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Protocol for the sequence analysis of ryanodine receptor subtype 1 gene transcripts from human leukocytes
Natasha Kraev1, Julian C P Loke, Alexander Kraev
1Department of Anaesthesia, University of Toronto, Ontario, Canada.
Anesthesiology
|July 29, 2003
Summary
Leukocytes can substitute for muscle tissue in screening the ryanodine receptor subtype 1 (RYR1) gene for mutations causing malignant hyperthermia and central core disease. This avoids invasive muscle biopsies, simplifying genetic analysis.
Area of Science:
- Genetics
- Molecular Biology
- Human Physiology
Background:
- Malignant hyperthermia and central core disease are linked to RYR1 gene mutations.
- The RYR1 gene's 106 exons complicate mutation screening.
- Muscle biopsy for RYR1 cDNA analysis is invasive.
Purpose of the Study:
- To identify an alternative to muscle biopsy for RYR1 gene analysis.
- To evaluate leukocytes as a source of RYR1 cDNA for mutation screening.
Main Methods:
- RNA extraction and reverse transcription from human blood leukocytes.
- Amplification of overlapping RYR1 cDNA fragments via PCR.
- Double-strand sequencing of amplified cDNA fragments.
Main Results:
- Leukocyte RYR1 cDNA sequences matched muscle RYR1 cDNA sequences.
- Aberrant splicing in blood-derived cDNA was manageable with proper preparation.
- Silent nucleotide polymorphisms were identified, refining the RYR1 sequence.
Conclusions:
- Leukocytes are a suitable alternative to muscle for RYR1 gene screening.
- This finding simplifies the search for RYR1 mutations in affected families.
- Non-invasive genetic screening for RYR1 disorders is now more feasible.