scholarly journals Evolutionary Strata on the Chicken Z Chromosome: Implications for Sex Chromosome Evolution

Genetics ◽  
2004 ◽  
Vol 167 (1) ◽  
pp. 367-376 ◽  
Author(s):  
Lori-Jayne Lawson Handley ◽  
Helene Ceplitis ◽  
Hans Ellegren
Keyword(s):  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Z Chromosome ◽  
Sex Chromosome Evolution

scholarly journals A Genetic Map of Ostrich Z Chromosome and the Role of Inversions in Avian Sex Chromosome Evolution

2018 ◽  
Vol 10 (8) ◽  
pp. 2049-2060 ◽  
Author(s):  
Homa Papoli Yazdi ◽  
Hans Ellegren
Keyword(s):  
Genetic Map ◽  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Z Chromosome ◽  
Sex Chromosome Evolution

scholarly journals Sex chromosome degeneration, turnover, and sex-biased expression of sex-linked transcripts in African clawed frogs ( Xenopus )

2021 ◽  
Vol 376 (1832) ◽  
pp. 20200095 ◽  
Author(s):  
Xue-Ying Song ◽  
Benjamin L. S. Furman ◽  
Tharindu Premachandra ◽  
Martin Knytl ◽  
Caroline M. S. Cauret ◽  
...  
Keyword(s):  
Sex Chromosomes ◽  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Z Chromosome ◽  
Sex Chromosome Evolution ◽  
Theme Issue ◽  
Recombination Suppression ◽  
Closely Related Species ◽  
African Clawed Frog ◽  
Clawed Frog

The tempo of sex chromosome evolution—how quickly, in what order, why and how their particular characteristics emerge during evolution—remains poorly understood. To understand this further, we studied three closely related species of African clawed frog (genus Xenopus ), that each has independently evolved sex chromosomes. We identified population polymorphism in the extent of sex chromosome differentiation in wild-caught Xenopus borealis that corresponds to a large, previously identified region of recombination suppression. This large sex-linked region of X. borealis has an extreme concentration of genes that encode transcripts with sex-biased expression, and we recovered similar findings in the smaller sex-linked regions of Xenopus laevis and Xenopus tropicalis . In two of these species, strong skews in expression (mostly female-biased in X. borealis , mostly male-biased in X. tropicalis ) are consistent with expectations associated with recombination suppression, and in X. borealis , we hypothesize that a degenerate ancestral Y-chromosome transitioned into its contemporary Z-chromosome. These findings indicate that Xenopus species are tolerant of differences between the sexes in dosage of the products of multiple genes, and offer insights into how evolutionary transformations of ancestral sex chromosomes carry forward to affect the function of new sex chromosomes. This article is part of the theme issue ‘Challenging the paradigm in sex chromosome evolution: empirical and theoretical insights with a focus on vertebrates (Part I)’.

scholarly journals Chromosomal Analysis in Crotophaga ani (Aves, Cuculiformes) Reveals Extensive Genomic Reorganization and an Unusual Z-Autosome Robertsonian Translocation

Cells ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 4
Author(s):  
Rafael Kretschmer ◽  
Ricardo José Gunski ◽  
Analía del Valle Garnero ◽  
Thales Renato Ochotorena de Freitas ◽  
Gustavo Akira Toma ◽  
...  
Keyword(s):  
Robertsonian Translocation ◽  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Rare Event ◽  
Chromosome Morphology ◽  
Z Chromosome ◽  
Molecular Cytogenetic ◽  
Intrachromosomal Rearrangements ◽  
Genomic Reorganization

Although cytogenetics studies in cuckoos (Aves, Cuculiformes) have demonstrated an interesting karyotype variation, such as variations in the chromosome morphology and diploid number, their chromosome organization and evolution, and relation with other birds are poorly understood. Hence, we combined conventional and molecular cytogenetic approaches to investigate chromosome homologies between chicken and the smooth-billed ani (Crotophaga ani). Our results demonstrate extensive chromosome reorganization in C. ani, with interchromosomal rearrangements involving macro and microchromosomes. Intrachromosomal rearrangements were observed in some macrochromosomes, including the Z chromosome. The most evolutionary notable finding was a Robertsonian translocation between the microchromosome 17 and the Z chromosome, a rare event in birds. Additionally, the simple short repeats (SSRs) tested here were preferentially accumulated in the microchromosomes and in the Z and W chromosomes, showing no relationship with the constitutive heterochromatin regions, except in the W chromosome. Taken together, our results suggest that the avian sex chromosome is more complex than previously postulated and revealed the role of microchromosomes in the avian sex chromosome evolution, especially cuckoos.

scholarly journals Sex chromosome evolution: A ‘missing link’ in the evolution of sex chromosomes

Heredity ◽  
2008 ◽  
Vol 102 (3) ◽  
pp. 211-212 ◽  
Author(s):  
R C Moore
Keyword(s):  
Sex Chromosomes ◽  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Sex Chromosome Evolution ◽  
Evolution Of Sex ◽  
Missing Link

scholarly journals Sex and the flower – developmental aspects of sex chromosome evolution

2018 ◽  
Vol 122 (7) ◽  
pp. 1085-1101 ◽  
Author(s):  
Roman Hobza ◽  
Vojtech Hudzieczek ◽  
Zdenek Kubat ◽  
Radim Cegan ◽  
Boris Vyskot ◽  
...  
Keyword(s):  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Sex Chromosome Evolution

Reinforcement in hybrids among once isolated semispecies ofDanaus chrysippus(L.) and evidence for sex chromosome evolution

2010 ◽  
Vol 35 ◽  
pp. 77-89 ◽  
Author(s):  
DAVID A. S. SMITH ◽  
IAN J. GORDON ◽  
JOHN A. ALLEN
Keyword(s):  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Sex Chromosome Evolution
Sign in / Sign up

Export Citation Format

Share Document