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Related Concept Videos

Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Nucleotide Excision Repair

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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Mutations01:39

Mutations

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Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

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The Lambda Select cII Mutation Detection System
07:08

The Lambda Select cII Mutation Detection System

Published on: April 26, 2018

Founder mutations in xeroderma pigmentosum.

Deborah Tamura1, John J DiGiovanna, Kenneth H Kraemer

  • 1Dermatology Branch, National Cancer Institute, Bethesda, MD 20892, USA.

The Journal of Investigative Dermatology
|May 14, 2010
PubMed
Summary

A founder mutation in the XPC DNA repair gene is prevalent in North African xeroderma pigmentosum (XP) families. This discovery aids genetic counseling and early diagnosis for XP patients with high skin cancer rates.

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Area of Science:

  • Genetics
  • Dermatology
  • Molecular Biology

Background:

  • Xeroderma pigmentosum (XP) is a rare genetic disorder characterized by extreme sensitivity to ultraviolet (UV) radiation.
  • Patients with XP exhibit a significantly increased risk of developing skin cancers, including basal cell carcinoma, squamous cell carcinoma, and melanoma.
  • The Maghreb region in North Africa shows a notable prevalence of XP cases.

Discussion:

  • Soufir et al. identified a specific founder mutation in the XPC DNA repair gene responsible for 74% of XP cases in the Maghreb.
  • The XPC gene plays a crucial role in nucleotide excision repair (NER), a pathway essential for removing DNA damage caused by UV radiation.
  • The high frequency of this founder mutation suggests a common ancestral origin for XP in this population.

Key Insights:

  • A founder mutation in the XPC gene is a primary cause of xeroderma pigmentosum in North Africa.
  • This mutation is linked to a high incidence of skin cancer among affected individuals.
  • Identification of this specific mutation facilitates targeted genetic screening and diagnosis.

Outlook:

  • The identified founder mutation offers a valuable tool for genetic counseling and early diagnosis of XP in the Maghreb.
  • Further research can explore the specific mechanisms linking XPC mutations to cancer development in XP patients.
  • Population-specific genetic studies can improve understanding and management of rare genetic disorders globally.