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Cross-Species Y Chromosome Function Between Malaria Vectors of the Anopheles gambiae Species Complex.

Abstract：

:Y chromosome function, structure and evolution is poorly understood in many species, including the Anopheles genus of mosquitoes-an emerging model system for studying speciation that also represents the major vectors of malaria. While the Anopheline Y had previously been implicated in male mating behavior, recent data from the Anopheles gambiae complex suggests that, apart from the putative primary sex-determiner, no other genes are conserved on the Y. Studying the functional basis of the evolutionary divergence of the Y chromosome in the gambiae complex is complicated by complete F1 male hybrid sterility. Here, we used an F1 × F0 crossing scheme to overcome a severe bottleneck of male hybrid incompatibilities that enabled us to experimentally purify a genetically labeled A. gambiae Y chromosome in an A. arabiensis background. Whole genome sequencing (WGS) confirmed that the A. gambiae Y retained its original sequence content in the A. arabiensis genomic background. In contrast to comparable experiments in Drosophila, we find that the presence of a heterospecific Y chromosome has no significant effect on the expression of A. arabiensis genes, and transcriptional differences can be explained almost exclusively as a direct consequence of transcripts arising from sequence elements present on the A. gambiae Y chromosome itself. We find that Y hybrids show no obvious fertility defects, and no substantial reduction in male competitiveness. Our results demonstrate that, despite their radically different structure, Y chromosomes of these two species of the gambiae complex that diverged an estimated 1.85 MYA function interchangeably, thus indicating that the Y chromosome does not harbor loci contributing to hybrid incompatibility. Therefore, Y chromosome gene flow between members of the gambiae complex is possible even at their current level of divergence. Importantly, this also suggests that malaria control interventions based on sex-distorting Y drive would be transferable, whether intentionally or contingent, between the major malaria vector species.

journal_name

Genetics

journal_title

Genetics

authors

Bernardini F,Galizi R,Wunderlich M,Taxiarchi C,Kranjc N,Kyrou K,Hammond A,Nolan T,Lawniczak MNK,Papathanos PA,Crisanti A,Windbichler N

doi

10.1534/genetics.117.300221

subject

Has Abstract

pub_date

2017-10-01 00:00:00

pages

729-740

issue

eissn

0016-6731

issn

1943-2631

pii

genetics.117.300221

journal_volume

207

pub_type

杂志文章

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Cross-Species Y Chromosome Function Between Malaria Vectors of the Anopheles gambiae Species Complex.