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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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