Journal Article

DZNE-2020-07221

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png FAHN/SPG35: a narrow phenotypic spectrum across disease classifications.

Rattay, T. W. (First author)DZNE* ; Lindig, T. ; Baets, J. ; Smets, K. ; Deconinck, T. ; Söhn, A. S. ; Hörtnagel, K. ; Eckstein, K. N.DZNE* ; Wiethoff, S.DZNE* ; Reichbauer, J. ; Döbler-Neumann, M. ; Krägeloh-Mann, I. ; Auer-Grumbach, M. ; Plecko, B. ; Münchau, A. ; Wilken, B. ; Janauschek, M. ; Giese, A.-K. ; De Bleecker, J. L. ; Ortibus, E. ; Debyser, M. ; Lopez de Munain, A. ; Pujol, A. ; Bassi, M. T. ; D'Angelo, M. G. ; De Jonghe, P. ; Züchner, S. ; Bauer, P. ; Schöls, L.DZNE* ; Schüle, R. (Last author)DZNE*

2019
Oxford Univ. Press Oxford

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Please use a persistent id in citations: doi:10.1093/brain/awz102

Abstract: The endoplasmic reticulum enzyme fatty acid 2-hydroxylase (FA2H) plays a major role in the formation of 2-hydroxy glycosphingolipids, main components of myelin. FA2H deficiency in mice leads to severe central demyelination and axon loss. In humans it has been associated with phenotypes from the neurodegeneration with brain iron accumulation (fatty acid hydroxylase-associated neurodegeneration, FAHN), hereditary spastic paraplegia (HSP type SPG35) and leukodystrophy (leukodystrophy with spasticity and dystonia) spectrum. We performed an in-depth clinical and retrospective neurophysiological and imaging study in a cohort of 19 cases with biallelic FA2H mutations. FAHN/SPG35 manifests with early childhood onset predominantly lower limb spastic tetraparesis and truncal instability, dysarthria, dysphagia, cerebellar ataxia, and cognitive deficits, often accompanied by exotropia and movement disorders. The disease is rapidly progressive with loss of ambulation after a median of 7 years after disease onset and demonstrates little interindividual variability. The hair of FAHN/SPG35 patients shows a bristle-like appearance; scanning electron microscopy of patient hair shafts reveals deformities (longitudinal grooves) as well as plaque-like adhesions to the hair, likely caused by an abnormal sebum composition also described in a mouse model of FA2H deficiency. Characteristic imaging features of FAHN/SPG35 can be summarized by the 'WHAT' acronym: white matter changes, hypointensity of the globus pallidus, ponto-cerebellar atrophy, and thin corpus callosum. At least three of four imaging features are present in 85% of FA2H mutation carriers. Here, we report the first systematic, large cohort study in FAHN/SPG35 and determine the phenotypic spectrum, define the disease course and identify clinical and imaging biomarkers.

Keyword(s): Child (MeSH) ; Cohort Studies (MeSH) ; Demyelinating Diseases: genetics (MeSH) ; Female (MeSH) ; Heredodegenerative Disorders, Nervous System: genetics (MeSH) ; Humans (MeSH) ; Male (MeSH) ; Mixed Function Oxygenases: genetics (MeSH) ; Mutation: genetics (MeSH) ; Pedigree (MeSH) ; Phenotype (MeSH) ; Retrospective Studies (MeSH) ; Spastic Paraplegia, Hereditary: classification (MeSH) ; Spastic Paraplegia, Hereditary: genetics (MeSH)

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Contributing Institute(s):

1. Parkinson Genetics (AG Gasser 1)
2. Tübingen Pre 2020 (Tübingen Pre 2020)
3. Functional Neurogeriatrics (AG Maetzler)

Research Program(s):

1. 345 - Population Studies and Genetics (POF3-345) (POF3-345)
2. 344 - Clinical and Health Care Research (POF3-344) (POF3-344)

Appears in the scientific report 2019

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Database coverage:
; BIOSIS Previews ; Clarivate Analytics Master Journal List ; Current Contents - Clinical Medicine ; Current Contents - Life Sciences ; Ebsco Academic Search ; IF >= 15 ; JCR ; Nationallizenz ; SCOPUS ; Web of Science Core Collection

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