1. Loss-of-function mutations in the Nav1.7 gene underlie congenital indifference to pain in multiple human populations
- Author
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E Toscano, Generoso Andria, C Young, BG Sibley, Mark E. Samuels, Marcia L.E. MacDonald, B Payne, HB Younghusband, JH Dimon, G Donaldson, Sakiat Hossain, A Duff, Maryanne Mattice, Julie MacFarlane, Jay Thompson, D Bowsher, Simon N. Pimstone, E Boltshauser, Hayden, R Fraser, Robin Sherrington, Elizabeth Ives, J Kerdraon, Y P Goldberg, GA Grinspan, Roger C. Green, Terry D Pape, C Radomski, J Cox, M-P Dubé, Goldberg, Yp, Macfarlane, J, Macdonald, Ml, Thompson, J, Dube, Mp, Mattice, M, Fraser, R, Young, C, Hossain, S, Pape, T, Payne, B, Radomski, C, Donaldson, G, Ives, E, Cox, J, Younghusband, Hb, Green, R, Duff, A, Boltshauser, E, Grinspan, Ga, Dimon, Jh, Sibley, Bg, Andria, Generoso, Toscano, E, Kerdraon, J, Bowsher, D, Pimstone, Sn, Samuels, Me, Sherrington, R, and Hayden, Mr
- Subjects
Male ,Pain Insensitivity, Congenital ,Population ,DNA Mutational Analysis ,Locus (genetics) ,Biology ,Sodium Channels ,Genetics ,Paroxysmal extreme pain disorder ,medicine ,Humans ,education ,Frameshift Mutation ,Gene ,Genetics (clinical) ,Loss function ,Sequence Deletion ,education.field_of_study ,NAV1.7 Voltage-Gated Sodium Channel ,Chromosome Mapping ,medicine.disease ,Disease gene identification ,Founder Effect ,Pedigree ,Genetics, Population ,Haplotypes ,Codon, Nonsense ,Chromosomes, Human, Pair 2 ,Mutation ,Female ,SCN9A Gene ,Congenital insensitivity to pain - Abstract
Congenital indifference to pain (CIP) is a rare condition in which patients have severely impaired pain perception, but are otherwise essentially normal. We identified and collected DNA from individuals from nine families of seven different nationalities in which the affected individuals meet the diagnostic criteria for CIP. Using homozygosity mapping and haplotype sharing methods, we narrowed the CIP locus to chromosome 2q24-q31, a region known to contain a cluster of voltage-gated sodium channel genes. From these prioritized candidate sodium channels, we identified 10 mutations in the SCN9A gene encoding the sodium channel protein Na v 1.7. The mutations completely co-segregated with the disease phenotype, and nine of these SCN9A mutations resulted in truncation and loss-of-function of the Na v 1.7 channel. These genetic data further support the evidence that Na v 1.7 plays an essential role in mediating pain in humans, and that SCN9A mutations identified in multiple different populations underlie CIP.
- Published
- 2007