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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%...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Nondisjunction01:29

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
Nondisjunction01:21

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
Nondisjunction01:29

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.

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Related Experiment Video

Updated: Jun 4, 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

Linking chromosome abnormality and copy number variation.

Jannine D Cody1, Daniel E Hale

  • 1Department of Pediatrics, University of Texas Health Science Center at San Antonio, USA. cody@uthscsa.edu

American Journal of Medical Genetics. Part A
|February 24, 2011
PubMed
Summary

Most people have DNA copy number variations (CNVs), which can be harmless or cause disease. Further research is needed to understand CNV relevance and predict their impact.

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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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Published on: August 17, 2022

Area of Science:

  • Genetics
  • Genomics
  • Molecular Biology

Background:

  • Chromosome copy number variations (CNVs) are common, affecting over 90% of individuals.
  • The clinical significance of most CNVs remains largely unknown, with varying interpretations in scientific literature.
  • CNVs are sometimes considered normal variations, yet other studies link them to developmental disabilities.

Purpose of the Study:

  • To highlight the prevalence and uncertain clinical relevance of DNA copy number variations (CNVs).
  • To emphasize the need for a systematic approach to classify gene dosage sensitivity.
  • To advocate for developing predictive principles for the consequences of genomic copy number changes.

Main Methods:

  • Review of existing literature on chromosome copy number variations.
  • Analysis of contrasting study findings regarding CNV pathogenicity.
  • Identification of knowledge gaps in understanding CNV relevance.

Main Results:

  • A significant majority of individuals possess CNVs larger than 1,000 base pairs.
  • The impact of CNVs ranges from inconsequential to causing disease or disability.
  • The relevance of most identified CNVs is currently undetermined.

Conclusions:

  • A unified effort is required to classify genes based on their dosage sensitivity.
  • Establishing principles for predicting the effects of genomic copy number changes is crucial.
  • Understanding CNVs is essential for advancing genetic diagnostics and personalized medicine.