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Ultrastructural changes of nuclei after treatment with mesodermal inducing substance
Scientia Sinica. Series B, Chemical, Biological, Agricultural, Medical & Earth Sciences
|July 1, 1982
Summary
Treatment with a mesodermal inducing substance alters nuclei in early frog embryos. Condensed chromatin disperses, suggesting a link between chromatin changes and cell differentiation during development.
Area of Science:
- Developmental biology
- Cell biology
- Molecular biology
Background:
- Early embryonic development involves cell differentiation.
- Chromatin structure plays a role in gene regulation and cell fate.
- Mesodermal induction is a key process in early vertebrate development.
Purpose of the Study:
- To investigate the ultrastructural nuclear changes in presumptive ectoderm cells upon mesodermal induction.
- To explore the relationship between chromatin transformation and the initiation of cell differentiation.
Main Methods:
- Treatment of early gastrula stage Cynops orientalis embryos with a mesodermal inducing substance (guinea pig bone marrow extract).
- Ultrastructural analysis of cell nuclei using electron microscopy.
- Observation and comparison of chromatin structure in treated and control groups.
Main Results:
- Mesodermal induction substance treatment led to the dispersion of large condensed chromatin masses in presumptive ectoderm cell nuclei.
- Successive changes from condensed to dispersed chromatin were observed.
- The transformation from heterochromatin to euchromatin was noted.
Conclusions:
- The dispersion of condensed chromatin (heterochromatin to euchromatin) is associated with the initiation of cell differentiation in response to mesodermal induction.
- These nuclear changes provide insights into the molecular mechanisms underlying neural induction and cell fate determination.