Further Validation of the SIGMAR1 c.151+1G>T Mutation as Cause of Distal Hereditary Motor Neuropathy

Child Neurology Open
Jessica J Y LeeJohn K Wu

Abstract

Distal hereditary motor neuropathies represent a group of rare genetic disorders characterized by progressive distal motor weakness without sensory loss. Their genetic heterogeneity is high and thus eligible for diagnostic whole exome sequencing. The authors report successful application of whole exome sequencing in diagnosing a second consanguineous family with distal hereditary motor neuropathy due to a homozygous c.151+1G>T variant in SIGMAR1. This variant was recently proposed as causal for the same condition in a consanguineous Chinese family. Compared to this family, the Afghan ethnic origin of our patient is distinct, yet the features are identical, validating the SIGMAR1 deficiency phenotype: progressive muscle wasting/weakness in lower and upper limbs without sensory loss. Rapid disease progression during adolescent growth is similar and may be due to SIGMAR1's role in regulating axon elongation and tau phosphorylation. Finally, the authors conclude that SIGMAR1 deficiency should be added to the differential diagnosis of distal hereditary motor neuropathies.

References

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Citations

Oct 18, 2018·Current Neurology and Neuroscience Reports·Rocio Garcia-SantibanezRobert C Bucelli
May 16, 2018·Genetics in Medicine : Official Journal of the American College of Medical Genetics·Hadley Stevens SmithHeidi V Russell
Sep 13, 2019·Journal of Medical Genetics·Antonis VerverisKyproula Christodoulou
Jun 7, 2019·Journal of Neurology, Neurosurgery, and Psychiatry·Stefano C PrevitaliAlessandra Bolino
Aug 8, 2020·British Journal of Pharmacology·Mireia Herrando-GrabulosaXavier Navarro
Oct 30, 2018·Journal of the American Heart Association·Chowdhury S AbdullahMd Shenuarin Bhuiyan
Nov 9, 2017·European Journal of Neurology : the Official Journal of the European Federation of Neurological Societies·R NandhagopalP Scott
Jul 27, 2021·Frontiers in Physiology·Richa AishwaryaMd Shenuarin Bhuiyan

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Methods Mentioned

BETA
exome sequencing

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