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The gene coding for tropoelastin is represented as a single copy sequence in the haploid sheep genome
Collagen and Related Research
|April 1, 1987
Summary
Fetal sheep elastin mRNA produces two distinct polypeptides. These tropoelastin variants originate from a single elastin gene, as confirmed by molecular analysis.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Elastin is a crucial protein for tissue elasticity.
- Understanding elastin gene expression is vital for connective tissue research.
Purpose of the Study:
- To identify the primary in vitro translation products of fetal sheep nuchal ligament elastin mRNA.
- To determine the gene copy number and structure of the sheep elastin gene.
Main Methods:
- In vitro translation using rabbit reticulocyte and wheat germ extract systems.
- RNA species analysis and restriction endonuclease mapping of sheep genomic DNA.
- Hybridization techniques (Southern and slot-blot) for gene copy number quantitation.
Main Results:
- Two distinct elastin polypeptides (63 and 65 kDa) were identified.
- Both polypeptides underwent co-translational processing by signal peptidase.
- A single 3.5 kb RNA species encodes both polypeptides.
- Restriction mapping and hybridization studies indicated a single elastin gene in sheep.
Conclusions:
- The two tropoelastin polypeptides are encoded by a single elastin gene.
- This suggests a common regulatory mechanism for elastin production in fetal sheep.