Abstract
Murine Hoxd-3 (Hox 4.1) genomic DNA and cDNA and Hoxa-3 (Hox 1.5) cDNA were cloned and sequenced. The homeodomains of Hoxd-3 and Hoxa-3 and regions before and after the homeodomain are highly conserved. Both Hoxa-3 and Hoxa-3 proteins have a proline-rich region that contains consensus amino acid sequences for binding to Src homology 3 domains of some signal transduction proteins. Northern blot analysis of RNA from 8- to 11-day-old mouse embryos revealed a 4.3-kb species of Hoxd-3 RNA, whereas a less abundant 3.0-kb species of Hoxd-3 RNA was found in RNA from 9- to 11-day-old embryos. Two species of Hoxd-3 poly(A)+ RNA, 4.3 and 6.0 kb in length, were found in poly(A)+ RNA from adult mouse kidney, but not in RNA from other adult tissues tested. Hoxd-3 mRNA was detected by in situ hybridization in 12-, 14-, and 17-day-old mouse embryos in the posterior half of the myelencephalon, spinal cord, dorsal root ganglia, first cervical vertebra, thyroid gland, kidney tubules, esophagus, stomach, and intestines.
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