The exon junction complex is required for stem and progenitor cell maintenance in planarians.

Abstract:

:Named for its assembly near exon-exon junctions during pre-mRNA splicing, the exon junction complex (EJC) regulates multiple aspects of RNA biochemistry, including export of spliced mRNAs from the nucleus and translation. Transcriptome analyses have revealed broad EJC occupancy of spliced metazoan transcripts, yet inhibition of core subunits has been linked to surprisingly specific phenotypes and a growing number of studies support gene-specific regulatory roles. Here we report results from a classroom-based RNAi screen revealing the EJC is necessary for regeneration in the planarian flatworm Schmidtea mediterranea. RNAi animals rapidly lost the stem and progenitor cells that drive formation of new tissue during both regeneration and cell turnover, but exhibited normal amputation-induced changes in gene expression in differentiated tissues. Together with previous reports that partial loss of EJC function causes stem cell defects in Drosophila and mice, our observations implicate the EJC as a conserved, posttranscriptional regulator of gene expression in stem cell lineages. This work also highlights the combined educational and scientific impacts of discovery-based research in the undergraduate biology curriculum.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Kimball C,Powers K,Dustin J,Poirier V,Pellettieri J

doi

10.1016/j.ydbio.2019.09.010

subject

Has Abstract

pub_date

2020-01-01 00:00:00

pages

119-127

issue

1

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(19)30029-6

journal_volume

457

pub_type

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