PubMed · 1699208
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H Y Zoghbi, A E McCall. 1990-10-11. BclI and MspI polymorphisms at the D6S90 locus.. https://doi.org/10.1093/nar%2F18.19.5922
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Hereditary hydronephrosis (MIM 143400) is an autosomal dominant trait that causes unilateral or bilateral pelvi-ureteric junction (PUJ) obstruction. Linkage analysis was undertaken in 5 families with hereditary PUJ obstruction using the major histocompatibility complex locus as a test marker. The data as a whole supported a hereditary hydronephrosis locus on 6p. Maximal lod scores were 3.090 at a recombination fraction of 0.1 with full penetrance, and 2.486 at a recombination fraction of 0.1 with a penetrance of 90%. However, analysis of two point lod scores using the HOMOG program revealed significant evidence for genetic heterogeneity with one locus on 6p in 4 of the families, and a different locus in one family. After exclusion of this unlinked family, two point analysis gave a maximal lod score of 3.9 at a recombination fraction of 0.05 with full penetrance, and 4.2 at a recombination fraction of 0.0 with 90% penetrance. These data support the assignment of one of the loci for hereditary hydronephrosis to chromosome 6p.
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Molecular genetic research in epilepsy is most promising in the homogeneous, genetically determined forms of the disease. The phenotype-genotype strategy used makes some epileptic syndromes more suitable for such study than others. Unequivocal clinical presentation, mendelian transmission with similar clinical expression in close relatives, and sufficiently large numbers of affected families are requisites. This makes idiopathic generalized epilepsies (IGEs), particularly absence and juvenile myoclonic epilepsies (JMEs), suitable subtypes for genetic analysis. Results of family studies to date show that five IGE syndromes have a common genetic origin. Linkage studies have localized a gene defect on chromosome 6p that predisposes to a group of IGEs: JME, absence epilepsy, and generalized tonic-clonic seizures in epilepsy families with JME probands. Environmental and additional genetic factors are other areas requiring further study to elucidate the discriminant factors associated with different varieties of IGE.