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Analysis of the Drosophila melanogaster testes transcriptome reveals coordinate regulation of paralogous genes.

ABSTRACT: Gene duplications have been broadly implicated in the generation of testis-specific genes. To perform a comprehensive analysis of paralogous testis-biased genes, we characterized the testes transcriptome of Drosophila melanogaster by comparing gene expression in testes vs. ovaries, heads, and gonadectomized males. A number of the identified 399 testis-biased genes code for the known components of mature sperm. Among the detected 69 genes downregulated in testes, a large fraction is required for viability. By analyzing paralogs of testis-biased genes, we identified "co-regulated" paralogous pairs in which both genes are testis biased, "anti-regulated" pairs in which one paralog is testis biased and the other downregulated in testes, and "neutral" pairs in which one paralog is testis biased and the other constitutively expressed. The numbers of identified co-regulated and anti-regulated pairs were higher than expected by chance. Testis-biased genes included in these pairs show decreased frequency of lethal mutations, suggesting their specific role in male reproduction. These genes also show exceptionally high interspecific variability of expression in comparison between D. melanogaster and the closely related D. simulans. Further, interspecific changes in testis bias of expression are generally correlated within the co-regulated pairs and are anti-correlated within the anti-regulated pairs, suggesting coordinated regulation within both types of paralogous gene pairs.

SUBMITTER: Mikhaylova LM

PROVIDER: S-EPMC2390609 | biostudies-literature | 2008 May

REPOSITORIES: biostudies-literature

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Analysis of the Drosophila melanogaster testes transcriptome reveals coordinate regulation of paralogous genes.

Mikhaylova Lyudmila M LM Nguyen Kimberly K Nurminsky Dmitry I DI

Genetics 20080501 1

Gene duplications have been broadly implicated in the generation of testis-specific genes. To perform a comprehensive analysis of paralogous testis-biased genes, we characterized the testes transcriptome of Drosophila melanogaster by comparing gene expression in testes vs. ovaries, heads, and gonadectomized males. A number of the identified 399 testis-biased genes code for the known components of mature sperm. Among the detected 69 genes downregulated in testes, a large fraction is required for ...[more]

PMID: 18493055

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Project description:BackgroundThe formation of matured and individual sperm involves a series of molecular and spectacular morphological changes of the developing cysts in Drosophila melanogaster testis. Recent advances in RNA Sequencing (RNA-Seq) technology help us to understand the complexity of eukaryotic transcriptomes by dissecting different tissues and developmental stages of organisms. To gain a better understanding of cellular differentiation of spermatogenesis, we applied RNA-Seq to analyse the testis-specific transcriptome, including coding and non-coding genes.ResultsWe isolated three different parts of the wild-type testis by dissecting and cutting the different regions: 1.) the apical region, which contains stem cells and developing spermatocytes 2.) the middle region, with enrichment of meiotic cysts 3.) the basal region, which contains elongated post-meiotic cysts with spermatids. Total RNA was isolated from each region and analysed by next-generation sequencing. We collected data from the annotated 17412 Drosophila genes and identified 5381 genes with significant transcript accumulation differences between the regions, representing the main stages of spermatogenesis. We demonstrated for the first time the presence and region specific distribution of 2061 lncRNAs in testis, with 203 significant differences. Using the available modENCODE RNA-Seq data, we determined the tissue specificity indices of Drosophila genes. Combining the indices with our results, we identified genes with region-specific enrichment in testis.ConclusionBy multiple analyses of our results and integrating existing knowledge about Drosophila melanogaster spermatogenesis to our dataset, we were able to describe transcript composition of different regions of Drosophila testis, including several stage-specific transcripts. We present searchable visualizations that can facilitate the identification of new components that play role in the organisation and composition of different stages of spermatogenesis, including the less known, but complex regulation of post-meiotic stages.

Dataset Information

Analysis of the Drosophila melanogaster testes transcriptome reveals coordinate regulation of paralogous genes.

Publications

Analysis of the Drosophila melanogaster testes transcriptome reveals coordinate regulation of paralogous genes.

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