Overexpression of mouse follistatin causes reproductive defects in transgenic mice

Molecular Endocrinology
Q GuoM M Matzuk

Abstract

Follistatin is an activin-binding protein that can act as an activin antagonist in vitro. Follistatin also binds heparin sulfate proteoglycans and may function as a reservoir for activins in vivo. In the mouse, follistatin mRNA is first detected in the deciduum on embryonic day 5.5 and later in the developing hindbrain, somites, vibrissae, teeth, epidermis, and muscle. We have previously shown that follistatin-deficient mice have numerous embryonic defects including shiny, taut skin, growth retardation, and cleft palate leading to death within hours of birth. To further define the roles of follistatin during mammalian reproduction and development, we created gain-of-function mutant mice in which mouse follistatin is overexpressed. The mouse metallothionein (MT)-I promoter was placed upstream of the six-exon mouse follistatin (FS) gene. To distinguish wild-type and transgenic follistatin mRNA, the 3'-untranslated region of the mouse follistatin gene was replaced with the SV40 untranslated and polyA sequences. Three male and two female founder transgenic mice were produced, were fertile, and transmitted the transgene to offspring. Northern blot analysis demonstrated that the transgene mRNA was expressed at varying levels in the l...Continue Reading

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