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Results for “Polydactyly”

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At least 469 records · Page 26Linked to original sources
PubMed1993

Central nervous system alterations in a case of short-rib polydactyly syndrome, Majewski type.

The authors present a case of CNS abnormalities in a female newborn infant with Majewski syndrome. On examination the gyri were found to be normal, but there was narrowing of the corpus callosum and fornix, and dilated ventricles. A vermis hypoplasia and an arachnoid cyst were found between the cerebellar hemispheres. Cross-section of the cervical and thoracic segments revealed a flattened spinal cord in the sagittal section. There were reactive astrocytes and heterotopic ganglion cells in the white matter and isolated hypoxically damaged nerve-cells in the subiculum and nuclear masses of the brainstem. These findings are discussed with reference to the literature.

Brain↗
PubMed1995

Absence/hypoplasia of tibia, polydactyly, retrocerebellar arachnoid cyst, and other anomalies: an autosomal recessive disorder.

Absence or hypoplasia of the tibia has been reported to occur as an isolated hereditary malformation as well as a feature of several autosomal recessive and autosomal dominant syndromes. We report three sibs with absence or hypoplasia of the tibia in association with other malformations whose parents are first cousins once removed. These infants appear to have a "new" autosomal recessive syndrome.

Abnormalities, Multiple↗
PubMed1995

Postaxial polydactyly in forelimbs of CRABP-II mutant mice.

The cytoplasmic retinoic acid (RA)-binding protein CRABP-II is expressed widely throughout early morphogenesis in mouse embryo, but its expression becomes more restricted as organogenesis progresses. CRABP-II expression remains strong in the developing limb bud suggesting a role for this protein in limb patterning. Here, we show that the CRABP-II promoter can direct expression of a lacZ transgene in a specific posterior domain during limb bud development. In order to investigate in more detail the role played by CRABP-II in RA signal transduction, we have also generated mice homozygous for a null mutation of this gene. CRABPII-/- mice are viable and fertile but show a developmental defect of the forelimb, specifically an additional, postaxial digit. This digit is generally, but not exclusively, limited to a single forepaw of an individual animal. The penetrance of the phenotype varies according to the genetic background, occurring most frequently on the inbred 129Sv background (50%), less frequently on the C57Bl/6 background (30%) and rarely on the outbred CD1 background (10%). This developmental abnormality implies a role for CRABP-II in normal patterning of the limb.

Animals↗
PubMed1995

Effects of all-trans-retinoic acid on limb development in the genetic polydactyly mouse.

Pdn/+ female mice, mated with Pdn/+ males, were treated with 40 mg/kg body weight of all-trans-retinoic acid (RA) intraperitoneally on day 10 or 11 of gestation, and effects on the limb development were investigated. RA treatment induced the shortening of stylopodium and zygopodium. In the present experiment, we focused on the differences between genotypes in the shortening of stylopodium and zygopodium induced by RA. The effects of RA were milder in Pdn/Pdn than +/- (Pdn/+ and/or +/+) fetuses. The differences between genotypes in the effects of RA were more significant in the group treated on day 11 than on day 10 of gestation. Cartilage of stylopodium and zygopodium was longer in day-13 Pdn/Pdn embryos exposed to RA on day 11 of gestation than those in similarly treated +/- embryos. Many apoptotic cells were observed in the mesenchyme of the forelimb plates at 12 hr after injection of RA on day 11 of gestation. These results suggest that the Pdn gene might influence the apoptosis induced by RA in the mesenchymal cells of the limb, causing milder effects in the shortening of stylopodium and zygopodium in Pdn/Pdn fetuses.

Animals↗
PubMed1996

Polydactyly.

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Humans↗