Abstract Detail

Recent Topics Posters

Rifkin, Joanna [1], Beaudry, Felix [2], Humphries, Zoë [3], Barrett, Spencer [3], Wright, Stephen [3].

Possible pericentromeric origin of the Rumex hastatulus sex determining region.

Sex chromosomes are believed to gradually expand the suppression of recombination along their length. However, pre-existing recombination-suppressed regions may also be recruited into sex chromosome function. The species Rumex hastatulus offers powerful tools to explore the evolution of sex chromosomes because of its distinctive polymorphic karyotype: on separate sides of the Mississippi river, it has either an XY sex chromosome system or an XYY system resulting from an X-autosome fusion event. Using linkage mapping, pedigree data, and population genetic sampling, we describe patterns of sex-specific variation and recombination along the Rumex sex chromosome and autosomes. We find evidence that the oldest strata of the ancestral sex chromosome of Rumex hastatulus are in recombination-suppressed pericentromeric regions, and that recombination suppression independent of sex chromosome function may be widespread in the neo sex chromosome.

1 - University of Toronto, Ecology and Evolutionary Biology, 25 Willcocks Street, Toronto, ON, M5S 3B2, Canada
2 - University of Toronto, Ecology and Evolutionary Biology, 25 Willcocks St, Toronto, ON, M5S 3B2, Canada
3 - University of Toronto, 25 Willcocks St, Toronto, ON, M5S 3B2, Canada

Keywords:
sex chromosome
sex determination
recombination.

Presentation Type:
Session: P, Recent Topics Posters
Location: Arizona Ballroom/Starr Pass
Date: Monday, July 29th, 2019
Time: 5:30 PM
Number: PRT020
Abstract ID:1396
Candidate for Awards:None