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Biochem Genet
1994 Oct 01;329-10:351-60. doi: 10.1007/bf02426897.
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Cloning of rat homeobox genes.
Sakoyama Y
,
Mizuta I
,
Ogasawara N
,
Yoshikawa H
.
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We report the isolation of nine rat cognates of mouse homeoboxes within the four Hox gene clusters and a rat homologue of mouse IPF1 homeobox, RHbox#13A. The sequences of nine cloned homeoboxes are highly similar to those of the mouse and human homeoboxes in the Hox clusters. The restriction enzyme sites and map distances between each of the homeoboxes on the rat genome are nearly identical to those of mouse and human. Thus, we conclude that the isolated homeoboxes are the rat homologues of mouse homeoboxes within the four Hox clusters. A novel homeobox RHbox#13A is different from the Drosophila Antennapedia (Antp) sequence but is highly similar to the XlHbox8 (Xenopus laevis) and HtrA2 (Helobdella triserialis) homeoboxes. Forty-two amino acids of the last two-thirds of the RHbox#13A, XlHbox8, and mouse IPF1 homeodomains completely matched. In addition, these four homeodomains contain a unique His residue in the recognition helix of a helix-turn-helix DNA-binding motif. This His residue is not found in any of the previously published mammalian homeodomain sequences except mouse IPF1.
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