Recurrent mutations in DNAJC5 cause autosomal dominant Kufs disease

Topic: Brain proteins, microglia and lab models

We sought to identify the molecular basis of the autosomal dominant form of Kufs disease, an adult onset form of neuronal ceroid lipofuscinosis. We used a combination of classic linkage analysis and Next Generation Sequencing to map and identify mutations in DNAJC5 in a total of three families. We analyzed the clinical manifestations in 20 individuals with mutation in DNAJC5. We report here the mapping and the identification of a p.L116del mutation in DNAJC5 segregating with the disease in two distinct American families, as well as a p.L115R mutation in an additional family. The age of onset and clinical manifestations were very homogeneous among mutation positive individuals, including generalized tonic-clonic seizures, myoclonus, ataxia, speech deterioration, dementia, and premature death. A few individuals also exhibited parkinsonism. DNAJC5, which encodes the cysteine string protein (CSPα), a presynaptic protein implicated in neurodegeneration, causes autosomal dominant Kufs disease. The leucine residues at positions 115 and 116 are hotspots for mutations and result in a homogeneous phenotype of progressive myoclonus epilepsy with onset around 30 years old.

@article{cadieuxdion2013-22978711,
  author  = {Cadieux-Dion, M. and Andermann, E. and Lachance-Touchette, P. and Ansorge, O. and Meloche, C. and Barnabé, A. and Kuzniecky, R. I. and Andermann, F. and others},
  title   = {{Recurrent mutations in DNAJC5 cause autosomal dominant Kufs disease}},
  journal = {Clinical genetics},
  year    = {2013},
  doi     = {10.1111/cge.12020},
  pmid    = {22978711},
  url     = {https://doi.org/10.1111/cge.12020}
}

Key findings

• The leucine residues at positions 115 and 116 are hotspots for mutations and result in a homogeneous phenotype of progressive myoclonus epilepsy with onset around 30 years old.

Why it matters

This study found that mutations in the DNAJC5 gene cause an inherited form of Kufs disease, which includes dementia among its symptoms, with onset around age 30. It identifies a genetic cause of a rare disease and does not test any treatment or prevention for Alzheimer's disease.

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Study details

• Participants20
• Evidence strengthLow

Read the original

• DOI: 10.1111/cge.12020
• PubMed: 22978711
• Original source →

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