Faculty, Staff and Student Publications
Publication Date
7-6-2023
Journal
Molecular Cell
DOI
10.1016/j.molcel.2023.06.011
PMID
37369199
PMCID
PMC10483886
PubMedCentral® Posted Date
7-6-2024
PubMedCentral® Full Text Version
Author MSS
Abstract
The pre-mRNA life cycle requires intron processing; yet, how intron-processing defects influence splicing and gene expression is unclear. Here, we find that TTDN1/MPLKIP, which is encoded by a gene implicated in non-photosensitive trichothiodystrophy (NP-TTD), functionally links intron lariat processing to spliceosomal function. The conserved TTDN1 C-terminal region directly binds lariat debranching enzyme DBR1, whereas its N-terminal intrinsically disordered region (IDR) binds the intron-binding complex (IBC). TTDN1 loss, or a mutated IDR, causes significant intron lariat accumulation, as well as splicing and gene expression defects, mirroring phenotypes observed in NP-TTD patient cells. A Ttdn1-deficient mouse model recapitulates intron-processing defects and certain neurodevelopmental phenotypes seen in NP-TTD. Fusing DBR1 to the TTDN1 IDR is sufficient to recruit DBR1 to the IBC and circumvents the functional requirement for TTDN1. Collectively, our findings link RNA lariat processing with splicing outcomes by revealing the molecular function of TTDN1.
Keywords
Animals, Mice, Introns, Trichothiodystrophy Syndromes, RNA Nucleotidyltransferases, RNA Splicing, RNA lariat, DBR1, trichothiodystrophy, spliceosome, RNA processing, transcription
Published Open-Access
yes
Recommended Citation
Townley, Brittany A; Buerer, Luke; Tsao, Ning; et al., "A Functional Link Between Lariat Debranching Enzyme and the Intron-Binding Complex Is Defective in Non-Photosensitive Trichothiodystrophy" (2023). Faculty, Staff and Student Publications. 5038.
https://digitalcommons.library.tmc.edu/uthgsbs_docs/5038
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