Genetic analysis of SS18L1 in French amyotrophic lateral sclerosis

Neurobiol Aging. 2014 May;35(5):1213.e9-1213.e12. doi: 10.1016/j.neurobiolaging.2013.11.023. Epub 2013 Dec 3.

Abstract

Amyotrophic lateral sclerosis (ALS) is a devastating motor neuron disease including about 15% of genetically determined forms. A de novo mutation in the SS18L1 (also known as CREST or KIAA0693) gene encoding the calcium-responsive transactivator and/or neuronal chromatin remodeling complex subunit has recently been identified by exome sequencing of 47 sporadic ALS trios. This Q388stop mutation deleting the last 9 amino acids was shown to impair activity-dependent dendritic outgrowth. A missense mutation (c.369T>G, p.Ileu123Met) was also found in 1 of 62 ALS families previously screened for other ALS-related genes and not carrying any mutation. To confirm the contribution of SS18L1 to ALS, we sequenced the 11 coding exons and exon-intron boundaries in 87 familial ALS (FALS). We identified 2 variants: the c.660_668del, p.Gln222_Ser224del in a patient devoid of mutation in any ALS related genes and the c.790G>A, p.Ala264Thr in a patient carrying a p.Arg96Leu variant in the OPTN gene. As these variants were not found in Single Nucleotide Polymorphism databases and were absent from 180 controls they could be new SS18L1 mutations causing ALS.

Keywords: Amyotrophic lateral sclerosis; CREST; Double mutant; Familial ALS; Genetic analysis; Motor neuron disease; OPTN.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Amyotrophic Lateral Sclerosis / genetics*
  • Animals
  • Base Sequence
  • Cell Cycle Proteins
  • Chickens
  • Dendrites / physiology
  • Exons / genetics
  • France
  • Genetic Variation
  • Humans
  • Macaca mulatta
  • Membrane Transport Proteins
  • Mice
  • Molecular Sequence Data
  • Mutation*
  • Rats
  • Trans-Activators / genetics*
  • Transcription Factor TFIIIA / genetics
  • White People

Substances

  • Cell Cycle Proteins
  • Membrane Transport Proteins
  • OPTN protein, human
  • SS18L1 protein, human
  • Trans-Activators
  • Transcription Factor TFIIIA