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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1992 Apr;50(4):690–699.

Maternal uniparental isodisomy of chromosome 14: association with autosomal recessive rod monochromacy.

L Pentao 1, R A Lewis 1, D H Ledbetter 1, P I Patel 1, J R Lupski 1
PMCID: PMC1682625  PMID: 1347967

Abstract

Rod monochromacy (complete congenital achromatopsia) is inherited as an autosomal recessive trait of unknown genetic location. The disorder is characterized by total absence of color discrimination because retinal cone photoreceptors do not develop; systemic features do not occur. A 20-year-old white female with rod monochromacy presented with short stature (less than 5th percentile), mild developmental delay, premature puberty, small hands and feet (length less than 5th percentile), minimal dysmorphism, and a reproductive history of three consecutive first-trimester miscarriages. Cytogenetic analysis showed 45,XX,rob(14;14) in all 30 cells examined. Southern analysis of DNA from the patient and her phenotypically normal mother and two brothers (her father is deceased) ascertained the parental origin of the 14;14 Robertsonian translocation. Analysis of RFLPs associated with nine VNTR probes and two dinucleotide repeat polymorphisms from chromosome 14 demonstrated that the patient had inherited two copies of a single allele, each of which was maternally derived. A fully informative RFLP analysis of three probes from chromosome 14 enabled reconstruction of the paternal haplotype and showed the lack of any paternal contribution to the subject. These data are consistent with maternal isodisomy for all portions of chromosome 14 tested by these markers. This finding suggests that rod monochromacy maps to chromosome 14, and it emphasizes the importance of uniparental isodisomy to provide a putative chromosomal assignment of a gene for a rare autosomal recessive disorder.

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Selected References

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