Foto av Hanna Sigeman

Hanna Sigeman

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Personlig profil

Forskning

I study the evolution of sex chromosomes in birds using genomic approaches. My study system is Sylvioidea songbirds, a superfamily consisting of over a thousand different species, where our research group has detected a neo-sex chromosome.

The unique mode of inheritance and sex-specific evolutionary pressures of sex chromosomes have sparked scientific interest since their discovery. Apart from their central role in sex determination, sex chromosomes are being researched for their involvement in sexual conflicts, dimorphism, speciation and chromosome evolution. The evolutionary trajectory of most sex chromosome systems include degeneration and gene loss of the sex-limited chromosome. These are complicating factors when studying ancient sex chromosome systems such as those in mammals and birds, where over 100 million years of evolution has erased much of the original genetic material.

Studying more recently formed sex chromosomes, like our Sylvioidea neo-sex chromosome, is therefore key for understanding what evolutionary processes are involved in their formation from non-sex determining autosomes. By analysing genome data from multiple species within Sylvioidea songbirds, I want to learn more about how this neo-sex chromosome has evolved in terms of gene content, level of degeneration and sex-biased gene expression.

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Nätverk

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