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A PRPH splice-donor variant associates with reduced sural nerve amplitude and risk of peripheral neuropathy.


ABSTRACT: Nerve conduction (NC) studies generate measures of peripheral nerve function that can reveal underlying pathology due to axonal loss, demyelination or both. We perform a genome-wide association study of sural NC amplitude and velocity in 7045 Icelanders and find a low-frequency splice-donor variant in PRPH (c.996+1G>A; MAF?=?1.32%) associating with decreased NC amplitude but not velocity. PRPH encodes peripherin, an intermediate filament (IF) protein involved in cytoskeletal development and maintenance of neurons. Through RNA and protein studies, we show that the variant leads to loss-of-function (LoF), as when over-expressed in a cell line devoid of other IFs, it does not allow formation of the normal filamentous structure of peripherin, yielding instead punctate protein inclusions. Recall of carriers for neurological assessment confirms that from an early age, homozygotes have significantly lower sural NC amplitude than non-carriers and are at risk of a mild, early-onset, sensory-negative, axonal polyneuropathy.

SUBMITTER: Bjornsdottir G 

PROVIDER: S-EPMC6468012 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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A PRPH splice-donor variant associates with reduced sural nerve amplitude and risk of peripheral neuropathy.

Bjornsdottir Gyda G   Ivarsdottir Erna V EV   Bjarnadottir Kristbjorg K   Benonisdottir Stefania S   Gylfadottir Sandra Sif SS   Arnadottir Gudny A GA   Benediktsson Rafn R   Halldorsson Gisli Hreinn GH   Helgadottir Anna A   Jonasdottir Adalbjorg A   Jonasdottir Aslaug A   Jonsdottir Ingileif I   Kristinsdottir Anna Margret AM   Magnusson Olafur Th OT   Masson Gisli G   Melsted Pall P   Rafnar Thorunn T   Sigurdsson Asgeir A   Sigurdsson Gunnar G   Skuladottir Astros A   Steinthorsdottir Valgerdur V   Styrkarsdottir Unnur U   Thorgeirsson Gudmundur G   Thorleifsson Gudmar G   Vikingsson Arnor A   Gudbjartsson Daniel F DF   Holm Hilma H   Stefansson Hreinn H   Thorsteinsdottir Unnur U   Norddahl Gudmundur L GL   Sulem Patrick P   Thorgeirsson Thorgeir E TE   Stefansson Kari K  

Nature communications 20190416 1


Nerve conduction (NC) studies generate measures of peripheral nerve function that can reveal underlying pathology due to axonal loss, demyelination or both. We perform a genome-wide association study of sural NC amplitude and velocity in 7045 Icelanders and find a low-frequency splice-donor variant in PRPH (c.996+1G>A; MAF = 1.32%) associating with decreased NC amplitude but not velocity. PRPH encodes peripherin, an intermediate filament (IF) protein involved in cytoskeletal development and main  ...[more]

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