Biomaterial Database

Spinocerebellar ataxia type 1. 1995

H Y Zoghbi, and H T Orr

Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA.

Spinocerebellar ataxia type 1 (SCA1) is a dominantly inherited neurodegenerative disorder characterized by ataxia, dysarthria and progressive bulbar dysfunction. The SCA 1 gene which maps to the short arm of chromosome 6 has been isolated using a positional cloning approach. The SCA1 transcript is 10660 bases and encodes a novel protein, ataxin-1, with a predicted molecular weight of 87 kDa. Expansion of a CAG repeat localized near the amino terminus of ataxin-1 has been found to be the mutational mechanism in SCA1. This CAG repeat is highly polymorphic with normal alleles containing 6-39 repeats. Individuals affected with SCA1 have one normal allele and one expanded allele containing 40-81 repeats. The size of the repeat correlates inversely with the age of onset of symptoms and the severity of disease. The repeat is a continuous CAG repeat tract on SCA1 chromosomes whereas in > or = 98% of normal alleles one or more CAT interruptions break the CAG repeat tracts into two tracts containing less than 18 repeats each. This suggests that loss of CAT interruptions within the SCA1 CAG repeat on normal chromosomes leads to triplet instability.

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
D012091	Repetitive Sequences, Nucleic Acid	Sequences of DNA or RNA that occur in multiple copies. There are several types: INTERSPERSED REPETITIVE SEQUENCES are copies of transposable elements (DNA TRANSPOSABLE ELEMENTS or RETROELEMENTS) dispersed throughout the genome. TERMINAL REPEAT SEQUENCES flank both ends of another sequence, for example, the long terminal repeats (LTRs) on RETROVIRUSES. Variations may be direct repeats, those occurring in the same direction, or inverted repeats, those opposite to each other in direction. TANDEM REPEAT SEQUENCES are copies which lie adjacent to each other, direct or inverted (INVERTED REPEAT SEQUENCES).	DNA Repetitious Region,Direct Repeat,Genes, Selfish,Nucleic Acid Repetitive Sequences,Repetitive Region,Selfish DNA,Selfish Genes,DNA, Selfish,Repetitious Region, DNA,Repetitive Sequence,DNA Repetitious Regions,DNAs, Selfish,Direct Repeats,Gene, Selfish,Repeat, Direct,Repeats, Direct,Repetitious Regions, DNA,Repetitive Regions,Repetitive Sequences,Selfish DNAs,Selfish 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
D004247	DNA	A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).	DNA, Double-Stranded,Deoxyribonucleic Acid,ds-DNA,DNA, Double Stranded,Double-Stranded DNA,ds DNA
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001483	Base Sequence	The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.	DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D013132	Spinocerebellar Degenerations	A heterogenous group of degenerative syndromes marked by progressive cerebellar dysfunction either in isolation or combined with other neurologic manifestations. Sporadic and inherited subtypes occur. Inheritance patterns include autosomal dominant, autosomal recessive, and X-linked.	Ataxias, Hereditary,Cerebellar Ataxia, Early Onset,Cerebellar Ataxia, Late Onset,Cerebellar Degenerations, Primary,Corticostriatal-Spinal Degeneration,Marie Cerebellar Ataxia,Marinesco-Sjogren Syndrome,Spinocerebellar Degeneration,Early Onset Cerebellar Ataxia,Familial Spinocerebellar Degenerations,Garland-Moorhouse Syndrome,Hereditary Oligophrenic Cerebello-Lental Degeneration,Hereditary Spinocerebellar Degenerations,Inherited Spinocerebellar Degenerations,Late Onset Cerebellar Ataxia,Marie's Cerebellar Ataxia,Marinesco-Garland Syndrome,Marinesco-Sjogren Syndrome-Hypergonadotrophic Hypogonadism,Marinesco-Sjogren Syndrome-Myopathy,Marinesco-Sjogren-Garland Syndrome,Marinesco-Sjögren Syndrome,Spino Cerebellar Degenerations,Spino-Cerebellar Degenerations,Spinocerebellar Diseases,Ataxia, Hereditary,Cerebellar Ataxia, Marie,Cerebellar Ataxia, Marie's,Cerebellar Degeneration, Primary,Corticostriatal Spinal Degeneration,Corticostriatal-Spinal Degenerations,Degeneration, Corticostriatal-Spinal,Degeneration, Familial Spinocerebellar,Degeneration, Hereditary Spinocerebellar,Degeneration, Inherited Spinocerebellar,Degeneration, Primary Cerebellar,Degeneration, Spino Cerebellar,Degeneration, Spino-Cerebellar,Degeneration, Spinocerebellar,Degenerations, Corticostriatal-Spinal,Degenerations, Familial Spinocerebellar,Degenerations, Hereditary Spinocerebellar,Degenerations, Inherited Spinocerebellar,Degenerations, Primary Cerebellar,Degenerations, Spino Cerebellar,Degenerations, Spinocerebellar,Familial Spinocerebellar Degeneration,Garland Moorhouse Syndrome,Hereditary Ataxia,Hereditary Ataxias,Hereditary Oligophrenic Cerebello Lental Degeneration,Hereditary Spinocerebellar Degeneration,Hypogonadism, Marinesco-Sjogren Syndrome-Hypergonadotrophic,Inherited Spinocerebellar Degeneration,Marinesco Garland Syndrome,Marinesco Sjogren Garland Syndrome,Marinesco Sjogren Syndrome,Marinesco Sjogren Syndrome Hypergonadotrophic Hypogonadism,Marinesco Sjogren Syndrome Myopathy,Marinesco Sjögren Syndrome,Primary Cerebellar Degeneration,Primary Cerebellar Degenerations,Spino Cerebellar Degeneration,Spino-Cerebellar Degeneration,Spinocerebellar Degeneration, Familial,Spinocerebellar Degeneration, Hereditary,Spinocerebellar Degeneration, Inherited,Spinocerebellar Degenerations, Familial,Spinocerebellar Degenerations, Hereditary,Spinocerebellar Degenerations, Inherited,Spinocerebellar Disease,Syndrome, Garland-Moorhouse,Syndrome, Marinesco-Garland,Syndrome, Marinesco-Sjogren,Syndrome, Marinesco-Sjogren-Garland,Syndrome, Marinesco-Sjögren,Syndrome-Hypergonadotrophic Hypogonadism, Marinesco-Sjogren,Syndrome-Myopathy, Marinesco-Sjogren