PMID:8102800

Citation	Dollé, P, Lufkin, T, Krumlauf, R, Mark, M, Duboule, D and Chambon, P (1993) Local alterations of Krox-20 and Hox gene expression in the hindbrain suggest lack of rhombomeres 4 and 5 in homozygote null Hoxa-1 (Hox-1.6) mutant embryos. Proc. Natl. Acad. Sci. U.S.A. 90:7666-70
Abstract	It is unknown whether cross-regulatory interactions between homeotic genes, which have been shown to play an important role in the maintenance of their expression domains during Drosophila development, are also important during mammalian development. We have analyzed here the expression of Hox genes in Hoxa-1 (Hox-1.6) null mutant embryos to investigate the possible existence of regulatory interactions between Hoxa-1 and other Hox genes. We show that the absence of a functional Hoxa-1 gene product does not globally interfere with the expression of other Hox genes in terms of both spatial boundaries and transcript abundance. However, a limited area of the hindbrain shows a strong reduction in Hoxb-1 (Hox-2.9) and Krox-20 transcripts, which most likely reflects a marked reduction in size of the former fourth and fifth rhombomeres. These alterations coincide with the region that is subsequently affected in Hoxa-1 null mutant mice and suggest that the primary defects in this mutation are spatially restricted deletions of some rhombomeric structures.
Links	PubMed PMC47203
Keywords	Animals; Crosses, Genetic; DNA-Binding Proteins/genetics; Early Growth Response Protein 1; Embryo, Mammalian/physiology; Embryonic and Fetal Development; Gene Expression Regulation; Genes, Homeobox; Homozygote; Immediate-Early Proteins; In Situ Hybridization; Mice; Mice, Mutant Strains; Models, Genetic; Models, Neurological; Rhombencephalon/physiology; Transcription Factors/genetics; Transcription, Genetic; Zinc Fingers/genetics
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