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Development, Vol 108, Issue 3 471-477, Copyright © 1990 by Company of Biologists

JOURNAL ARTICLES

The three most downstream genes of the Hox-3 cluster are expressed in human extraembryonic tissues including trophoblast of androgenetic origin

CB Oudejans, M Pannese, A Simeone, CJ Meijer and E Boncinelli
Department of Molecular Pathology, Free University, Amsterdam, The Netherlands.

Human first trimester extraembryonic tissues of normal and androgenetic origin (molar pregnancies) were investigated for the expression of 6 homeobox genes from the chromosome 12-encoded Hox-3 cluster by non-autoradiographic in situ hybridization with biotinylated RNA probes. By comparative in situ hybridization involving the use of exon- or region-specific RNA probes, analysis included the cellular distribution of alternative Hox-3 transcripts in chorionic villous tissues. A bias in extraembryonic distribution was seen between transcripts of the three most upstream Hox-3 genes (Hox-3.7, -3.6, and -3.1) versus transcripts of the 3 most downstream genes (Hox-3.3, 3.4, and 3.5). Only genes from the latter group are transcribed in human extraembryonic tissues including extraembryonic tissues of androgenetic origin. Moreover, comparative in situ hybridization showed that distinct alternative transcripts of Hox-3.3, Hox 3.4 and Hox-3.5 are exclusively found in trophoblast cells while others are present in chorionic villous stromal cells as well. These data demonstrate the existence of tissue- and cell-specific use of transcriptional (alternative gene promoters) or post-transcriptional (alternative splicing) regulation of homeobox genes in extraembryonic tissues.


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© The Company of Biologists Ltd 1990