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Related Concept Videos

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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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Related Experiment Video

Updated: Oct 27, 2025

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
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Three-dimensional missense tolerance ratio analysis.

Riley E Perszyk1, Anders S Kristensen1, Polina Lyuboslavsky1

  • 1Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

Genome Research
|July 24, 2021
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Summary
This summary is machine-generated.

A new 3D method (3DMTR) analyzes protein variation intolerance using 3D structures, improving upon 1D methods. This approach better identifies functionally important protein regions and mutation impacts in genes like GRIN.

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Area of Science:

  • Genetics
  • Structural Biology
  • Biochemistry

Background:

  • Genetic variation data reveals well-tolerated single-nucleotide variants, offering insights into protein structure-function relationships and human health.
  • The missense tolerance ratio (MTR) assesses regional intolerance to variation along a polypeptide chain, indicating tolerance to changes without impacting health.
  • Current MTR methods average data from adjacent residues, potentially missing functional insights from non-adjacent residues forming protein motifs.

Purpose of the Study:

  • To develop a novel method for analyzing protein variation intolerance based on 3D structural proximity of residues.
  • To compare the efficacy of the new 3D method against existing 1D methods using the GRIN gene family.

Main Methods:

  • Developed a 3D missense tolerance ratio (3DMTR) analyzing residues in 3D space using crystallographic data, rather than linear sequence.
  • Applied the 3DMTR method to members of the GRIN gene family, which encode NMDA-type ionotropic glutamate receptor subunits.
  • Validated the 3DMTR score by comparing its accuracy in classifying functional consequences of point mutations against existing methods.

Main Results:

  • The 3DMTR method provides novel information on intolerance regions within NMDA receptors.
  • 3DMTR enables the analysis of protein-protein interfaces in multimeric proteins.
  • The 3DMTR score demonstrated higher accuracy in classifying the functional consequences of point mutations in GRIN family genes compared to existing methods.

Conclusions:

  • The 3DMTR method represents a significant advancement, moving protein variation analysis from 1D to a structurally relevant 3D context.
  • This new tool enhances the understanding of protein function, mutation impact, and protein interfaces, particularly for NMDA receptors.
  • 3DMTR offers a more accurate and informative approach for assessing the functional impact of genetic variants.