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Related Concept Videos

Lethal Alleles02:41

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
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Mutations in Microorganisms

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Related Experiment Video

Updated: Jun 7, 2026

Inducible and Reversible Dominant-negative (DN) Protein Inhibition
08:35

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Published on: January 7, 2019

Helicase-inactivating mutations as a basis for dominant negative phenotypes.

Yuliang Wu1, Robert M Brosh

  • 1Laboratory of Molecular Gerontology, National Institute on Aging, NIH, NIH Biomedical Research Center, Baltimore, MD, USA.

Cell Cycle (Georgetown, Tex.)
|October 29, 2010
PubMed
Summary

Mutations in DNA helicase genes cause cellular dysfunction and disease. A specific mutation in Fanconi Anemia Complementation Group J (FANCJ) impairs DNA repair, leading to genomic instability and poor DNA damage response.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Mutations in DNA helicases are linked to cellular dysfunction and disease phenotypes across organisms.
  • DNA helicases are crucial enzymes that unwind DNA structures, essential for various cellular processes.

Purpose of the Study:

  • To review the mechanisms by which mutations in DNA helicase genes cause abnormal phenotypes.
  • To highlight the impact of a specific FANCJ helicase mutation on genomic stability and DNA damage response.

Main Methods:

  • Review of existing literature on helicase function and mutations.
  • Analysis of recent evidence on a specific missense mutation in the FANCJ gene.

Main Results:

  • Clinically relevant FANCJ mutations negatively affect helicase biochemical activities.
  • These defects result in aberrant genomic stability and impaired DNA damage response.
  • Dominant negative phenotypes suggest interference with DNA replication, repair, and protein trafficking.

Conclusions:

  • Understanding molecular pathologies of helicase gene mutations is crucial for disease understanding.
  • Future studies on clinically relevant mutations will elucidate impacts on heterozygote carriers.