Introduction: Spinal muscular atrophy (SMA) is an autosomal recessive disorder caused by a homozygous deletion of the survival motor neuron (SMN) 1 gene. Nusinersen is an antisense oligonucleotide enhancing the production of the SMN protein. It has received approval by the European Medicines Agency (EMA) in 2017, based on the clinical trials demonstrating the effectiveness of nusinersen in several types of SMA. In Hungary, the first patient received nusinersen treatment in April 2018. Our aim is to summarize our experience regarding the efficacy, safety and tolerability of nusinersen in our patients. Methods: Data were collected retrospectively in all types of SMA patients (type 1e3) starting treatment with nusinersen in Hungary between April 2018 and December 2019. Motor functions were evaluated at baseline, at the fourth and all following injections. Results: By 31 st December 2019, nusinersen therapy was initiated in 54 patients at either of the two Hungarian treatment centres. Mean age of the patients at the start of the treatment was 6.3 years (±5,4 range 0.4e17.9). 13 patients are type 1 (mean 0.78 ± 0.27, range 0.4e1.5 yrs), 21 patients are type 2 (mean 4.5 ± 3.3, range 1.3e12 yrs), 23 patients are type 3 (mean 10.9 ± 5.2, range 2.9e17.9 yrs). Fourteen patients had severe scoliosis, four of them underwent spine stabilizing surgery. During the study period 340 injections were administered without any new safety concerns emerging. The data of 38 patients, who had completed the first six treatments, were included in the final statistical analysis. Motor function has improved in most of the children. By the 307th day visit, on average, a 14.9 (±5,1) point improvement was measured on the CHOP INTEND scale in type 1 patients (p ¼ 0.016). All patients with type 1 SMA who performed the motor evaluation (7/10) have improved by more than four (7-21) points. Regarding type 2 patients, a 7.2 (range-2-17) point increase from baseline (p < 0.001) on the Hammersmith Functional Motor Scale Expanded (HFMSE) and 4.3 (range: 2e9) point increase (p ¼ 0.031) on the Revised Upper Limb Module (RULM) were found. The distance of the 6 min walk test also increased by 33.9 m on average (range-16 e 106), in type 3 patients. Conclusion: According to our results nusinersen has the same safety and tolerability profile as in the clinical trials. In a heterogenic patient population of SMA type 1 and 2, nusinersen showed similar efficacy as seen in the pivotal studies. A clinically and statistically significant improvement of motor functions was also detectable in type 3 patients with heterogeneous age distribution.
Mitogen‐activated protein kinase 8‐interacting protein 3 gene (MAPK8IP3) encodes the c‐Jun‐amino‐terminal kinase‐interacting protein 3 (JIP3) and is involved in retrograde axonal transport. Heterozygous de novo pathogenic variants in MAPK8IP3 result in a neurodevelopmental disorder with or without brain abnormalities and possible axonal peripheral neuropathy. Whole‐exome sequencing was performed on an individual presenting with severe congenital muscle hypotonia of neuronal origin mimicking lethal spinal muscular atrophy. Compound heterozygous rare variants (a splice and a missense) were detected in MAPK8IP3, inherited from the healthy parents. Western blot analysis in a muscle biopsy sample showed a more than 60% decrease in JIP3 expression. Here, we suggest a novel autosomal recessive phenotype of a lower motor neuron disease caused by JIP3 deficiency.
Absztrakt: A veleszületett gerincvelői izomsorvadás ritka, progresszív neurodegeneratív betegség, a gyermekkori halál egyik legjelentősebb genetikai oka. Az orvostudomány lehetőségei a XXI. század előtt a progresszió megfékezésére, a szövődmények késleltetésére és ellátására korlátozódtak. A legsúlyosabb génhibában szenvedő gyermekeket általában kétéves kor előtt elveszítettük. A genetikai diagnosztika fejlődése lehetővé teszi a korai diagnózist, a súlyosság és a progresszió előrejelzését. A 2018-ban hazánkban engedélyezett intrathecalis nuszinerszennel a nagy betegszámon alapuló klinikai eredmények meggyőzőek. A 2019-től elérhető új, intravénás génpótló terápiával (onaszemnogén abeparvovek) kapcsolatos tapasztalatok még kisebb betegszámon alapulnak. Hazánkban öt betegnél került sor az alkalmazására a Bethesda Gyermekkórházban, szigorú szakmai kritériumok és előkészületek alapján. Közülük annak a három gyermeknek a kezeléséről számolunk be dolgozatunkban, akiknél már rendelkezünk utánkövetési tapasztalatokkal. Vizsgálatunk szerint a készítmény elősegíti a mozgásteljesítmény javulását. A mellékhatások elsősorban reverzibilis májenzim-emelkedésben, thrombocytopeniában, granulocytopeniában és a szívizom-nekroenzim emelkedésében nyilvánultak meg. Ezért fontosnak tartjuk a betegek szoros és tartós követését, a mellékhatások korai észlelése és elhárítása érdekében. Orv Hetil. 2020; 161(42): 1806–1816.
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