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Absence of an orphan mitochondrial protein, c19orf12, causes a distinct clinical subtype of neurodegeneration with brain iron accumulation.

Abstract：

:The disease classification neurodegeneration with brain iron accumulation (NBIA) comprises a clinically and genetically heterogeneous group of progressive neurodegenerative disorders characterized by brain iron deposits in the basal ganglia. For about half of the cases, the molecular basis is currently unknown. We used homozygosity mapping followed by candidate gene sequencing to identify a homozygous 11 bp deletion in the orphan gene C19orf12. Mutation screening of 23 ideopathic NBIA index cases revealed two mutated alleles in 18 of them, and one loss-of-function mutation is the most prevalent. We also identified compound heterozygous missense mutations in a case initially diagnosed with Parkinson disease at age 49. Psychiatric signs, optic atrophy, and motor axonal neuropathy were common findings. Compared to the most prevalent NBIA subtype, pantothenate kinase associated neurodegeneration (PKAN), individuals with two C19orf12 mutations were older at age of onset and the disease progressed more slowly. A polyclonal antibody against the predicted membrane spanning protein showed a mitochondrial localization. A histopathological examination in a single autopsy case detected Lewy bodies, tangles, spheroids, and tau pathology. The mitochondrial localization together with the immunohistopathological findings suggests a pathomechanistic overlap with common forms of neurodegenerative disorders.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Hartig MB,Iuso A,Haack T,Kmiec T,Jurkiewicz E,Heim K,Roeber S,Tarabin V,Dusi S,Krajewska-Walasek M,Jozwiak S,Hempel M,Winkelmann J,Elstner M,Oexle K,Klopstock T,Mueller-Felber W,Gasser T,Trenkwalder C,Tiranti V,Kr

doi

10.1016/j.ajhg.2011.09.007

subject

Has Abstract

pub_date

2011-10-07 00:00:00

pages

543-50

issue

4

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(11)00397-1

journal_volume

89

pub_type

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