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Caenorhabditis japonica high resolution developmental transcriptomic time-course

ABSTRACT: Transcriptomic studies typically examine expression at the gene level, although it has been long recognized that the same genetic locus may produce isoforms distinct in their splicing and site of polyadenylation. Here we examine alternatively polyadenylated (APA) transcripts throughout embryogenesis and discover distinct strategies for gene regulation. We introduce APA-Seq, an RNA-Seq method to study APA at a global level, and apply it to study individual C. elegans embryos throughout early development. Surprisingly, we find that genes, whose overall expression is constitutive throughout development, generally show highly dynamic expression for individual isoforms. Such genes tend to participate in cellular as opposed to developmental processes, and this trend was also evident in the closely related C. japonica nematode, providing evidence that the manner by which cellular processes are regulated during embryogenesis is evolutionarily conserved. Finally, we report that genes with dynamic isoform usage have significantly more miRNA binding sites relative to constitutively-expressed isoforms, suggesting strong miRNA regulation in the control of isoform expression. Our findings support a model distinguishing two modes of gene regulatory underlying embryonic development each with unique functions and mechanisms.

ORGANISM(S): Caenorhabditis japonica

PROVIDER: GSE102398 | GEO | 2018/07/31

REPOSITORIES: GEO

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