Abstract
The murine genome contains at least 30 sequences related to the Drosophila Antennapedia homeobox. The so-called Hox genes are clustered in four complexes conserved throughout vertebrate evolution1–5, and accumulating evidence shows that these genes are expressed during ontogenesis in a coordinated manner3,6–8 and may be involved in a regulatory network controlling vertebrate morphogenesis. Retinoic acid (RA) or related retinoid derivatives are candidates for crucial signalling molecules involved in vertebrate morphogenetic processes and/or pattern formation as best exemplified by the developing and regenerating limb system (reviewed in refs. 9,10). RA can interfere very specifically with anteroposterior (A-P) patterning in the chick wing bud 11 and is believed to be a natural morphogen released as a concentration gradient from a discrete posterior area, the zone of polarizing activity (ZPA)12. RA can also disturb positional information in the regenerating amphibian limb13,14 The molecular basis of RA activity involves its binding to a cellular RA binding protein (CRABP) 15 and/or to an appropriate nuclear RA receptors (RARs). An increasing number of such RA receptors are being characterized and all of them are ligand-inducible transcription factors belonging to the steroid hormones receptors family16–19. There is increasing evidence that in cultured cells, RA regulates the steady state level of Hox genes messenger RNAs though the transcriptional or post-transcriptional nature of this regulation is not yet clearly established (see e.g. ref.20). In addition, the human Hox-2 genes respond to RA treatment, in teratocarcinoma cell lines, in a way related to their respective positions within the Hox-2 complex21. The molecular mechanism involved in such a colinear response is not known but probably parallels those regulating the expression of these genes during ontogenesis. Using the vertebrate limb development as a model system, we would like to discuss here some circumstantial evidence that RA, RARs and Hox genes may also be functionally related in vivo, in the light of recent findings concerning the expression of such genes during mouse development.
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Dollé, P., Ruberte, E., Izpisùa-Belmonte, JC., Falkenstein, H., Chambon, P., Duboule, D. (1991). A Comparison of the Expression Domains of the Murine Hox-4, RARs and CRABP Genes Suggests Possible Functional Relationships During Patterning of the Vertebrate Limb. In: Hinchliffe, J.R., Hurle, J.M., Summerbell, D. (eds) Developmental Patterning of the Vertebrate Limb. NATO ASI Series, vol 205. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3310-8_11
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