ArticleGenetics2026
The DREAM and MEC NuRD complexes reinforce SPR-5/MET-2 maternal reprogramming to maintain the germline-soma distinction.
Article in Genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The proper coordination of transcription factors, ATP dependent chromatin remodelers, and histone modifications is essential for tissue-specific gene expression, but how gene expression is regulated at these different levels is not well understood. In Caenorhabditis elegans, H3K4 methylation that is acquired in the germline is reprogrammed at fertilization by the H3K4me1/2 demethylase SPR-5/LSD1/KDM1A and the H3K9 methyltransferase MET-2/SETDB1/KMT2E. SPR-5/MET-2 maternal reprogramming is required to help establish the germline-soma distinction and prevent developmental delay by preventing inherited H3K4 methylation from inappropriately maintaining germline gene expression in somatic tissues. To determine if the DREAM transcriptional repressor complex and the MEC NuRD ATP dependent nucleosome remodeling and histone deacetylase complex function to reinforce SPR-5/MET-2 maternal reprogramming, we asked if loss of these complexes affects the ectopic germline transcription and developmental delay in spr-5; met-2 double mutants. We find that knocking down the DREAM or MEC NuRD complexes specifically exacerbates the developmental delay and the ectopic expression of germline genes in the soma caused by loss of SPR-5 and MET-2. In addition, the DREAM and MEC NuRD complexes bind together at SPR-5/MET-2 reprogramming targets. These data suggest that the transcriptional repression of DREAM and the ATP dependent chromatin remodeling and deacetylation activities of the MEC NuRD complex are required somatically to reinforce maternal histone reprogramming by SPR-5/MET-2. Thus, these data provide a novel example of how gene regulation is coordinated at multiple levels to maintain the germline-soma distinction and ensure proper development.
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