Friedreich's ataxia: a defect in signal transduction? 1995

J J Carvajal, and M A Pook, and K Doudney, and R Hillermann, and D Wilkes, and S al-Mahdawi, and R Williamson, and S Chamberlain
Department of Biochemistry and Molecular Genetics, St Mary's Hospital Medical School, Imperial College, London, UK.

We have previously assigned the mutation causing Friedreich's ataxia (FRDA) to 9q13 by genetic linkage and fluorescent in situ hybridization analysis, and identified recombination events which position the gene centromeric to D9S5. We report here the extension of a yeast artificial chromosome contig to span the 860 kb interval immediately proximal to this marker, which includes the D9S886 and D9S887/888 loci reported to flank the FRDA locus, and the construction of a high resolution cosmid contig initiated from the D9S888 locus. Exon trapping and cDNA library screening strategies have resulted in the isolation of a candidate gene which traverses the centromeric boundary of the FRDA critical region. The gene spans a genomic interval greater than 220 kb with at least two of the coding exons located proximal to the D9S887/888 loci. Expression is complex, with multiple transcripts detected in a variety of tissues and evidence of alternative splicing and developmental control. The predicted amino acid sequence for the 2.7 kb transcript reported here shows a marked homology to the deduced amino acid sequence of the Saccharomyces cerevisiae MSS4 protein, proposed to function within the phosphoinositide cycle, suggesting a potential role for the human homologue in signal transduction. Whilst no evidence for mutation has been detected in this transcript, the sequence represents only one of the shorter alternatively spliced species identified by Northern analysis and direct sequencing. This gene remains a strong candidate for FRDA.

UI MeSH Term Description Entries
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D011506 Proteins Linear POLYPEPTIDES that are synthesized on RIBOSOMES and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of AMINO ACIDS determines the shape the polypeptide will take, during PROTEIN FOLDING, and the function of the protein. Gene Products, Protein,Gene Proteins,Protein,Protein Gene Products,Proteins, Gene
D002874 Chromosome Mapping Any method used for determining the location of and relative distances between genes on a chromosome. Gene Mapping,Linkage Mapping,Genome Mapping,Chromosome Mappings,Gene Mappings,Genome Mappings,Linkage Mappings,Mapping, Chromosome,Mapping, Gene,Mapping, Genome,Mapping, Linkage,Mappings, Chromosome,Mappings, Gene,Mappings, Genome,Mappings, Linkage
D002899 Chromosomes, Human, Pair 9 A specific pair of GROUP C CHROMSOMES of the human chromosome classification. Chromosome 9
D003001 Cloning, Molecular The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells. Molecular Cloning
D003360 Cosmids Plasmids containing at least one cos (cohesive-end site) of PHAGE LAMBDA. They are used as cloning vehicles. Cosmid
D005091 Exons The parts of a transcript of a split GENE remaining after the INTRONS are removed. They are spliced together to become a MESSENGER RNA or other functional RNA. Mini-Exon,Exon,Mini Exon,Mini-Exons
D005621 Friedreich Ataxia An autosomal recessive disease, usually of childhood onset, characterized pathologically by degeneration of the spinocerebellar tracts, posterior columns, and to a lesser extent the corticospinal tracts. Clinical manifestations include GAIT ATAXIA, pes cavus, speech impairment, lateral curvature of spine, rhythmic head tremor, kyphoscoliosis, congestive heart failure (secondary to a cardiomyopathy), and lower extremity weakness. Most forms of this condition are associated with a mutation in a gene on chromosome 9, at band q13, which codes for the mitochondrial protein frataxin. (From Adams et al., Principles of Neurology, 6th ed, p1081; N Engl J Med 1996 Oct 17;335(16):1169-75) The severity of Friedreich ataxia associated with expansion of GAA repeats in the first intron of the frataxin gene correlates with the number of trinucleotide repeats. (From Durr et al, N Engl J Med 1996 Oct 17;335(16):1169-75) Friedreich Disease,Hereditary Spinal Sclerosis,Sclerosis, Hereditary Spinal,Friedreich Familial Ataxia,Friedreich Hereditary Ataxia,Friedreich Hereditary Spinal Ataxia,Friedreich Spinocerebellar Ataxia,Friedreich's Ataxia,Friedreich's Disease,Friedreich's Familial Ataxia,Friedreich's Hereditary Ataxia,Friedreich's Hereditary Spinal Ataxia,Hereditary Spinal Ataxia, Friedreich,Hereditary Spinal Ataxia, Friedreich's,Ataxia, Friedreich,Ataxia, Friedreich Familial,Ataxia, Friedreich Hereditary,Ataxia, Friedreich Spinocerebellar,Ataxia, Friedreich's,Ataxia, Friedreich's Familial,Ataxia, Friedreich's Hereditary,Ataxias, Friedreich,Ataxias, Friedreich's Hereditary,Disease, Friedreich,Disease, Friedreich's,Familial Ataxia, Friedreich,Familial Ataxia, Friedreich's,Friedreich Ataxias,Friedreich's Hereditary Ataxias,Friedreichs Familial Ataxia,Friedreichs Hereditary Ataxia,Hereditary Ataxia, Friedreich,Hereditary Ataxia, Friedreich's,Hereditary Ataxias, Friedreich's,Hereditary Spinal Scleroses,Scleroses, Hereditary Spinal,Spinal Scleroses, Hereditary,Spinal Sclerosis, Hereditary,Spinocerebellar Ataxia, Friedreich
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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