Chromosomal abnormality at 6p25.1-25.3 identifies a susceptibility locus for hypothalamic hamartoma associated with epilepsy.
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.
Kerrigan
John F
JF
Epilepsy Center and Division of Pediatric Neurology, Barrow Neurological Institute and Children's Health Center, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, USA. jkerrigan@chw.edu
Kruer
Michael C
MC
Corneveaux
Jason
J
Panganiban
Corrie B
CB
Itty
Abraham
A
Reiman
David
D
Ng
Yu-Tze
YT
Stephan
Dietrich A
DA
Craig
David W
DW
D002648:Child; D002869:Chromosome Aberrations; D025063:Chromosome Disorders / Q000150:complications / Q000235:genetics* / Q000473:pathology; D002896:Chromosomes, Human, Pair 6; D004198:Disease Susceptibility; D004827:Epilepsy / Q000150:complications / Q000235:genetics* / Q000473:pathology; D005260:Female; D051858:Forkhead Transcription Factors / Q000235:genetics; D006222:Hamartoma / Q000150:complications / Q000235:genetics* / Q000473:pathology*; D006801:Humans; D007027:Hypothalamic Diseases / Q000150:complications / Q000235:genetics* / Q000473:pathology; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D008279:Magnetic Resonance Imaging; D046228:Microarray Analysis; D020641:Polymorphism, Single Nucleotide
C112743:FOXC1 protein, human; D051858:Forkhead Transcription Factors