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The genetic basis of malignant hyperthermia
1Banting and Best Department of Medical Research, University of Toronto, Ontario, Canada.
Trends in Pharmacological Sciences
|August 1, 1992
Summary
Malignant hyperthermia, a severe reaction to anesthesia, is linked to mutations in the RYR1 gene in pigs and some humans. This genetic link provides a basis for understanding and potentially treating this dangerous condition.
Area of Science:
- Genetics
- Molecular Biology
- Anesthesiology
Background:
- Malignant hyperthermia (MH) is a severe, potentially fatal reaction to anesthesia.
- It causes skeletal muscle rigidity, hypermetabolism, and high fever.
- MH affects both humans and swine, leading to tissue damage, death, or devalued meat products.
Purpose of the Study:
- To investigate the genetic basis of malignant hyperthermia.
- To identify the specific gene mutation responsible for MH in pigs and humans.
- To explore the role of the skeletal muscle calcium-release channel gene, RYR1.
Main Methods:
- Comparative analysis of RYR1 cDNA sequences between normal and MH-affected pigs.
- Genetic linkage studies in over 450 pigs across six breeds.
- Examination of RYR1 mutations in human families with a history of MH.
Main Results:
- A single RYR1 gene mutation (Cys for Arg615) was identified as the sole sequence difference in MH-susceptible pigs.
- This mutation was strongly linked to MH in pigs across multiple breeds.
- The corresponding RYR1 mutation (Cys for Arg614) was found in some human families with MH.
Conclusions:
- A specific mutation in the RYR1 gene is a primary cause of malignant hyperthermia in pigs and some human populations.
- The RYR1 gene is a critical factor in MH susceptibility.
- Further research is needed to identify other genetic factors involved in MH in families without RYR1 linkage.