scholarly journals The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants

2018 ◽  
Vol 2 (4) ◽  
pp. 368-377 ◽  
Author(s):  
George Sandler ◽  
Felix E. G. Beaudry ◽  
Spencer C. H. Barrett ◽  
Stephen I. Wright
Keyword(s):  
Y Chromosome ◽  
Chromosome Evolution ◽  
Dioecious Plants ◽  
Y Chromosome Evolution ◽  
Haploid Selection

scholarly journals Gene-level, but not chromosome-wide, divergence between a very young house fly proto-Y chromosome and its homologous proto-X chromosome

2020 ◽  
Author(s):  
Jae Hak Son ◽  
Richard P. Meisel
Keyword(s):  
Gene Expression ◽  
Y Chromosome ◽  
Chromosome Evolution ◽  
Sex Chromosome ◽  
House Fly ◽  
Evolutionary Divergence ◽  
Y Chromosomes ◽  
Mitochondrial Functions ◽  
Xx Males ◽  
Y Chromosome Evolution

AbstractX and Y chromosomes are usually derived from a pair of homologous autosomes, which then diverge from each other over time. Although Y-specific features have been characterized in sex chromosomes of various ages, the earliest stages of Y chromosome evolution remain elusive. In particular, we do not know whether early stages of Y chromosome evolution consist of changes to individual genes or happen via chromosome-scale divergence from the X. To address this question, we quantified divergence between young proto-X and proto-Y chromosomes in the house fly, Musca domestica. We compared proto-sex chromosome sequence and gene expression between genotypic (XY) and sex-reversed (XX) males. We find evidence for sequence divergence between genes on the proto-X and proto-Y, including five genes with mitochondrial functions. There is also an excess of genes with divergent expression between the proto-X and proto-Y, but the number of genes is small. This suggests that individual proto-Y genes, but not the entire proto-Y chromosome, have diverged from the proto-X. We identified one gene, encoding an axonemal dynein assembly factor (which functions in sperm motility), that has higher expression in XY males than XX males because of a disproportionate contribution of the proto-Y allele to gene expression. The up-regulation of the proto-Y allele may be favored in males because of this gene’s function in spermatogenesis. The evolutionary divergence between proto-X and proto-Y copies of this gene, as well as the mitochondrial genes, is consistent with selection in males affecting the evolution of individual genes during early Y chromosome evolution.

scholarly journals The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants

2018 ◽  
Author(s):  
George Sandler ◽  
Felix E.G. Beaudry ◽  
Spencer C.H. Barrett ◽  
Stephen I. Wright
Keyword(s):  
Gene Expression ◽  
Y Chromosome ◽  
Sex Chromosomes ◽  
Chromosome Evolution ◽  
Sex Chromosome ◽  
Sex Chromosome Evolution ◽  
Y Chromosomes ◽  
Expression Bias ◽  
Haploid Selection ◽  
Plant Sex

AbstractThe evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution, especially in plants where gene expression in the haploid phase is extensive. In particular, male-specific haploid selection might favour the linkage of pollen beneficial alleles to male sex determining regions on incipient Y chromosomes. This linkage might then allow such alleles to further specialise for the haploid phase. Purifying haploid selection is also expected to slow the degeneration of Y-linked genes expressed in the haploid phase. Here, we examine the evolution of gene expression in flower buds and pollen of two species of Rumex to test for signatures of haploid selection acting during plant sex chromosome evolution. We find that genes with high ancestral pollen expression bias occur more often on sex chromosomes than autosomes and that genes on the Y chromosome are more likely to become enriched for pollen expression bias. We also find that genes with low expression in pollen are more likely to be lost from the Y chromosome. Our results suggest that sex-specific haploid selection during the gametophytic stage of the lifecycle may be a major contributor to several features of plant sex chromosome evolution.

scholarly journals Shared and Species-Specific Patterns of Nascent Y Chromosome Evolution in Two Guppy Species

Genes ◽  
2018 ◽  
Vol 9 (5) ◽  
pp. 238 ◽  
Author(s):  
Jake Morris ◽  
Iulia Darolti ◽  
Natasha Bloch ◽  
Alison Wright ◽  
Judith Mank
Keyword(s):  
Y Chromosome ◽  
Chromosome Evolution ◽  
Y Chromosome Evolution ◽  
Species Specific

Molecular characterization of a mouse Y chromosomal repetitive sequence amplified in distantly related species in the genus Mus

Genome ◽  
1993 ◽  
Vol 36 (3) ◽  
pp. 588-593 ◽  
Author(s):  
Yutaka Nishioka ◽  
Becky M. Dolan ◽  
Laila Zahed
Keyword(s):  
Y Chromosome ◽  
Repetitive Sequence ◽  
Chromosome Evolution ◽  
Fragment Length Polymorphism ◽  
Gc Content ◽  
Y Chromosomes ◽  
Mouse Species ◽  
Y Chromosome Evolution

This report describes a 1.1 kb long mouse Y chromosomal sequence designated 142-4. It has a 42% GC content and is rich in short direct and inverted repeats. 142-4 related sequences are repeated about 200 times in the Mus musculus Y chromosome and their distribution was visualized by in situ hybridization. 142-4 detected a restriction fragment length polymorphism that differentiated between the M. m. musculus type and the M. m. domesticus type Y chromosome. Southern blot analysis of DNAs isolated from a panel of mouse species showed that 142-4 related sequences were amplified in the Y chromosomes of M. minutoides, M. musculus, M. saxicola, M. spicilegus, and M. spretus but not in those of M. caroli, M. cookii, and M. pahari. These results suggest that 142-4 related sequences are evolutionary unstable and their accumulation patterns do not correlate with the known phylogenetic relationships of mouse species in the genus Mus.Key words: mouse Y chromosome, repetitive sequence, Mus, sequence amplification, Y chromosome evolution.

Mitochondrial mutations may drive Y chromosome evolution

BioEssays ◽  
2002 ◽  
Vol 24 (3) ◽  
pp. 275-279 ◽  
Author(s):  
Neil J. Gemmell ◽  
Frank Y. T. Sin
Keyword(s):  
Y Chromosome ◽  
Chromosome Evolution ◽  
Mitochondrial Mutations ◽  
Y Chromosome Evolution
Sign in / Sign up

Export Citation Format

Share Document