In:
Cytogenetic and Genome Research, S. Karger AG, Vol. 152, No. 2 ( 2017), p. 97-104
Abstract:
In the males of Coleoptera, the most frequent sex chromosome constitution is XY. At metaphase I of meiosis, the X and Y are linked by nucleolar proteins, forming the so-called parachute bivalent (Xy 〈 sub 〉 p 〈 /sub 〉 ), which is assumed to allow the non-synapsed X and Y to segregate correctly at anaphase I. However, X0 males are not exceptional, and we explored the relationships between the X and nucleolar proteins in the absence of the Y chromosome in 6 species belonging to different families/subfamilies. Using C-banding and silver staining, we show that nucleolar proteins always remain in contact with the X until anaphase I. These proteins are generally more abundant than in the Xy 〈 sub 〉 p 〈 /sub 〉 bivalent, may remain associated with the NOR during diakinesis, and frequently link the X to 1 or 2 autosomal bivalents, which seem to play the same role as the Y. This role may also be played by B chromosomes, which appear to be more frequent in X0 than in XY males. In conclusion, following Y chromosome loss, various strategies using nucleolar proteins have been developed to facilitate the migration of the unique X at meiotic anaphase I.
Type of Medium:
Online Resource
ISSN:
1424-8581
,
1424-859X
Language:
English
Publisher:
S. Karger AG
Publication Date:
2017
detail.hit.zdb_id:
2061918-2
SSG:
12
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