Human Reproduction Update, Vol.3, No.1 pp.59-78, 1997
© European Society of Human Reproduction and Embryology 1997; all rights reserved
Morphological and molecular characteristics of living human fetuses between Carnegi stages 7 and 23: localization of inhibin mRNA
and ßa subunits by in-situ hybridization
Department of Obstetrics and Gynaecology, University of Edinburgh, 37 Chalmers Street, Edinburgh EH3 9EW, UK 0 Corresponding author
Abstract
Localization of the mRNA
and ßa subunits of inhibin has previously been reported in the human gonads during the second trimester. Adrenal inhibin has also been reported in the second trimester for the
ßa and ßb subunits. Investigations showing localization by in-situ hybridization during the first trimester have not been reported. The results have shown hybridization of the
and ßa subunits, throughout the period of development studied, in a variety of tissues including the dorsal and thoracic aortas and pericardium stages 13-22 (ßa subunit); liver stages 19-21 (ßa) and stages 21-22 (
); mesonephros stages 21 and 22 (ßa); gonad stages (
and ßa); adrenal stages 19-22 (
); surface ectoderm stages 16-22 (ßa); mesenchyme stages 16-22 (ßa); amnion stages 13-16 (ßa); yolk sac stage 12 (
and ßa); cartilage stages 19-22 (ßa); and nasal proliferation stages 21 and 22 (ßa). When compared with distribution of the protein subunits it was noted that more immunostaining activity was found, suggesting that probes were not sufficiently sensitive enough to detect all levels of mRNA expressed. It can be surmised, therefore, that the lack of visual hybridization of the mRNA cannot preclude the possibility that it is not being translated within the tissue even though hybridization was not apparent.
Keywords: activin/embryo/inhibin/in-situ hybridization
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