Chromosomal abnormality at 6p25.1-25.3 identifies a susceptibility locus for hypothalamic hamartoma associated with epilepsy

Epilepsy Res. 2007 Jun;75(1):70-3. doi: 10.1016/j.eplepsyres.2007.04.002. Epub 2007 May 18.

Abstract

The pathogenesis of hypothalamic hamartoma (HH) associated with epilepsy is unknown. We have identified an individual with HH and refractory epilepsy exhibiting subtle dysmorphic features. High-resolution karyotype identified a duplication of the terminal end of 6p (6p25.1-25.3), confirmed by fluorescent in situ-hybridization (FISH). Copy number analysis with high-density (250K) single nucleotide polymorphism (SNP) genotyping microarrays characterized the abnormality as a series of amplified regions between 1.4 Mb and 10.2 Mb, with a small tandem deletion from 8.8 Mb to 9.7 Mb. There are 38 RefSeq genes within the duplicated regions, and no known coding sequences within the deletion. This unique patient helps identify 6p25.1-25.3 as a possible susceptibility locus for sporadic HH.

Publication types

  • Case Reports

MeSH terms

  • Child
  • Chromosome Aberrations*
  • Chromosome Disorders / complications
  • Chromosome Disorders / genetics*
  • Chromosome Disorders / pathology
  • Chromosomes, Human, Pair 6*
  • Disease Susceptibility*
  • Epilepsy / complications
  • Epilepsy / genetics*
  • Epilepsy / pathology
  • Female
  • Forkhead Transcription Factors / genetics
  • Hamartoma / complications
  • Hamartoma / genetics*
  • Hamartoma / pathology*
  • Humans
  • Hypothalamic Diseases / complications
  • Hypothalamic Diseases / genetics*
  • Hypothalamic Diseases / pathology
  • In Situ Hybridization, Fluorescence / methods
  • Magnetic Resonance Imaging
  • Microarray Analysis
  • Polymorphism, Single Nucleotide

Substances

  • FOXC1 protein, human
  • Forkhead Transcription Factors