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Genetic linkage and heterogeneity in type I Charcot-Marie-Tooth disease (hereditary motor and sensory neuropathy type I). 1990

P F Chance, and T D Bird, and P O'Connell, and H Lipe, and J M Lalouel, and M Leppert
Division of Medical Genetics, University of Utah Medical Center, Salt Lake City 84132.

The segregation patterns of DNA markers from the pericentromeric regions of chromosomes 1 and 17 were studied in seven pedigrees segregating an autosomal dominant gene for Charcot-Marie-Tooth neuropathy type I (CMT I; hereditary motor and sensory neuropathy I). A multilocus analysis with four markers (pMCR-3, pMUC10, FY, and pMLAJ1) spanning the pericentromeric region of chromosome 1 excluded the CMT I gene from this region in six pedigrees but gave some evidence for linkage to the region of Duffy in one pedigree. Linkage of the CMT I gene to markers in the pericentromeric region of chromosome 17 (markers pA10-41, pEW301, p3.6, and pTH17.19) was established; however, in these seven pedigrees homogeneity analysis with chromosome 17 markers detected significant genetic heterogeneity. This analysis suggested that three of the seven pedigrees are not linked to this same region. Overall, two of the seven CMT I pedigrees were not linked to markers tested from chromosomes 1 or 17. These results confirm genetic heterogeneity in CMT I and implicate the existence of a third autosomal locus, in addition to a locus on chromosome 17, and a probable locus on chromosome 1. This evidence of etiological heterogeneity, supported by statistical tests, will have to be taken into consideration when fine-structure genetic maps of the regions around CMT I are constructed.

UI MeSH Term Description Entries
D008040 Genetic Linkage The co-inheritance of two or more non-allelic GENES due to their being located more or less closely on the same CHROMOSOME. Genetic Linkage Analysis,Linkage, Genetic,Analyses, Genetic Linkage,Analysis, Genetic Linkage,Genetic Linkage Analyses,Linkage Analyses, Genetic,Linkage Analysis, Genetic
D008126 Lod Score The total relative probability, expressed on a logarithmic scale, that a linkage relationship exists among selected loci. Lod is an acronym for "logarithmic odds." Lod Scores,Score, Lod,Scores, Lod
D008297 Male Males
D010375 Pedigree The record of descent or ancestry, particularly of a particular condition or trait, indicating individual family members, their relationships, and their status with respect to the trait or condition. Family Tree,Genealogical Tree,Genealogic Tree,Genetic Identity,Identity, Genetic,Family Trees,Genealogic Trees,Genealogical Trees,Genetic Identities,Identities, Genetic,Tree, Family,Tree, Genealogic,Tree, Genealogical,Trees, Family,Trees, Genealogic,Trees, Genealogical
D002607 Charcot-Marie-Tooth Disease A hereditary motor and sensory neuropathy transmitted most often as an autosomal dominant trait and characterized by progressive distal wasting and loss of reflexes in the muscles of the legs (and occasionally involving the arms). Onset is usually in the second to fourth decade of life. This condition has been divided into two subtypes, hereditary motor and sensory neuropathy (HMSN) types I and II. HMSN I is associated with abnormal nerve conduction velocities and nerve hypertrophy, features not seen in HMSN II. (Adams et al., Principles of Neurology, 6th ed, p1343) Atrophy, Muscular, Peroneal,HMSN Type I,HMSN Type II,Hereditary Motor and Sensory-Neuropathy Type II,Hereditary Motor, and Sensory Neuropathy Type I,Muscular Atrophy, Peroneal,Peroneal Muscular Atrophy,Roussy-Levy Syndrome,Charcot-Marie Disease,Charcot-Marie-Tooth Disease, Autosomal Dominant, With Focally Folded Myelin Sheaths, Type 1A,Charcot-Marie-Tooth Disease, Autosomal Dominant, with Focally Folded Myelin Sheaths, Type 1B,Charcot-Marie-Tooth Disease, Demyelinating, Type 1A,Charcot-Marie-Tooth Disease, Demyelinating, Type 1B,Charcot-Marie-Tooth Disease, Slow Nerve Conduction Type, Linked To Duffy,Charcot-Marie-Tooth Disease, Type 1A,Charcot-Marie-Tooth Disease, Type 1B,Charcot-Marie-Tooth Disease, Type I,Charcot-Marie-Tooth Disease, Type IA,Charcot-Marie-Tooth Disease, Type IB,Charcot-Marie-Tooth Disease, Type II,Charcot-Marie-Tooth Hereditary Neuropathy,Charcot-Marie-Tooth Neuropathy, Type 1A,Charcot-Marie-Tooth Neuropathy, Type 1B,Charcot-Marie-Tooth Syndrome,HMN Distal Type I,HMSN 1A,HMSN 1B,HMSN I,HMSN IA,HMSN IB,HMSN II,HMSN1A,HMSN1B,Hereditary Areflexic Dystasia,Hereditary Motor And Sensory Neuropathy IB,Hereditary Motor and Sensory Neuropathy 1A,Hereditary Motor and Sensory Neuropathy 1B,Hereditary Motor and Sensory Neuropathy IA,Hereditary Type I Motor and Sensory Neuropathy,Neuropathy, Type I Hereditary Motor and Sensory,Neuropathy, Type II Hereditary Motor and Sensory,Roussy Levy Hereditary Areflexic Dystasia,Roussy-Levy Disease,Roussy-Levy Hereditary Areflexic Dystasia,Areflexic Dystasia, Hereditary,Areflexic Dystasias, Hereditary,Atrophies, Peroneal Muscular,Atrophy, Peroneal Muscular,Charcot Marie Disease,Charcot Marie Tooth Disease,Charcot Marie Tooth Disease, Type 1A,Charcot Marie Tooth Disease, Type 1B,Charcot Marie Tooth Disease, Type I,Charcot Marie Tooth Disease, Type IA,Charcot Marie Tooth Disease, Type IB,Charcot Marie Tooth Disease, Type II,Charcot Marie Tooth Hereditary Neuropathy,Charcot Marie Tooth Neuropathy, Type 1A,Charcot Marie Tooth Neuropathy, Type 1B,Charcot Marie Tooth Syndrome,Dystasia, Hereditary Areflexic,Dystasias, Hereditary Areflexic,Hereditary Areflexic Dystasias,Hereditary Motor and Sensory Neuropathy Type II,Hereditary Neuropathy, Charcot-Marie-Tooth,Muscular Atrophies, Peroneal,Peroneal Muscular Atrophies,Roussy Levy Disease,Roussy Levy Syndrome,Syndrome, Charcot-Marie-Tooth,Syndrome, Roussy-Levy
D002878 Chromosomes, Human, Pair 1 A specific pair of human chromosomes in group A (CHROMOSOMES, HUMAN, 1-3) of the human chromosome classification. Chromosome 1
D002886 Chromosomes, Human, Pair 17 A specific pair of GROUP E CHROMOSOMES of the human chromosome classification. Chromosome 17
D005260 Female Females
D005819 Genetic Markers A phenotypically recognizable genetic trait which can be used to identify a genetic locus, a linkage group, or a recombination event. Chromosome Markers,DNA Markers,Markers, DNA,Markers, Genetic,Genetic Marker,Marker, Genetic,Chromosome Marker,DNA Marker,Marker, Chromosome,Marker, DNA,Markers, Chromosome
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man

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