Nucleic Acids Research, 1990, Vol. 18, No. 15 4361-4368
© 1990
MOLECULAR BIOLOGY |
Molecular mechanisms underlying the expression of the human HOX-5.1 gene
Department of Hematology and Oncology, Istituto Superiore di Sanita Viale Regina Elena 299, 00161 Rome 1Clinica Ostetrica e Ginecologica, Ospedale Civile di Avellino 83100 Avellino 2International Institute of Genetics and Biophysics-CNR Via G. Marconi 10, 80125 Naples, Italy
*To whom correspondence should be addressed
Received May 30, 1990. Accepted June 13, 1990.
The complex mechanisms underlying homeobox genes expression involve regulation at transcriptional, posttranscriptional and translational levels. The multiple transcripts of the human HOX-5.1 gene are expressed differentially in tissue- and stage-specific patterns during embryogenesis, and differentially induced by retinoic acid (RA) in human embryonal carcinoma (EC) NT2/D1 cells. We have sequenced 6.3 Kb of the genomic region containing the HOX-5.1 gene and analyzed its mechanisms of expression. Two alternative promoters underlie the transcription of two classes of HOX-5.1-specific mRNAs. These classes differ in tissue and subcellular distribution, induction by RA, structure of the 5'-UT region and mRNA stability: these features are compatible with a differential function of the two classes of transcripts in embryogenesis.
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