{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T19:34:12Z","timestamp":1760384052813},"reference-count":52,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2002,10,23]],"date-time":"2002-10-23T00:00:00Z","timestamp":1035331200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Teratology"],"published-print":{"date-parts":[[2002,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Phocomelia, which is primarily due to a disruption in the proximodistal axis, is found in virtually all mouse embryos exposed to high doses of retinoic acid (RA) on 11 days post coitum (dpc).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>To identify genes that potentially mediate the effects of retinoic acid (RA) on limb development, we have examined the expression of 9,000 clones from the IMAGE consortium by microarray analysis of RNA isolated from 11 dpc mouse forelimbs exposed to RA or vehicle for 6 hr. Eight genes that demonstrated altered expression were chosen for further study of their mRNA levels using RT\u2010PCR. Protein levels were determined by Western blot analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of the 9,000 genes examined in the microarray, approximately 111 demonstrated altered expression (33 known genes and 78 ESTs). Of the eight known genes chosen for further study using RT\u2010PCR, four mRNAs (PBX1a, PBX1b, IGF\u2010Ia, and IGF\u2010Ib) demonstrated consistent elevation (\u22483\u2010fold) in their levels after RA treatment in both the forelimbs and hindlimbs as early as 3 hr after RA treatment. In addition to the two PBX1 isoforms, the mRNA level of the other two subtypes (PBX2 and PBX3) and the level of PBX1\/2\/3 protein were also found to be elevated in limb buds after RA treatment. Finally, we examined the expression of MEIS1, MEIS2, and MEIS3 because these proteins are necessary for PBX nuclear localization. The mRNA level of all three subtypes of MEIS were elevated approximately three\u2010 to four\u2010fold in both the forelimbs and hindlimbs after RA treatment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Because both PBX and MEIS (and their orthologs) are believed to be involved in the control of proximodistal axis formation in mouse and fly limbs and IGFs in the development of limbs, we suggest that increases in PBX, MEIS and IGF\u20101 mRNA levels may contribute to proximodistal limb reduction defects caused by teratogenic doses of RA. 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