Helicase-inactivating mutations as a basis for dominant negative phenotypes

Cell Cycle. 2010 Oct 15;9(20):4080-90. doi: 10.4161/cc.9.20.13667.


There is ample evidence from studies of both unicellular and multicellular organisms that helicase-inactivating mutations lead to cellular dysfunction and disease phenotypes. In this review, we will discuss the mechanisms underlying the basis for abnormal phenotypes linked to mutations in genes encoding DNA helicases. Recent evidence demonstrates that a clinically relevant patient missense mutation in Fanconi Anemia Complementation Group J exerts detrimental effects on the biochemical activities of the FANCJ helicase, and these molecular defects are responsible for aberrant genomic stability and a poor DNA damage response. The ability of FANCJ to use the energy from ATP hydrolysis to produce the force required to unwind duplex or G-quadruplex DNA structures or destabilize protein bound to DNA is required for its DNA repair functions in vivo. Strikingly, helicase-inactivating mutations can exert a spectrum of dominant negative phenotypes, indicating that expression of the mutant helicase protein potentially interferes with normal DNA metabolism and has an effect on basic cellular processes such as DNA replication, the DNA damage response and protein trafficking. This review emphasizes that future studies of clinically relevant mutations in helicase genes will be important to understand the molecular pathologies of the associated diseases and their impact on heterozygote carriers.

Publication types

  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Apoptosis / genetics
  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism
  • DNA Damage
  • DNA Helicases / antagonists & inhibitors*
  • DNA Helicases / genetics*
  • DNA Helicases / metabolism
  • DNA Repair*
  • DNA Replication*
  • Fanconi Anemia / enzymology
  • Fanconi Anemia / genetics
  • Fungal Proteins / genetics
  • Fungal Proteins / metabolism
  • Genetic Complementation Test
  • Humans
  • Molecular Sequence Data
  • Mutation
  • Phenotype*
  • Tumor Suppressor Protein p53 / metabolism


  • Bacterial Proteins
  • Fungal Proteins
  • Tumor Suppressor Protein p53
  • DNA Helicases