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The human HOX gene family
D Acampora1, M D'Esposito, A Faiella
1International Institute of Genetics and Biophysics, CNR, Naples, Italy.
Nucleic Acids Research
|December 25, 1989
Summary
Researchers identified 10 new human homeobox sequences, bringing the total to 30 across four HOX loci. This discovery supports evolutionary hypotheses for homeobox gene complex origins in mammals and flies.
Area of Science:
- Genetics
- Evolutionary Biology
- Molecular Biology
Background:
- Homeobox genes are crucial developmental regulators.
- Understanding human homeobox gene organization provides insights into evolution.
- Previous studies identified some human homeobox sequences.
Purpose of the Study:
- To identify and sequence new human homeobox genes.
- To characterize the organization and chromosomal locations of human HOX loci.
- To investigate the evolutionary relationships of human homeobox genes.
Main Methods:
- Isolation and sequencing of human DNA.
- Bioinformatic analysis of homeobox sequences.
- Comparative sequence analysis of homeodomains.
Main Results:
- Identification of 10 new human homeobox sequences, totaling 30.
- Characterization of four human HOX loci (HOX1-HOX4) with specific chromosomal locations and sizes.
- Clustering of homeobox genes within these loci, with HOX1 (chr7), HOX2 (chr17), HOX3 (chr12), and HOX4 (chr2).
- Classification of homeodomains into 13 homology groups based on peptide sequence.
- Alignment of HOX loci suggesting maximal sequence identity among corresponding homeodomains.
- Determination of coding regions for HOX2G, HOX2H, and HOX2I.
Conclusions:
- The findings support and extend evolutionary hypotheses for the origin of mammalian and fly homeobox gene complexes.
- The organization and sequence homology of human HOX loci reflect ancient evolutionary duplication events.
- Detailed characterization of human HOX genes contributes to understanding their role in development and evolution.