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. 1992 Dec;51(6):1396–1405.

Partial isodisomy for maternal chromosome 7 and short stature in an individual with a mutation at the COL1A2 locus.

L D Spotila 1, L Sereda 1, D J Prockop 1
PMCID: PMC1682915  PMID: 1463018

Abstract

Uniparental disomy for chromosome 7 has been described previously in two individuals with cystic fibrosis. Here, we describe a third case that was discovered because the proband was homozygous for a mutation in the COL1A2 gene for type I procollagen, although his mother was heterozygous and his father did not have the mutation. Phenotypically, the proband was similar to the two previously reported cases with uniparental disomy for chromosome 7, in that he was short in stature and growth retarded. Paternity was assessed with five polymorphic markers. Chromosome 7 inheritance in the proband was analyzed using 12 polymorphic markers distributed along the entire chromosome. Similar analysis of the proband's two brothers established the phase of the alleles at the various loci, assuming minimal recombination. The proband inherited only maternal alleles at five loci and was homozygous at all loci examined, except one. He was heterozygous for an RFLP at the IGBP-1 locus at 7p13-p12. The results suggest that the isodisomy was not complete because of a recombination event involving the proximal short arms of two maternal chromosomes. In addition, the phenotype of proportional dwarfism in the proband suggests imprinting of one or more growth-related genes on chromosome 7.

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