Graded changes in dose of a Xenopus activin A homologue elicit stepwise transitions in embryonic cell fate - PubMed (original) (raw)
. 1990 Sep 27;347(6291):391-4.
doi: 10.1038/347391a0.
Affiliations
- PMID: 1699129
- DOI: 10.1038/347391a0
Graded changes in dose of a Xenopus activin A homologue elicit stepwise transitions in embryonic cell fate
J B Green et al. Nature. 1990.
Abstract
The protein XTC-MIF, a Xenopus homologue of activin A and a potent mesoderm-inducing factor, can induce responding animal pole explants to form several different cell types in a dose-dependent manner, higher doses eliciting more dorso-anterior tissues. This graded response, characteristic of classically postulated morphogens, may underlie pattern formation, but the response of intact animal caps to XTC-MIF provides only a crude indication of trends. Here we report the effects of XTC-MIF on dispersed blastomeres rather than intact animal caps. Under these conditions, responding cells distinguish sharply between doses of pure XTC-MIF differing by less than 1.5-fold. Two different response thresholds have been found, defining three cell states. This suggests that XTC-MIF has an instructive effect. Notochord and muscle are both induced in the same narrow dose-range. Mixing treated with untreated cells does not seem to shift the dose thresholds, showing that at least some cells can stably record the received dose of inducing factor.
Comment in
- Embryology. Activins and induction.
Wylie C. Wylie C. Nature. 1990 Sep 27;347(6291):337-8. doi: 10.1038/347337a0. Nature. 1990. PMID: 2215646 No abstract available.
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