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Related Concept Videos

Single Nucleotide Polymorphisms-SNPs01:05

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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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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.
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Updated: Aug 1, 2025

Pre-Implantation Genetic Testing for Aneuploidy on a Semiconductor Based Next-Generation Sequencing Platform
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Inversion polymorphism in a complete human genome assembly.

David Porubsky1, William T Harvey1, Allison N Rozanski1

  • 1Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, 98195, USA.

Genome Biology
|April 30, 2023
PubMed
Summary
This summary is machine-generated.

The new telomere-to-telomere (T2T) human genome reference improves inversion detection by 21%. This complete reference better represents the major human allele

Keywords:
Genomic structural variationInversionPathogenic copy number variantPericentromericT2T-CHM13

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Area of Science:

  • Genomics
  • Human Genetics
  • Structural Variation Analysis

Background:

  • The telomere-to-telomere (T2T) consortium has produced a complete human reference genome.
  • Accurate characterization of genome structural variation is crucial for understanding human genetics.
  • Previous reference genomes like GRCh38 have limitations in resolving complex genomic regions.

Purpose of the Study:

  • To evaluate the impact of the T2T reference genome on the detection and characterization of inversion polymorphisms.
  • To compare the performance of the T2T reference with the GRCh38 reference for mapping inversions.

Main Methods:

  • Remapping of sequencing data from 41 human genomes against both the T2T and GRCh38 reference genomes.
  • Comparative analysis of inversion detection sensitivity and accuracy between the two references.
  • Identification of misoriented regions and assessment of allele representation.

Main Results:

  • The T2T reference demonstrated a ~21% increase in sensitivity for mapping inversions compared to GRCh38.
  • 63 inversions were mapped with improved accuracy on the T2T reference.
  • 26 misorientations were identified within the GRCh38 reference.
  • The T2T reference was three times more likely to represent the correct orientation of the major human allele.
  • Analysis of 10 additional samples identified novel rare inversions in chromosomes 15q25.2, 16p11.2, 16q22.1-23.1, and 22q11.21.

Conclusions:

  • The T2T complete human reference genome significantly enhances the detection and accurate orientation of inversion polymorphisms.
  • Utilizing the T2T reference improves the characterization of structural variation, revealing previously missed or misoriented inversions.
  • This advancement facilitates a more comprehensive understanding of human genetic diversity and associated rare variants.