Depletion of the MFAP1/SPP381 Splicing Factor Causes R-Loop-Independent Genome Instability.

THO/TREX is a conserved complex with a role in messenger ribonucleoprotein biogenesis that links gene expression and genome instability. Here, we show that human THO interacts with MFAP1 (microfibrillar-associated protein 1), a spliceosome-associated factor. Interestingly, MFAP1 depletion impairs cell proliferation and genome integrity, increasing ?H2AX foci and DNA breaks. This ...
phenotype is not dependent on either transcription or RNA-DNA hybrids. Mutations in the yeast orthologous gene SPP381 cause similar transcription-independent genome instability, supporting a conserved role. MFAP1 depletion has a wide effect on splicing and gene expression in human cells, determined by transcriptome analyses. MFAP1 depletion affects a number of DNA damage response (DDR) genes, which supports an indirect role of MFAP1 on genome integrity. Our work defines a functional interaction between THO and RNA processing and argues that splicing factors may contribute to genome integrity indirectly by regulating the expression of DDR genes rather than by a direct role.
Mesh Terms:
Alternative Splicing, Cell Cycle, Cell Proliferation, Contractile Proteins, DNA-Binding Proteins, Extracellular Matrix Proteins, Gene Expression Regulation, Genome, Human, Genomic Instability, HEK293 Cells, HeLa Cells, Humans, R-Loop Structures, RNA Processing, Post-Transcriptional, RNA Splicing Factors, RNA-Binding Proteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Spliceosomes
Cell Rep
Date: Dec. 06, 2018
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