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Partial titin cDNA sequence isolated from rabbit cardiac muscle RNA
J D Fritz1, J A Wolff, M L Greaser
1Department of Meat and Animal Science, University of Wisconsin-Madison 53706.
Journal of Muscle Research and Cell Motility
|June 1, 1993
Summary
Researchers identified cardiac titin (connectin) cDNA in rabbits, finding it highly similar to skeletal muscle titin. This suggests titin is encoded by a single gene and has conserved sequences across species.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Titin (connectin) is a large protein crucial for muscle elasticity.
- Understanding cardiac titin is vital for cardiac function research.
- Previous studies focused on skeletal muscle titin, leaving cardiac titin less explored.
Purpose of the Study:
- To isolate and characterize rabbit cardiac titin cDNA.
- To compare cardiac titin with its skeletal muscle counterpart.
- To investigate the gene structure and evolutionary conservation of titin.
Main Methods:
- RNA-PCR amplification of rabbit cardiac muscle total RNA.
- 3' rapid amplification of cDNA ends (RACE) for sequence extension.
- Southern blot analysis for gene structure.
- PCR amplification of human genomic DNA for cross-species comparison.
Main Results:
- Two rabbit cardiac titin cDNA regions (1.7 kb and 1.5 kb) were successfully amplified.
- Cardiac titin cDNA showed 99% nucleotide sequence identity to skeletal muscle titin.
- Southern blot analysis indicated cardiac and skeletal titin are encoded by the same gene.
- Human titin sequences exhibited strong similarity to rabbit titin, with large exons suggested.
Conclusions:
- Rabbit cardiac titin is highly homologous to skeletal muscle titin.
- A single gene likely encodes both cardiac and skeletal titin.
- Titin's conserved structure across species, including large exons, may facilitate RNA processing.