Fruchard C., Badouin H., Latrasse D., Devani R. S., Muyle A., Rhoné Bénédicte, Renner S. S., Banerjee A. K., Bendahmane A., Marais G. A. B. (2020). Evidence for dosage compensation in Coccinia grandis, a plant with a highly heteromorphic XY system. Genes, 11 (7), p. art. 787 [18 p.].
Titre du document
Evidence for dosage compensation in Coccinia grandis, a plant with a highly heteromorphic XY system
Année de publication
2020
Auteurs
Fruchard C., Badouin H., Latrasse D., Devani R. S., Muyle A., Rhoné Bénédicte, Renner S. S., Banerjee A. K., Bendahmane A., Marais G. A. B.
Source
Genes, 2020,
11 (7), p. art. 787 [18 p.]
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 similar to 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.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Sciences du monde végétal [076]
Localisation
Fonds IRD [F B010079466]
Identifiant IRD
fdi:010079466
