Germline loss-of-function mutations in LZTR1 predispose to an inherited disorder of multiple schwannomas

Nat Genet. 2014 Feb;46(2):182-7. doi: 10.1038/ng.2855. Epub 2013 Dec 22.

Abstract

Constitutional SMARCB1 mutations at 22q11.23 have been found in ∼50% of familial and <10% of sporadic schwannomatosis cases. We sequenced highly conserved regions along 22q from eight individuals with schwannomatosis whose schwannomas involved somatic loss of one copy of 22q, encompassing SMARCB1 and NF2, with a different somatic mutation of the other NF2 allele in every schwannoma but no mutation of the remaining SMARCB1 allele in blood and tumor samples. LZTR1 germline mutations were identified in seven of the eight cases. LZTR1 sequencing in 12 further cases with the same molecular signature identified 9 additional germline mutations. Loss of heterozygosity with retention of an LZTR1 mutation was present in all 25 schwannomas studied. Mutations segregated with disease in all available affected first-degree relatives, although four asymptomatic parents also carried an LZTR1 mutation. Our findings identify LZTR1 as a gene predisposing to an autosomal dominant inherited disorder of multiple schwannomas in ∼80% of 22q-related schwannomatosis cases lacking mutation in SMARCB1.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Chromosomal Proteins, Non-Histone / genetics
  • Chromosomes, Human, Pair 22 / genetics*
  • DNA, Complementary / genetics
  • DNA-Binding Proteins / genetics
  • Gene Components
  • Genes, Dominant / genetics
  • Genetic Predisposition to Disease / genetics*
  • Germ-Line Mutation / genetics*
  • Humans
  • Loss of Heterozygosity
  • Microsatellite Repeats / genetics
  • Models, Molecular*
  • Molecular Sequence Data
  • Neurilemmoma / genetics*
  • Neurofibromatosis 2 / genetics
  • Pedigree
  • Protein Conformation*
  • SMARCB1 Protein
  • Sequence Analysis, DNA
  • Transcription Factors / chemistry
  • Transcription Factors / genetics*

Substances

  • Chromosomal Proteins, Non-Histone
  • DNA, Complementary
  • DNA-Binding Proteins
  • LZTR1 protein, human
  • SMARCB1 Protein
  • SMARCB1 protein, human
  • Transcription Factors