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Development of pigmentation in the eyeless mutant of the Mexican axolotl,Ambystoma mexicanum, Shaw

✍ Scribed by Epp, Leonard G.

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
907 KB
Volume
181
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The development of pigment pattern in the eyeless mutant of Ambystoma mexicanum is described. Pigmentation, is much enhanced in this mutant through increased size and branching of melanophores. The eyeless mutant does not possess the ability to adapt to its background, nor does it blanch in darkness.

Reciprocal neural crest transplants between eyeless mutants and eyed siblings indicate no intrinsic neural crest differences in the eyeless mutant. Normal optic functioning after implantation of an eye in the mutant leads to diminished pigmentation. Enhanced pigmentation in the eyeless mutant is postulated as due to abnormally high secretion of MSH by the pituitary causing normal pigment‐producing systems to operate beyond normal limitations.

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