Expression of a novel type of classic cadherin, PB-cadherin in developing brain and limb buds.
PB-cadherin is a novel classic type of cadherin predominantly expressed in brain of adult rats (Sugimoto et al. [1996] J. Biol. Chem. 271:11548-11556). To examine the spatial and temporal expression of PB-cadherin during development, we isolated full-length cDNA of mouse PB-cadherin and studied its expression pattern in mouse embryos. In Northern blots, PB-cadherin mRNA was detected at 9.5 days postcoitum (dpc) onwards. Whole-mount in situ hybridization showed that PB-cadherin signals mainly occurred in developing neural tissues, including brain and spinal cord, and limb buds in the 10.5 dpc embryo. In the brain, PB-cadherin mRNA were strongly expressed in the forebrain and midbrain-hindbrain boundary region (isthmus). In isthmus, PB-cadherin expression delineated the expression area of Wnt-1, a secreted signaling molecule essential for proper cerebellum development. In the developing limb, PB-cadherin mRNA was first localized in posterior part of buds at 10.5 dpc, and was thereafter distributed in a domain around the digit rudiments. This expression pattern is similar to that of BMP-2, a secreted signalling molecule involving limb patterning and morphogenesis. These findings suggested the possibility that PB-cadherin-mediated cell-cell adhesion has a functional role in pattern formation and morphogenesis of mouse embryonic brain and limb. Dev Dyn 1999;215:206-214.
Division of Biochemistry, Biomedical Research Center, Osaka University Medical School, Osaka, Japan.
K
K
Kitajima
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U
Koshimizu
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T
Nakamura
D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000096:biosynthesis / Q000235:genetics; D001921:Brain / Q000196:embryology / Q000378:metabolism*; D015820:Cadherins / Q000096:biosynthesis* / Q000235:genetics; D002448:Cell Adhesion; D002531:Cerebellum / Q000196:embryology / Q000378:metabolism; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D005314:Embryonic and Fetal Development; D005121:Extremities / Q000196:embryology / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental; D017403:In Situ Hybridization; D008636:Mesencephalon / Q000196:embryology / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D009024:Morphogenesis; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000235:genetics; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D012249:Rhombencephalon / Q000196:embryology / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D016212:Transforming Growth Factor beta; D051153:Wnt Proteins; D051155:Wnt1 Protein; D029961:Zebrafish Proteins
C525719:Bmp2 protein, mouse; C525720:Bmp2 protein, rat; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D015820:Cadherins; C504494:Cdh22 protein, mouse; D018076:DNA, Complementary; D009419:Nerve Tissue Proteins; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D051153:Wnt Proteins; D051155:Wnt1 Protein; C495246:Wnt1 protein, mouse; D029961:Zebrafish Proteins