0000000000266336

AUTHOR

Giuseppe De Michele

showing 3 related works from this author

Early-onset ataxia with cardiomyopathy and retained tendon reflexes maps to the friedreich's ataxia locus on chromosome 9q

1995

Absence of lower limb tendon reflexes has been considered an essential diagnostic criterion for Friedreich's ataxia (FA). However, preservation of knee and ankle jerks has been reported in a few patients. Linkage analysis to FA locus (FRDA) on chromosome 9q13-21.1 was performed in 11 patients from 6 families with FA phenotype, including cardiomyopathy, but retained reflexes (FARR). A maximal lod score of 3.38 at recombination fraction theta equal to 0.00 was obtained demonstrating that FARR maps to the FRDA locus. These results suggest that FARR is a variant phenotype of FA.

Pathologymedicine.medical_specialtyAtaxiaCardiomyopathyLocus (genetics)Biologymedicine.diseaseTendon reflexCentral nervous system diseaseDegenerative diseaseAtrophymedicine.anatomical_structureNeurologyGenetic linkagemedicineNeurology (clinical)medicine.symptomAnnals of Neurology
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Friedreich's Ataxia: Autosomal Recessive Disease Caused by an Intronic GAA Triplet Repeat Expansion

1996

International audience; Friedreich's ataxia (FRDA) is an autosomal recessive, degenerative disease that involves the central and peripheral nervous systems and the heart. A gene, X25, was identified in the critical region for the FRDA locus on chromosome 9q13. This gene encodes a 210-amino acid protein, frataxin, that has homologs in distant species such as Caenorhabditis elegans and yeast. A few FRDA patients were found to have point mutations in X25, but the majority were homozygous for an unstable GAA trinucleotide expansion in the first X25 intron.

MaleIron-sulfur cluster assemblyPolymerase Chain Reaction0302 clinical medicineTrinucleotide RepeatsIron-Binding ProteinsGenetics0303 health sciencesMultidisciplinaryAutosomal recessive cerebellar ataxiaPedigree3. Good healthFemalemedicine.symptomChromosomes Human Pair 9HumanPair 9Heterozygotecongenital hereditary and neonatal diseases and abnormalitiesAtaxiaMolecular Sequence DataGenes RecessiveLocus (genetics)BiologyChromosomes03 medical and health sciencesGene mappingAlleles; Amino Acid Sequence; Base Sequence; Chromosomes Human Pair 9; DNA Primers; Female; Friedreich Ataxia; Genes Recessive; Heterozygote; Humans; Male; Molecular Sequence Data; Pedigree; Point Mutation; Polymerase Chain Reaction; Proteins; Sequence Alignment; Introns; Iron-Binding Proteins; Trinucleotide RepeatsmedicineRecessiveHumansPoint MutationAmino Acid SequenceAlleleAllelesDNA Primers030304 developmental biologyBase SequencePoint mutationProteins[SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry Molecular Biology/Molecular biologymedicine.diseaseMolecular biologyIntronsGenes[SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human geneticsFriedreich AtaxiaFrataxinbiology.proteinSequence Alignment030217 neurology & neurosurgeryScience
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Familial hemiplegic migraine type 2 is linked to 0.9Mb region on chromosome 1q23

2003

Familial hemiplegic migraine (FHM) is a rare autosomal dominant disorder characterized by episodes of transient hemiparesis followed by headache. Two chromosomal loci are associated to FHM: FHM1 on chromosome 19 and FHM2 on chromosome 1q21-23. Mutations of the alpha-1A subunit of the voltage gated calcium channel (CACNA1A) are responsible for FHM1. FHM2 critical region spans 28 cM, hence hampering the identification of the responsible gene. Here, we report the FHM2 locus refining by linkage analysis on two large Italian families affected by pure FHM. The new critical region covers a small area of 0.9Mb in 1q23 and renders feasible a positional candidate approach. By mutation analysis, we ex…

AdultMaleAdolescentGenetic LinkageMigraine with AuraLocus (genetics)Genetic determinismGenetic linkageATP1A2Chromosome 19HumansMedicineChildFamilial hemiplegic migraineAgedAged 80 and overGeneticsbusiness.industryChromosome MappingChromosomeMiddle Agedmedicine.diseasePedigreeNeurologyChromosomes Human Pair 1MutationMutation testingFemaleNeurology (clinical)Lod ScorebusinessNeuroscienceAnnals of Neurology
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