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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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%...
Genetic Variation01:25

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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,...
Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
Karyotyping01:17

Karyotyping

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Related Experiment Video

Updated: May 30, 2026

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
09:16

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants

Published on: February 21, 2015

Human copy number variation and complex genetic disease.

Santhosh Girirajan1, Catarina D Campbell, Evan E Eichler

  • 1Department of Genome Sciences and Howard Hughes Medical Institute, University of Washington, Seattle, Washington 98195, USA. sangi@u.washington.edu

Annual Review of Genetics
|August 23, 2011
PubMed
Summary

Copy number variants (CNVs) impact human disease and diversity. Further research is needed to explore smaller CNVs and those in complex genomic regions for a complete understanding of genetic disease.

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Last Updated: May 30, 2026

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Area of Science:

  • Genetics
  • Human Genomics

Background:

  • Copy number variants (CNVs) are crucial in human disease and diversity.
  • Technological advances enable large-scale CNV analysis in patient and control cohorts.
  • Rare CNVs link to neuropsychiatric disorders like autism and schizophrenia.

Purpose of the Study:

  • To explore the largely uncharted landscape of copy number variation.
  • To investigate smaller CNVs and those within complex genomic regions.
  • To integrate single nucleotide variant and CNV data for comprehensive genetic analysis.

Main Methods:

  • Analysis of copy number variants (CNVs) in large cohorts of individuals with disease and healthy controls.
  • Characterization of single nucleotide variants alongside CNVs.
  • Focus on smaller CNVs and those in complex genomic regions.

Main Results:

  • Rare CNVs identified as significant contributors to neuropsychiatric diseases.
  • Copy number polymorphisms (CNPs) associated with immune and environmental responses.
  • Significant gaps remain in understanding smaller and complex region CNVs.

Conclusions:

  • An integrated approach combining single nucleotide variant and CNV analysis is essential.
  • This approach promises to fully elucidate the genetic basis of human disease and diversity.
  • Further exploration of CNVs, especially smaller ones, is critical for advancing genomic medicine.