Phenomena and Processes

Lac Operon

The genetic unit consisting of three structural genes, an operator and a regulatory gene. The regulatory gene controls the synthesis of the three structural genes: BETA-GALACTOSIDASE and beta-galactoside permease (involved with the metabolism of lactose), and beta-thiogalactoside acetyltransferase.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

The genetic unit consisting of three structural genes, an operator and a regulatory gene. The regulatory gene controls the synthesis of the three structural genes: BETA-GALACTOSIDASE and beta-galactoside permease (involved with the metabolism of lactose), and beta-thiogalactoside acetyltransferase.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

Synonyms

15 entry terms
  • Lactose Operon
  • Lac Operons
  • Lactose Operons
  • Operon, Lac
  • Operon, Lactose
  • Operons, Lac
  • Operons, Lactose
  • Lac Gene
  • LacZ Genes
  • Gene, Lac
  • Gene, LacZ
  • Genes, Lac
  • Genes, LacZ
  • Lac Genes
  • LacZ Gene

MeSH Record

Aspects Covered

6 allowable subheadings

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

MeSH Record

Indexing Annotation

note category; consider also LAC REPRESSORS (see note on REPRESSOR PROTEINS)

MeSH Record

History Note

79

MeSH Record

Previous Indexing

  • Lactose (1966-1978)
  • Operon (1969-1978)

MeSH Hierarchy

Tree Numbers

  1. G05.360w.340w.024.686w.545w
  2. G05.360w.340w.358.207w.500w.545w

AMA Style

References

  1. National Library of Medicine. Lac Operon. Medical Subject Headings (MeSH). 2026. Unique ID D007763. http://id.nlm.nih.gov/mesh/2026/D007763
  2. Lac Operon. In: Wikipedia. https://en.wikipedia.org/wiki/Lac_operon
  3. Lac Operon. In: Wikidata. https://www.wikidata.org/wiki/Q311359