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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Related Experiment Video

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Detection of Rare Genomic Variants from Pooled Sequencing Using SPLINTER
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Evaluating ClinGen variant curation expert panels' application of PVS1 code.

Xiaoyan Wang1, Haibo Li2, Haiyan Luo3

  • 1Medical Genetics Center, Maternal and Child Health Hospital of Hubei Province, Wuhan, Hubei, China.

European Journal of Medical Genetics
|January 10, 2024
PubMed
Summary

Variant Curation Expert Panels (VCEPs) often follow guidelines for loss-of-function (LOF) variants, but gene-specific factors cause inconsistencies. Standardizing LOF variant interpretation is crucial for genetic data analysis.

Keywords:
ACMG/AMPClassificationPVS1VCEPVariants

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Area of Science:

  • Genetics and Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • The 2015 ACMG/AMP guidelines acknowledge loss-of-function (LOF) variants but leave detailed interpretation to expert judgment.
  • Variant Curation Expert Panels (VCEPs) develop gene/disease-specific criteria for LOF variant classification under the ClinGen initiative.
  • Understanding different types of LOF variants and their impact on gene product absence is critical for genetic diagnosis.

Purpose of the Study:

  • To evaluate the loss-of-function (LOF) criteria (PVS1) developed by Variant Curation Expert Panels (VCEPs).
  • To analyze the application of PVS1 criteria in variant classification and identify areas for improved standardization.
  • To provide a comprehensive understanding of LOF variant interpretation for genetic data analysis professionals.

Main Methods:

  • Evaluated LOF criteria (PVS1) from seven VCEPs, assessing disease mechanisms, protein transcripts, and variant types.
  • Meticulously curated LOF evidence used by VCEPs in preliminary variant classifications.
  • Analyzed VCEP criteria specifications and their application in interpreting predictive criteria for LOF variants.

Main Results:

  • VCEPs largely followed Sequence Variant Interpretation (SVI) recommendations for LOF criteria, with some gene/disease-specific exceptions.
  • Observed a wide range of PVS1 strength levels across VCEPs, indicating diverse evidence for variant types.
  • Identified substantial differences among VCEPs regarding the assessment of null variant strengths, variant location, NMD, and protein function impact.

Conclusions:

  • Interpreting PVS1 criteria requires expert knowledge, highlighting the complexity of LOF variant analysis.
  • VCEP criteria specifications enhance accessibility for curators but necessitate further standardization.
  • There is a clear need for enhanced guidance to ensure consistency in applying predictive evidence for LOF variants.