Biallelic truncating SCN9A mutation identified in four families with congenital insensitivity to pain from Pakistan

(a) Homozygosity-mapping-by-descent of four Bhakkar congenital indifference/insensitivity to pain (CIP) families. (b) Identification of mutation Met1190* in SCN9A. (c) SCN9A/NaV1.7 2D structure (as predicted by CCTOP and SMART) and approximate position of known nonsense (*) and missense (M) mutations ( www.hgmd.cf.ac.uk), as well as the Bhakkar mutation (this study) in red.

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