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Histochemical differences in expression of X-linked glucose-6-phosphate dehydrogenase between ectoderm- and endoderm-derived embryonic and extra-embryonic tissues

H Sobis, A Verstuyf and M Vandeputte

Rega Institute for Medical Research, University of Leuven, Belgium.

We examined the activity of X-linked glucose-6-phosphate dehydrogenase (G6PD) in concepti of the enzyme-deficient mutant and wild-type C3H mice. By using different crosses between the G6PD-deficient homozygous, heterozygous, or wild-type females and hemizygous or wild-type males, we confirmed the inactivation of one of the two X chromosomes in female concepti by a histochemical method. With this technique, a dual (G6PD + or -) cell population could be observed in the tissue sections. We demonstrate that the paternal X chromosome is inactivated in the endoderm of parietal and visceral yolk sac and in the trophoblast, whereas in the embryo and in the yolk sac mesoderm this inactivation is random. Our results confirm biochemical observations showing that only the maternal X chromosome is expressed in all derivatives of trophectoderm and primitive endoderm, whereas derivatives of the primitive ectoderm show random X chromosome expression.

Volume 39, Issue 5, pp. 569-574, 05/01/1991
Copyright © 1991 by The Histochemical Society


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