Expression and regulation of chicken fibroblast growth factor homologous factor (FHF)-4 at the base of the developing limbs

Citation
I. Munoz-sanjuan et al., Expression and regulation of chicken fibroblast growth factor homologous factor (FHF)-4 at the base of the developing limbs, MECH DEVEL, 95(1-2), 2000, pp. 101-112
Citations number
45
Categorie Soggetti
Cell & Developmental Biology
Journal title
MECHANISMS OF DEVELOPMENT
ISSN journal
09254773 → ACNP
Volume
95
Issue
1-2
Year of publication
2000
Pages
101 - 112
Database
ISI
SICI code
0925-4773(200007)95:1-2<101:EAROCF>2.0.ZU;2-H
Abstract
Fibroblast growth factor homologous factors (FHFs) have been implicated in limb and nervous system development. In this paper we describe the expressi on of the cFHF-4 gene during early chicken development, cFHF-4 is expressed in the paraxial mesoderm, lateral ridge, and, most prominently, in the pos terior-dorsal side of the base of each limb bud. The expression pattern of cFHF-4 at the base of the limbs is not altered by tissue grafts containing the zone of polarizing activity (ZPA), by implants of Shh-expressing cells, or by implants of beads containing retinoic acid, nor does it depend on th e distal growth of the limb as it is not altered in limb buds that are surg ically truncated. In three chicken mutants affecting limb patterning - talp id(2), limbless, and wingless - altered patterns of cFHF-4 expression are c orrelated with abnormal nerve plexus formation and altered patterns of limb bud innervation. Similarly, ectopic expression of cFHF-4 is correlated wit h a local induction of limb-like innervation patterns when beads containing FGF-2 are implanted in the flank. In these experiments, both ectopic inner vation and ectopic expression of cFHF-4 in the flank were observed regardle ss of the size of the FGF-2-induced outgrowths. By contrast, ectopic expres sion of Shh and HoxD13 are seen only in the larger FGF-2-induced outgrowths . Taken together, these data suggest that cFHF-4 regulates or is coregulate d with early events related to innervation at the base of the limbs. (C) 20 00 Elsevier Science Ireland Ltd. All rights reserved.