ZFIN ID: ZDB-PUB-961014-1055
Hox gene expression in teleost fins and the origin of vertebrate digits
Sordino, P., van der Hoeven, F., and Duboule, D.
Date: 1995
Source: Nature   375: 678-681 (Journal)
Registered Authors: Duboule, Denis, Sordino, Paolo
Keywords: none
MeSH Terms:
  • Animals
  • Biological Evolution*
  • Extremities/embryology*
  • Forelimb/embryology
  • Gene Expression*
  • Genes, Homeobox*
  • Hedgehog Proteins
  • Hindlimb/embryology
  • Homeodomain Proteins
  • Mesoderm
  • Mice
  • Morphogenesis
  • Proteins/genetics
  • Trans-Activators/genetics
  • Vertebrates/embryology*
  • Vertebrates/genetics
  • Zebrafish/embryology*
  • Zebrafish/genetics
PubMed: 7791900 Full text @ Nature
Hox genes are essential for growth and patterning of the tetrapod limb skeleton. Mice mutant for the Hoxd-13 gene have an important delay in morphogenesis owing to reduced proliferation. Based on the appearance of atavisms in such mice, we suggested that modifications of Hox gene regulation may have been a source of morphological variation during the evolution of tetrapod limbs. Pectoral and pelvic fins are homologous to fore- and hindlimbs, respectively. To compare the relative importance of Hox genes during fin versus limb morphogenesis, we cloned zebrafish (Danio rerio) HoxD and HoxA complex genes and analysed their expression during fin development. The results suggest a scheme for the fin-limb transition in which the distal autopods (digits) are neomorphic structures produced by unequal proliferation of the posterior part of an ancestral appendix.