bioRxivJClub
Small RNA-mediated genomic silencing promotes telomere stability in the absence of telomerase in C. elegans
bioRxiv · · Preprint · Open access
Lu, Bhattarai + 6 more
Abstract ↗AI summary
The abstract is read at the publisher; the summary is JClub's.
In Caenorhabditis elegans lacking telomerase, small RNA–mediated genome silencing promotes telomere stability by enriching H3K9me2 at subtelomeres via HPL-2 and germline small RNA factors.
- Why it matters: Perfect small RNAs matching (TTAGGC)n telomere repeats are rare, and telomere mutations at TERRA-transcribed 5′ ends do not explain this, leaving how telomeres remain stable in telomerase absence unclear.
- What they did: Using long-read sequencing, the study mapped telomere mutations and then tested roles of H3K9me2/HPL-2, germ granule proteins MUT-7 and MUT-14, and Argonautes WAGO-1 and HRDE-1 in telomerase mutants.
- The result: Telomerase loss induced subtelomeric small RNA biogenesis from the 5′ end of TERRA, and removing small RNA silencing together with telomerase increased TERRA expression, telomere damage, and accelerated sterility.
The findingWhy it mattersWhat they didThe result
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