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Mutations01:39

Mutations

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Overview
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Mutations01:35

Mutations

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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...
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Viral Mutations00:36

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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Mutations in Microorganisms01:18

Mutations in Microorganisms

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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Point and Frameshift Mutations01:30

Point and Frameshift Mutations

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Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
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Related Experiment Video

Updated: Jan 20, 2026

Quantification of Colonic Stem Cell Mutations
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One NF1 Mutation may Conceal Another.

Laurence Pacot1,2, Cyril Burin des Roziers1,2, Ingrid Laurendeau2

  • 1Service de Génétique et Biologie Moléculaires, Hôpital Cochin, HUPC, Assistance Publique-Hôpitaux de Paris, 75014 Paris, France.

Genes
|August 25, 2019
PubMed
Summary
This summary is machine-generated.

Neurofibromatosis type 1 (NF1) and Legius syndrome can involve multiple genetic variants. This study found co-occurring NF1 and SPRED1 gene mutations in six families, highlighting diagnostic complexity.

Keywords:
Legius syndromeNF1SPRED1de novo variantneurofibromatosis type 1

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Area of Science:

  • Genetics
  • Molecular Biology
  • Clinical Diagnostics

Background:

  • Neurofibromatosis type 1 (NF1) is a common autosomal dominant disorder caused by NF1 gene mutations, affecting the RAS-MAPK pathway.
  • NF1 exhibits high variable expressivity and one of the highest mutation rates, leading to de novo variants.
  • Legius syndrome, a differential diagnosis for NF1, is associated with SPRED1 gene variants.

Purpose of the Study:

  • To investigate the co-occurrence of pathogenic variants in NF1 and SPRED1 genes in families with NF1 and Legius syndrome.
  • To analyze the molecular basis of complex genetic presentations in NF1 and related disorders.
  • To illustrate the challenges in molecular diagnosis for NF1.

Main Methods:

  • Next-generation sequencing was employed to analyze genetic variants.
  • Pathogenic variants were classified according to ACMG-AMP guidelines.
  • Family segregation analysis was performed for identified variants.

Main Results:

  • Co-occurrence of pathogenic NF1 and SPRED1 variants was identified in six families.
  • Five families showed co-occurring independent NF1 variants.
  • One family presented with an NF1 gene deletion and a SPRED1 variant of unknown significance, impacting siblings with NF1 and Legius syndrome.

Conclusions:

  • The study highlights the complex genetic landscape of NF1 and Legius syndrome, with potential co-occurrence of multiple pathogenic variants.
  • Molecular diagnostic complexity in NF1 is underscored by findings of multiple NF1 variants or combined NF1/SPRED1 variants.
  • Genetic testing strategies may need to account for concurrent mutations in NF1 and SPRED1 for accurate diagnosis.