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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

GHox-7: a chicken homeobox-containing gene expressed in a fashion consistent with a role in patterning events during embryonic chick limb development.

Homeobox-containing ( HOX) genes are thought to be involved in the regulation of pattern formation and specification of positional information during vertebrate limb development. We report the isolation from a chick limb bud cDNA library of several overlapping chicken HOX cDNAs, which on the basis of their nucleotide and deduced amino acid sequences have been identified as corresponding to the chicken cognate of mouse Hox-7. 1. The gene encoding these chicken (Gallus) HOX cDNAs has been designated GHox-7, and is a member of a family of vertebrate HOX genes that are highly similar in sequence to the Drosophila msh gene. GHox-7 encodes an mRNA transcripts of about 1.8-2.0 kb that is expressed at early stages of chick limb development. In situ hybridization analysis has revealed that GHox-7 is expressed in limb bud mesoderm in a temporal and spatial fashion. This is consistent with its involvement in specifying anterior positional identity and/or in the response of limb mesenchymal cells to the apical ectodermal ridge (AER), which directs polarized proximodistal limb outgrowth. At early stages (stages 20-21) of chick limb development when positional values along the anterior-posterior (A-P) axis are being specified, GHox-7 exhibits an asymmetric arc of expression extending from the anterior border of the limb bud to the mesenchymal cells directly subjacent to the AER.(ABSTRACT TRUNCATED AT 250 WORDS)[1]


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