Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/4897
Title: Evidence for Dosage Compensation in Coccinia grandis, a Plant with a Highly Heteromorphic XY System
Authors: Fruchard, Cécile
Badouin, Hélène
Latrasse, David
DEVANI, RAVI SURESH
Muyle, Aline
Rhoné, Bénédicte
Renner, Susanne S.
BANERJEE, ANJAN K.
Bendahmane, Abdelhafid
Marais, Gabriel A. B.
Dept. of Biology
Keywords: Dioecy
Sex chromosomes
Y degeneration
Sex-biased genes
Cucurbits
TOC-JUL-2020
2020
2020-JUL-WEEK4
Issue Date: Jul-2020
Publisher: MDPI
Citation: Genes, 11(7).
Abstract: About 15,000 angiosperms are dioecious, but the mechanisms of sex determination in plants remain poorly understood. In particular, how Y chromosomes evolve and degenerate, and whether dosage compensation evolves as a response, are matters of debate. Here, we focus on Coccinia grandis, a dioecious cucurbit with the highest level of X/Y heteromorphy recorded so far. We identified sex-linked genes using RNA sequences from a cross and a model-based method termed SEX-DETector. Parents and F1 individuals were genotyped, and the transmission patterns of SNPs were then analyzed. In the >1300 sex-linked genes studied, maximum X-Y divergence was 0.13–0.17, and substantial Y degeneration is implied by an average Y/X expression ratio of 0.63 and an inferred gene loss on the Y of ~40%. We also found reduced Y gene expression being compensated by elevated expression of corresponding genes on the X and an excess of sex-biased genes on the sex chromosomes. Molecular evolution of sex-linked genes in C. grandis is thus comparable to that in Silene latifolia, another dioecious plant with a strongly heteromorphic XY system, and cucurbits are the fourth plant family in which dosage compensation is described, suggesting it might be common in plants.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/4897
https://doi.org/10.3390/genes11070787
ISSN: 2073-4425
Appears in Collections:JOURNAL ARTICLES

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