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Related Concept Videos

Mutations01:39

Mutations

97.3K
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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Mutations01:39

Mutations

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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

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The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...
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Point and Frameshift Mutations01:30

Point and Frameshift Mutations

1.6K
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: Apr 5, 2026

Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
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NF1 Mutations Prevalent but Not Clinically Relevant

    Cancer Discovery
    |August 19, 2015
    PubMed
    Summary

    Neurofibromatosis type 1 (NF1) mutations are common in melanoma, often occurring alongside other genetic alterations. However, NF1 loss did not reliably predict RAS pathway activation or treatment response in this study.

    Area of Science:

    • Oncology
    • Genetics
    • Molecular Biology

    Background:

    • Whole-exome sequencing was performed on 213 melanoma tumor samples to identify common mutations.
    • The study investigated the frequency and significance of neurofibromatosis type 1 (NF1) gene mutations in melanoma.
    • NF1 mutations were identified in 13.1% of the analyzed melanoma cases.

    Discussion:

    • NF1 mutations in melanoma typically occur independently of BRAF or NRAS mutations, suggesting a distinct role in tumorigenesis.
    • The study explored whether NF1 mutations function as a cancer driver in melanoma development.
    • Investigated the correlation between NF1 gene loss and increased RAS activity.

    Key Insights:

    • Loss of the NF1 gene was observed in a significant subset of melanomas.

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  • NF1 mutations were frequently found in melanomas lacking BRAF or NRAS alterations.
  • The study found that NF1 loss did not consistently predict elevated RAS pathway activity.

    • Outlook:

    • Further research is needed to elucidate the precise role of NF1 as a driver in melanoma.
    • Investigating the functional consequences of NF1 mutations beyond RAS activation is crucial.
    • Understanding NF1's role may reveal new therapeutic strategies for melanoma patients.