The genomes of a monogenic fly: views of primitive sex chromosomes.

Autor: Andere AA; Department of Biology, Indiana University- Purdue University Indianapolis, Indianapolis, IN, USA., Pimsler ML; Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, USA., Tarone AM; Department of Entomology, Texas A&M University, College Station, TX, USA., Picard CJ; Department of Biology, Indiana University- Purdue University Indianapolis, Indianapolis, IN, USA. cpicard@iupui.edu.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2020 Sep 25; Vol. 10 (1), pp. 15728. Date of Electronic Publication: 2020 Sep 25.
DOI: 10.1038/s41598-020-72880-0
Abstrakt: The production of male and female offspring is often determined by the presence of specific sex chromosomes which control sex-specific expression, and sex chromosomes evolve through reduced recombination and specialized gene content. Here we present the genomes of Chrysomya rufifacies, a monogenic blow fly (females produce female or male offspring, exclusively) by separately sequencing and assembling each type of female and the male. The genomes (> 25X coverage) do not appear to have any sex-linked Muller F elements (typical for many Diptera) and exhibit little differentiation between groups supporting the morphological assessments of C. rufifacies homomorphic chromosomes. Males in this species are associated with a unimodal coverage distribution while females exhibit bimodal coverage distributions, suggesting a potential difference in genomic architecture. The presence of the individual-sex draft genomes herein provides new clues regarding the origination and evolution of the diverse sex-determining mechanisms observed within Diptera. Additional genomic analysis of sex chromosomes and sex-determining genes of other blow flies will allow a refined evolutionary understanding of how flies with a typical X/Y heterogametic amphogeny (male and female offspring in similar ratios) sex determination systems evolved into one with a dominant factor that results in single sex progeny in a chromosomally monomorphic system.
Databáze: MEDLINE
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