ZFIN ID: ZDB-PUB-140513-148
Evolutionary conservation of TFIIH subunits: Implications for the use of zebrafish as a model to study TFIIH function and regulation
Silva, I.A., Cox, C.J., Leite, R.B., Cancela, M.L., Conceição, N.
Date: 2014
Source: Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology   172-173C: 9-20 (Journal)
Registered Authors:
Keywords: Transcription regulation, Transcriptional factor IIH (TFIIH), Xeroderma pigmentosum B (XPB), Xeroderma pigmentosum D (XPD), Zebrafish
MeSH Terms:
  • Alternative Splicing
  • Amino Acid Sequence
  • Animals
  • Binding Sites
  • Chromosome Mapping
  • Conserved Sequence
  • Evolution, Molecular*
  • Fishes/genetics
  • Humans
  • Molecular Sequence Data
  • Octamer Transcription Factor-1/genetics
  • Octamer Transcription Factor-1/metabolism
  • Promoter Regions, Genetic
  • Protein Conformation
  • Transcription Factor AP-1/genetics
  • Transcription Factor AP-1/metabolism
  • Transcription Factor TFIIH/chemistry
  • Transcription Factor TFIIH/physiology*
  • Xeroderma Pigmentosum Group D Protein/chemistry
  • Xeroderma Pigmentosum Group D Protein/genetics
  • Zebrafish/genetics
  • Zebrafish Proteins/genetics
PubMed: 24731924 Full text @ Comp. Biochem. Physiol. B Biochem. Mol. Biol.
Transcriptional factor IIH (TFIIH) is involved in cell cycle regulation, nucleotide excision repair, and gene transcription. Mutations in three of its subunits, XPB, XPD, and TTDA, lead to human recessive genetic disorders such as trichothiodystrophy and xeroderma pigmentosum, the latter of which is sometimes associated with Cockayne's syndrome. In the present study, we investigate the sequence conservation of TFIIH subunits among several teleost fish species and compare their characteristics and putative regulation by transcription factors to those of human and zebrafish. We report the following findings: (i) comparisons among protein sequences revealed a high sequence identity for each TFIIH subunit analysed; (ii) among transcription factors identified as putative regulators, OCT1 and AP1 have the highest binding-site frequencies in the promoters of TFIIH genes, and (iii) TFIIH genes have alternatively spliced isoforms. Finally, we compared the protein primary structure in human and zebrafish of XPD and XPB - two important ATP-dependent helicases that catalyse the unwinding of the DNA duplex at promoters during transcription - highlighting the conservation of domain regions such as the helicase domains. Our study suggests that zebrafish, a widely used model for many human diseases, could also act as an important model to study the function of TFIIH complex in repair and transcription regulation in humans.