Evidence for Dosage Compensation in Coccinia grandis, a Plant With a Highly Heteromorphic XY System

Genes

AnjanK. Banerjee¹  Aline Muyle²  Abdelhafid Bendahmane³  David Latrasse³  RaviS. Devani³  Hélène Badouin⁴  Bénédicte Rhoné⁴  Cécile Fruchard⁴  GabrielA.B. Marais⁴  SusanneS. Renner⁵ 

[1] Biology Division, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India;Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, CA 92697, USA;Institute of Plant Sciences Paris Saclay (IPS2), University of Paris Saclay, 91405 Orsay, France;Laboratoire de Biométrie et Biologie Evolutive (LBBE), UMR5558, Université Lyon 1, 69622 Villeurbanne, France;Systematic Botany and Mycology, University of Munich (LMU), Menzinger Str. 67, 80638 Munich, Germany;

关键词: dioecy;    sex chromosomes;    Y degeneration;    sex-biased genes;    cucurbits;   

DOI  :  10.3390/genes11070787

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown