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The basic helix-loop-helix protein family: comparative genomics and phylogenetic analysis.
1Belgian EMBnet Node, Bioinformatics Laboratory, Université Libre de Bruxelles, Department of Molecular Biology, B-6041 Gosselies, Belgium.
Genome Research
|May 5, 2001
Summary
This study identifies 35 and 56 basic Helix-Loop-Helix (bHLH) genes in nematodes and flies, respectively. Phylogenetic analysis reveals 44 orthologous families, suggesting ancient origins of these crucial developmental transcription factors.
Area of Science:
- Genomics
- Evolutionary Biology
- Molecular Biology
Background:
- Basic Helix-Loop-Helix (bHLH) proteins are critical transcription factors involved in metazoan development.
- These proteins also play roles in human diseases, including cancerogenesis.
Purpose of the Study:
- To comprehensively identify and classify bHLH genes in Caenorhabditis elegans and Drosophila melanogaster.
- To perform phylogenetic analysis of bHLH proteins across diverse species to understand their evolutionary history.
Main Methods:
- Extensive sequence searching within the fully sequenced genomes of C. elegans and D. melanogaster.
- Phylogenetic analysis incorporating over 350 bHLH sequences from various sources.
Main Results:
- Identified 35 bHLH genes in C. elegans and 56 in D. melanogaster, potentially representing complete sets.
- Defined 44 orthologous bHLH families, with 36 exclusive to animals and two found in both yeast and animals.
- Established that most animal bHLH families (35/38) include genes from flies, nematodes, and vertebrates, indicating an ancient common ancestor.
Conclusions:
- The common ancestor of animals, predating the Cambrian period, possessed at least 35 distinct bHLH genes.
- bHLH gene families show deep evolutionary conservation across metazoans, highlighting their fundamental roles in development.