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Structure and function of the HOX A1 human homeobox gene cDNA
Y S Hong1, S Y Kim, A Bhattacharya
1Department of Tumor Biology, University of Texas, M.D. Anderson Cancer Center, Houston 77030, USA.
Gene
|July 4, 1995
Summary
Homeobox (HOX) genes regulate embryonic development and are influenced by retinoic acid (RA). This study found that HOX A1 does not regulate HOX A4, but HOX A5 inhibits HOX A4 promoter activity.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Homeobox genes encode transcription factors crucial for embryonic development.
- These genes are organized in clusters and are regulated spatially, temporally, and by retinoic acid (RA).
Purpose of the Study:
- To clone and sequence human HOX A1 cDNA.
- To investigate the role of HOX A1 in regulating other HOX A cluster genes in response to RA.
Main Methods:
- Cloning and sequencing of human HOX A1 cDNA.
- In vitro translation to determine protein size.
- Cotransfection assays in PA-1 teratocarcinoma cells using promoter-reporter constructs.
Main Results:
- Full-length human HOX A1 cDNA was sequenced and found to be homologous to its murine counterpart.
- HOX A1 expression is induced by RA in PA-1 cells.
- HOX A1 did not affect HOX A4 promoter activity, but HOX A5 inhibited it.
Conclusions:
- HOX A1 is an early RA-inducible gene in the HOX A cluster.
- HOX A1 does not appear to directly regulate the HOX A4 promoter.
- HOX A5 demonstrates inhibitory effects on HOX A4 promoter activity, suggesting complex regulatory interactions within the HOX A cluster.