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Two distinct cDNA sequences encoding the human helix-loop-helix protein Id2
M Kurabayashi1, R Jeyaseelan, L Kedes
1Institute for Genetic Medicine, University of Southern California School of Medicine, Los Angeles 90033.
Gene
|November 15, 1993
Summary
Researchers identified two human inhibitor of differentiation (Id2) cDNA clones, Id2A and Id2B, from heart tissue. Id2B contains a mutation and originates from an intronless gene, suggesting evolutionary divergence.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The inhibitor of differentiation (Id) gene family plays crucial roles in regulating cell proliferation, differentiation, and apoptosis.
- Understanding the specific isoforms and their genetic origins is essential for elucidating their functions in human development and disease.
Purpose of the Study:
- To isolate and characterize distinct Id2 cDNA clones from human heart tissue.
- To investigate the genetic basis and evolutionary implications of identified Id2 variants.
Main Methods:
- Isolation and sequencing of cDNA clones from a human heart library.
- Deduction of amino acid sequences from cDNA.
- Characterization of genomic clones to analyze gene structure.
Main Results:
- Two distinct Id2 cDNA clones, Id2A and Id2B, were identified.
- Id2A and Id2B exhibit nearly identical amino acid sequences, with Id2B containing a nonsense mutation at codon 37.
- Genomic analysis revealed that Id2B is encoded by an intronless gene, distinct from typical Id2 gene structures.
Conclusions:
- The Id2B variant likely arose from an intronless gene, possibly after the evolutionary split between rats and humans.
- These findings contribute to the understanding of Id2 gene regulation and evolution in the human heart.