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Title: Evidence of neofunctionalization after the duplication of the highly conserved Polycomb group gene Caf1-55 in the obscura group of Drosophila
Author: Calvo-Martín, J.M.
Papaceit Vidal, Montserrat
Segarra Robert, Carmen
Keywords: Proteïnes
Issue Date: 17-Jan-2017
Publisher: Nature Publishing Group
Abstract: Drosophila CAF1-55 protein is a subunit of the Polycomb repressive complex PRC2 and other protein complexes. It is a multifunctional and evolutionarily conserved protein that participates in nucleosome assembly and remodelling, as well as in the epigenetic regulation of a large set of target genes. Here, we describe and analyze the duplication of Caf1-55 in the obscura group of Drosophila. Paralogs exhibited a strong asymmetry in evolutionary rates, which suggests that they have evolved according to a neofunctionalization process. During this process, the ancestral copy has been kept under steady purifying selection to retain the ancestral function and the derived copy (Caf1-55dup) that originated via a DNA-mediated duplication event ~18 Mya, has been under clear episodic selection. Different maximum likelihood approaches confirmed the action of positive selection, in contrast to relaxed selection, on Caf1-55dup after the duplication. This adaptive process has also taken place more recently during the divergence of D. subobscura and D. guanche. The possible association of this duplication with a previously detected acceleration in the evolutionary rate of three CAF1-55 partners in PRC2 complexes is discussed. Finally, the timing and functional consequences of the Caf1-55 duplication is compared to other duplications of Polycomb genes.
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It is part of: Scientific Reports, 2017, vol. 7, num. 40536, p. 1-10
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ISSN: 2045-2322
Appears in Collections:Articles publicats en revistes (Genètica, Microbiologia i Estadística)

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