Abstract:
:Mutations in the SCN8A gene encoding the neuronal voltage-gated sodium channel Nav1.6 are known to be associated with epileptic encephalopathy type 13. We identified a novel de novo SCN8A mutation (p.Phe360Ala, c.1078_1079delTTinsGC, Exon 9) in a 6-year-old girl with epileptic encephalopathy accompanied by severe juvenile osteoporosis and multiple skeletal fractures, similar to three previous case reports. Skeletal assessment using dual energy X-ray absorptiometry (DXA), high-resolution peripheral quantitative computed tomography (HR-pQCT) and serum analyses revealed a combined trabecular and cortical bone loss syndrome with elevated bone resorption. Likewise, when we analyzed the skeletal phenotype of 2week-old Scn8a-deficient mice we observed reduced trabecular and cortical bone mass, as well as increased osteoclast indices by histomorphometric quantification. Based on this cumulative evidence the patient was treated with neridronate (2mg/kg body weight administered every 3months), which fully prevented additional skeletal fractures for the next 25months. Taken together, our data provide evidence for a negative impact of SCN8A mutations on bone mass, which can be positively influenced by anti-resorptive treatment.
journal_name
Bonejournal_title
Boneauthors
Rolvien T,Butscheidt S,Jeschke A,Neu A,Denecke J,Kubisch C,Meisler MH,Pueschel K,Barvencik F,Yorgan T,Oheim R,Schinke T,Amling Mdoi
10.1016/j.bone.2017.06.025subject
Has Abstractpub_date
2017-10-01 00:00:00pages
136-143eissn
8756-3282issn
1873-2763pii
S8756-3282(17)30224-7journal_volume
103pub_type
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