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G protein mutations in human disease
1Molecular Pathophysiology Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892.
Abstract:
The heterotrimeric G proteins couple cell-surface receptors for extracellular signals to intracellular effectors that generate second messengers. Abnormal G protein signalling, resulting from posttranslational modifications by bacterial toxins, altered gene expression, or gene mutations, may lead to diverse biological consequences. Mutations within G protein alpha subunit genes that lead to either constitutive activation or loss of function have been identified. Such G protein mutations play a role in the pathogenesis of several human diseases, including sporadic endocrine tumors, McCune-Albright syndrome, and Albright hereditary osteodystrophy.
Insights
Heterotrimeric G proteins link cell signals to cellular responses. Mutations in G protein alpha subunits can cause disease by altering signaling, impacting human health.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Human Genetics
Background:
- Heterotrimeric G proteins act as crucial signal transducers, connecting cell-surface receptors to intracellular pathways.
- Dysregulated G protein signaling, due to toxins, gene expression changes, or mutations, has significant biological impacts.
- G protein alpha subunit mutations are implicated in various human diseases.
Purpose of the Study:
- To review the role of G protein alpha subunit mutations in human diseases.
- To highlight the consequences of altered G protein signaling.
- To discuss the pathogenic mechanisms involving G protein mutations.
Main Methods:
- Literature review of G protein signaling pathways.
- Analysis of genetic mutations in G protein alpha subunits.
- Examination of disease pathogenesis linked to G protein dysfunction.
Main Results:
- Mutations in G protein alpha subunit genes can result in constitutive activation or loss of function.
- These mutations are identified as key factors in the pathogenesis of specific human diseases.
- Examples include sporadic endocrine tumors, McCune-Albright syndrome, and Albright hereditary osteodystrophy.
Conclusions:
- G protein alpha subunit mutations are significant contributors to human disease.
- Understanding these mutations is vital for comprehending disease mechanisms and potential therapeutic targets.
- Further research into G protein signaling dysregulation is warranted.