The Drosophila early ovarian transcriptome provides insight to the molecular causes of recombination rate variation across genomes

BMC Genomics

Research Article

Andrew B Adrian¹  Josep M Comeron² 

[1] Department of Biology, University of Iowa, Iowa City, Iowa, USA;Interdisciplinary Graduate Program in Informatics, University of Iowa, Iowa City, Iowa, USA;Department of Biology, University of Iowa, Iowa City, Iowa, USA;Interdisciplinary Graduate Program in Informatics, University of Iowa, Iowa City, Iowa, USA;Interdisiplinary Graduate Program in Genetics, University of Iowa, Iowa City, Iowa, USA;

关键词: Gene expression;    RNA-seq;    Maternal effect;    Oogenesis;    Germarium;    Crossing-over;    Recombination;   

DOI  :  10.1186/1471-2164-14-794

 received in 2013-08-01, accepted in 2013-11-06,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundEvidence in yeast indicates that gene expression is correlated with recombination activity and double-strand break (DSB) formation in some hotspots. Studies of nucleosome occupancy in yeast and mice also suggest that open chromatin influences the formation of DSBs. In Drosophila melanogaster, high-resolution recombination maps show an excess of DSBs within annotated transcripts relative to intergenic sequences. The impact of active transcription on recombination landscapes, however, remains unexplored in a multicellular organism. We then investigated the transcription profile during early meiosis in D. melanogaster females to obtain a glimpse at the relevant transcriptional dynamics during DSB formation, and test the specific hypothesis that DSBs preferentially target transcriptionally active genomic regions.ResultsOur study of transcript profiles of early- and late-meiosis using mRNA-seq revealed, 1) significant differences in gene expression, 2) new genes and exons, 3) parent-of-origin effects on transcription in early-meiosis stages, and 4) a nonrandom genomic distribution of transcribed genes. Importantly, genomic regions that are more actively transcribed during early meiosis show higher rates of recombination, and we ruled out DSB preference for genic regions that are not transcribed.ConclusionsOur results provide evidence in a multicellular organism that transcription during the initial phases of meiosis increases the likelihood of DSB and give insight into the molecular determinants of recombination rate variation across the D. melanogaster genome. We propose that a model where variation in gene expression plays a role altering the recombination landscape across the genome could provide a molecular, heritable and plastic mechanism to observed patterns of recombination variation, from the high level of intra-specific variation to the known influence of environmental factors and stress conditions.

【 授权许可】

CC BY   
© Adrian and Comeron; licensee BioMed Central Ltd. 2013