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Chemical modification of cell type determination in Amphibian embryos

✍ Scribed by McDonald, Ruth I.

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
939 KB
Volume
186
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The polyanion, polyethylene sulfonate, and the polycation, protamine sulfate, alter the epidermal differentiation of ventral ectoderm in the axolotl, Ambystoma mexicanum. Polyethylene sulfonate reverts stage 121/2 ventral ectoderm, determined to become epidermis, to ectoderm competent for neuralization, while protamine sulfate reduces the neuralization of stages 10½–11 ectoderm. Polyethylene sulfonate also decreases the basic protein staining in the nuclei of stage 121/2 ventral ectoderm and the amount of intense staining heterochromatic DNA in stages 12, 121/2, and 13 ectoderm. Protamine sulfate, in contrast, increases the basic protein staining and the amount of heterochromatic DNA in stages 11 to 14 ventral ectoderm. In addition, polyethylene sulfonate also causes a doubling of the mitotio index of stage 121/2 ventral ectoderm. On the basis of these results, the theory is proposed that the reversal in determination of stage 121/2 ventral ectoderm following polyethylene sulfonate involves decreased histone‐DNA binding and increased DNA replication.

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