Abstract:
:We report two siblings with infantile onset seizures, severe developmental delay and spastic paraplegia, in whom whole-genome sequencing revealed compound heterozygous mutations in the AP4S1 gene, encoding the σ subunit of the adaptor protein complex 4 (AP-4). The effect of the predicted loss-of-function variants (p.Gln46Profs*9 and p.Arg97*) was further investigated in a patient's fibroblast cell line. We show that the premature stop mutations in AP4S1 result in a reduction of all AP-4 subunits and loss of AP-4 complex assembly. Recruitment of the AP-4 accessory protein tepsin, to the membrane was also abolished. In retrospect, the clinical phenotype in the family is consistent with previous reports of the AP-4 deficiency syndrome. Our study reports the second family with mutations in AP4S1 and describes the first two patients with loss of AP4S1 and seizures. We further discuss seizure phenotypes in reported patients, highlighting that seizures are part of the clinical manifestation of the AP-4 deficiency syndrome. We also hypothesize that endosomal trafficking is a common theme between heritable spastic paraplegia and some inherited epilepsies.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Hardies K,May P,Djémié T,Tarta-Arsene O,Deconinck T,Craiu D,AR working group of the EuroEPINOMICS RES Consortium.,Helbig I,Suls A,Balling R,Weckhuysen S,De Jonghe P,Hirst Jdoi
10.1093/hmg/ddu740subject
Has Abstractpub_date
2015-04-15 00:00:00pages
2218-27issue
8eissn
0964-6906issn
1460-2083pii
ddu740journal_volume
24pub_type
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