Phenomena and Processes

Sister Chromatid Exchange

An exchange of segments between the sister chromatids of a chromosome, either between the sister chromatids of a meiotic tetrad or between the sister chromatids of a duplicated somatic chromosome. Its frequency is increased by ultraviolet and ionizing radiation and other mutagenic agents and is particularly high in BLOOM SYNDROME.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

An exchange of segments between the sister chromatids of a chromosome, either between the sister chromatids of a meiotic tetrad or between the sister chromatids of a duplicated somatic chromosome. Its frequency is increased by ultraviolet and ionizing radiation and other mutagenic agents and is particularly high in BLOOM SYNDROME.

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See Also

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Synonyms

5 entry terms
  • Chromatid Exchange, Sister
  • Chromatid Exchanges, Sister
  • Exchange, Sister Chromatid
  • Exchanges, Sister Chromatid
  • Sister Chromatid Exchanges

MeSH Record

Aspects Covered

6 allowable subheadings

Indexed with the subheadings drug effects, ethics, genetics, immunology, physiology, radiation effects.

MeSH Record

History Note

85(80); was see under CROSSING OVER (GENETICS) 1980-84

MeSH Record

Previous Indexing

  • Chromatids (1968-1979)
  • Chromosome Aberrations (1968-1979)
  • Crossing Over (Genetics) (1968-1979)
  • Cytogenetics (1967)
  • Genetics (1966)

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NLM Classification

QU 500

AMA Style

References

  1. National Library of Medicine. Sister Chromatid Exchange. Medical Subject Headings (MeSH). 2026. Unique ID D012854. http://id.nlm.nih.gov/mesh/2026/D012854
  2. Sister Chromatid Exchange. In: Wikipedia. https://en.wikipedia.org/wiki/Sister_chromatid_exchange
  3. Sister Chromatid Exchange. In: Wikidata. https://www.wikidata.org/wiki/Q21095324