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- W187898560 abstract "Greig syndrome is the autosomal dominant association of mild hypertelorism, variable polysyndactyly, and normal intelligence. Several families have been found to have translocations or deletions of 7p13 interrupting the normal expression of GLI3 (a zinc finger, DNA binding, transcription repressor). Recently, a mutation in the mouse homologue of GLI3 was found in the extra-toes mutant mouse (Xt). The phenotypic features of this mouse model include mild hypertelorism, postaxial polydactyly of the forelimbs, preaxial polydactyly of the hindlimbs, and variable tibial hemimelia. The homozygous mutant Xt/Xt have severe frontonasal dysplasia (FND), polysyndactyly of fore-and hindlimbs and invariable tibial hemimelia. We have recently evaluated a child with severe (type D) frontonasal dysplasia, fifth finger camptodactyly, preaxial polydactyly of one foot, and ispilateral tibial hemimelia. His father was born with a bifid nose, broad columnella, broad feet, and a two centimeter leg length discrepancy. The paternal grandmother of the proband is phenotypically normal; however, her fraternal twin died at birth with severe facial anomalies. The paternal great-grandmother of the proband is phenotypically normal however her niece was born with moderate ocular hypertelorism. This pedigree is suggestive of an autosomal dominant form of frontonasal dysplasia with variable expressivity. The phenotypic features of our casemore » more closely resemble the Xt mouse than the previously defined features of Greig syndrome in humans. This suggests that a mutation in GLI3 may be responsible for FND in this family. We are currently using polymorphic dinucleotide repeat markers flanking GLI3 in a attempt to demonstrate linkage in this pedigree. Demonstration of a GLI3 mutation in this family would broaden our view of the spectrum of phenotypes possible in Greig syndrome and could provide insight into genotype/phenotype correlation in FND.« less" @default.
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- W187898560 title "Autosomal dominant frontonasal dysplasia (atypical Greig syndrome): Lessons from the Xt mutant mouse" @default.
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