Wen-Juan Ma Research

Evolutionary Genetics and Comparative Genomics

Organizing ESEB satellite symposium 'The remarkable diversity in the rate and mechanisms of sex chromosome evolution'

We, with Michail Rovatsos, is soon to organise an ESEB satellite Symposium theme on "The remarkable diversity in the rate and mechanisms of sex chromosome evolution“ on Aug. 30-31 and Sep. 01. 2021. The topics include #SexDetermination #SexChromosomes #SexualAntagonisticSelection #SexualConflict #Turnovers etc.

Screen Shot 2021-08-26 at 00.20.12 Read More…

Organizing 2nd AsiaEvo (Asia Evolution) meeting symposium

We, with Masafumi Nozawa, had a nice collection of Symposium theme on "Evolutionary genetics and genomics of sex determination and sex chromosomes“. The topics includes #SexChromosomes #SexDetermination #Genomics #Genetics etc.

Screen Shot 2021-08-26 at 00.13.40Screen Shot 2021-08-26 at 00.13.28 Read More…

New paper on frog sex chromosome diversity and evolution

Glad to share the recent work:

The Diversity and Evolution of Sex Chromosomes in Frogs


Frogs are ideal organisms for studying sex chromosome evolution because of their diversity in sex chromosome differentiation and sex-determination systems. We review 222 anuran frogs, spanning ~220 Myr of divergence, with characterized sex chromosomes, and discuss their evolution, phylogenetic distribution and transitions between homomorphic and heteromorphic states, as well as between sex-determination systems. Most (~75%) anurans have homomorphic sex chromosomes, with XY systems being three times more common than ZW systems. Most remaining anurans (~25%) have heteromorphic sex chromosomes, with XY and ZW systems almost equally represented. There are Y-autosome fusions in 11 species, and no W-/Z-/X-autosome fusions are known. The phylogeny represents at least 19 transitions between sex-determination systems and at least 16 cases of independent evolution of heteromorphic sex chromosomes from homomorphy, the likely ancestral state. Five lineages mostly have heteromorphic sex chromosomes, which might have evolved due to demographic and sexual selection attributes of those lineages. Males do not recombine over most of their genome, regardless of which is the heterogametic sex. Nevertheless, telomere-restricted recombination between ZW chromosomes has evolved at least once. More comparative genomic studies are needed to understand the evolutionary trajectories of sex chromosomes among frog lineages, especially in the ZW systems.

genes-12-00483-g001 Read More…