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The gene for Machado-Joseph disease maps to human chromosome 14q
Y Takiyama1, M Nishizawa, H Tanaka
1Department of Neurology, Jichi Medical School, Tochigi, Japan.
Abstract:
Machado-Joseph disease (MJD) is an autosomal dominant, multisystem neurodegenerative disorder involving predominantly cerebellar, pyramidal, extrapyramidal, motor neuron and oculomotor systems. Although it was first reported in families of Portuguese-Azorean descent, MJD has also been described in non-Azorean families from various countries, being one of the most common hereditary spinocerebellar degenerations. With the use of highly polymorphic microsatellite DNA polymorphisms, we have assigned the gene for MJD to the long arm of chromosome 14 (14q24.3-q32) by genetic linkage to microsatellite loci D14S55 and D14S48 (multipoint lod score Zmax = 9.719).
Insights
Machado-Joseph disease (MJD), a common hereditary neurodegenerative disorder, has its gene located on chromosome 14. This finding aids in understanding MJD
Area of Science:
- Genetics
- Neuroscience
- Molecular Biology
Background:
- Machado-Joseph disease (MJD) is a prevalent, autosomal dominant, multisystem neurodegenerative disorder.
- It affects cerebellar, pyramidal, extrapyramidal, motor neuron, and oculomotor systems.
- MJD, initially reported in Portuguese-Azorean families, is found globally.
Purpose of the Study:
- To genetically map the Machado-Joseph disease (MJD) gene.
- To identify the chromosomal location of the MJD gene.
Main Methods:
- Utilized highly polymorphic microsatellite DNA polymorphisms.
- Employed genetic linkage analysis with microsatellite loci D14S55 and D14S48.
- Performed multipoint linkage analysis.
Main Results:
- Successfully assigned the MJD gene to chromosome 14q24.3-q32.
- Achieved a multipoint lod score of Zmax = 9.719, confirming linkage.
- Identified specific microsatellite loci linked to the MJD gene.
Conclusions:
- The gene responsible for Machado-Joseph disease is located on the long arm of chromosome 14.
- This genetic localization is a significant step towards understanding MJD's molecular basis.
- The findings contribute to the diagnosis and research of hereditary spinocerebellar degenerations.