chromosome evolution.

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The program of sex chromosome pairing in meiosis is highly conserved across marsupial species: implications for sex chromosome evolution.

Content Provider	Semantic Scholar
Author	Page, Jesús Berríos, Soledad Parra, María Teresa Viera, Alberto Suja, José Angél Priéto, Ignacio Fernández-Donoso, Raúl
Copyright Year	2005
Abstract	Marsupials present a series of genetic and chromosomal features that are highly conserved in very distant species. One of these features is the absence of a homologous region between X and Y chromosomes. According to this genetic differentiation, sex chromosomes do not synapse during the first meiotic prophase in males, and a special structure, the dense plate, maintains sex chromosome association. In this report we present results on the process of meiotic sex chromosome pairing obtained from three different species, Thylamys elegans, Dromiciops gliroides, and Rhyncholestes raphanurus, representing the three orders of American marsupials. We have investigated the relationships between the axial structures organized along sex chromosomes and the formation of the dense plate. We found that in the three species the dense plate arises as a modification of sex chromosomal axial elements, but without the involvement of other meiotic axial structures, such as the cohesin axes. Considering the phylogenetic relationships among the marsupials studied here, our data reinforce the idea that the dense plate emerged early in marsupial evolution as an efficient mechanism to ensure the association of the nonhomologous sex chromosomes. This situation could have influenced the further evolution of sex chromosomes in marsupials.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.genetics.org/content/genetics/170/2/793.full.pdf
PubMed reference number	15802509v1
Volume Number	170
Issue Number	2
Journal	Genetics
Language	English
Access Restriction	Open
Subject Keyword	Chromosome Pairing Genetic Drift Meiosis Mitotic Prophase P1 Bacteriophage Artificial Chromosomes Sex Chromosomes Sex Differentiation Superorder Marsupalia (organism)
Content Type	Text
Resource Type	Article

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