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Sequence of a cDNA encoding dog insulin-like growth factor I
P Delafontaine1, H Lou, D G Harrison
1Division of Cardiology, Emory University School of Medicine, Atlanta, GA 30322.
Gene
|August 25, 1993
Summary
Researchers amplified dog insulin-like growth factor I (IGFI) cDNA from heart tissue, creating a clone named IGFI5.1. This dog IGFI sequence is identical to human IGFI at the amino acid level.
Area of Science:
- Molecular Biology
- Cardiovascular Research
- Comparative Genomics
Background:
- Insulin-like growth factor I (IGFI) plays crucial roles in cellular functions.
- Understanding IGFI gene organization across species aids in comparative studies.
- Canine cardiovascular research benefits from detailed molecular insights.
Purpose of the Study:
- To isolate and characterize the cDNA for dog insulin-like growth factor I (IGFI).
- To compare the deduced amino acid sequence of dog IGFI with known mammalian sequences.
- To investigate the gene structure of canine IGFI.
Main Methods:
- Polymerase chain reaction (PCR) amplification of cDNA from dog left ventricular myocardium.
- Utilizing primers specific for rat IGFI exons 3 and 6.
- Sequencing and analysis of the resulting dog IGFI clone (IGFI5.1).
Main Results:
- Successfully amplified and isolated a dog IGFI cDNA clone, designated IGFI5.1.
- The clone contains the signal peptide, mature coding sequence, and C-terminal extension.
- The deduced amino acid sequence of mature dog IGFI is identical to human IGFI.
- The cDNA was named dog IGFIa based on analogy with rat and human gene organization.
Conclusions:
- The study successfully characterized a novel dog IGFI cDNA clone.
- The high sequence identity between dog and human mature IGFI suggests conserved function.
- This work provides a foundation for further research into canine IGFI's role in cardiovascular physiology.