ZFIN ID: ZDB-PUB-961014-388
Induction of muscle pioneers and floor plate is distinguished by the zebrafish no tail mutation
Halpern, M.E., Ho, R.K., Walker, C., and Kimmel, C.B.
Date: 1993
Source: Cell 75: 99-111 (Journal)
Registered Authors: Halpern, Marnie E., Ho, Robert K., Kimmel, Charles B., Walker, Charline
Keywords: none
MeSH Terms: Animals; Blastomeres/physiology; Cell Differentiation; Central Nervous System/cytology; Central Nervous System/embryology (all 18) expand
PubMed: 8402905 Full text @ Cell
ABSTRACT
Dorsal mesoderm is thought to provide important signals for axis formation and neural differentiation in vertebrate embryos. We have examined induction and patterning in a zebrafish mutant, no tail, that lacks a derivative of dorsal mesoderm, the notochord. Despite the absence of a differentiated notochord, development of the central nervous system including floor plate appears normal, likely owing to the presence of notochord precursor cells. In contrast, somites are misshapen, and muscle pioneer cells are absent. Wild-type cells transplanted into mutant hosts can autonomously differentiate into notochord and thereby rescue somitic defects, suggesting that interactions between notochord and paraxial mesoderm are necessary for proper somite patterning. Thus, cells derived from dorsal mesoderm may have multiple signaling functions during zebrafish embryogenesis.
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