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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transcription factor IIH (TFIIH) is crucial for transcription and DNA repair.
  • TFIIH comprises 10 subunits, including core-TFIIH and CAK sub-complexes linked by XPD.
  • ERCC2/XPD gene variants cause xeroderma pigmentosum (XP) or trichothiodystrophy (TTD), with differing cancer risks.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying trichothiodystrophy (TTD) pathogenesis.
  • To elucidate how TTD-associated ERCC2/XPD variants affect TFIIH function and cellular processes.

Main Methods:

  • Mass spectrometry to analyze protein complexes.
  • Gene silencing experiments to assess functional requirements.
  • Analysis of TFIIH subunit interactions and chromatin binding.

Main Results:

  • TTD variants cause partial dissociation of the CAK sub-complex from chromatin and core-TFIIH.
  • Chromatin-bound TFIIH, including CAK, forms a complex with DDX1, SFPQ, NONO, and RNA polymerase II (Pol II).
  • This complex is essential for processing DNA:RNA hybrids and preventing transcriptional stress; TTD variants lead to R-loop accumulation.

Conclusions:

  • TTD-specific ERCC2/XPD variants destabilize TFIIH, disrupting the DDX1-SFPQ-NONO interaction.
  • Reduced TFIIH levels and impaired R-loop processing cause transcriptional stress and gene expression deregulation in TTD.
  • These molecular defects account for the wide-ranging clinical manifestations of TTD.