دورية أكاديمية

Genetic Mosaicism in Calmodulinopathy

التفاصيل البيبلوغرافية
العنوان: Genetic Mosaicism in Calmodulinopathy
المؤلفون: Wren, LM, Jiménez-Jáimez, J, Al-Ghamdi, S, Al-Aama, JY, Bdeir, A, Al-Hassnan, ZN, Kuan, JL, Foo, RY, Potet, F, Johnson, CN, Aziz, MC, Carvill, GL, Kaski, J-P, Crotti, L, Perin, F, Monserrat, L, Burridge, PW, Schwartz, PJ, Chazin, WJ, Bhuiyan, ZA, George, AL
المصدر: Circulation: Genomic and Precision Medicine , 12 (9) pp. 375-385. (2019)
سنة النشر: 2019
المجموعة: University College London: UCL Discovery
مصطلحات موضوعية: arrhythmia, calmodulin, mosaicism, L-type Ca2+channel
الوصف: Background: CaM (calmodulin) mutations are associated with congenital arrhythmia susceptibility (calmodulinopathy) and are most often de novo. In this report, we sought to broaden the genotype-phenotype spectrum of calmodulinopathies with 2 novel calmodulin mutations and to investigate mosaicism in 2 affected families. Methods: CaM mutations were identified in 4 independent cases by DNA sequencing. Biochemical and electrophysiological studies were performed to determine functional consequences of each mutation. Results: Genetic studies identified 2 novel CaM variants (CALM3-E141K in 2 cases; CALM1-E141V) and one previously reported CaM pathogenic variant (CALM3-D130G) among 4 probands with shared clinical features of prolonged QTc interval (range 505–725 ms) and documented ventricular arrhythmia. A fatal outcome occurred for 2 of the cases. The parents of all probands were asymptomatic with normal QTc duration. However, 2 of the families had multiple affected offspring or multiple occurrences of intrauterine fetal demise. The mother from the family with recurrent intrauterine fetal demise exhibited the CALM3-E141K mutant allele in 25% of next-generation sequencing reads indicating somatic mosaicism, whereas CALM3-D130G was present in 6% of captured molecules of the paternal DNA sample, also indicating mosaicism. Two novel mutations (E141K and E141V) impaired Ca2+ binding affinity to the C-domain of CaM. Human-induced pluripotent stem cell-derived cardiomyocytes overexpressing mutant or wild-type CaM showed that both mutants impaired Ca2+-dependent inactivation of L-type Ca2+ channels and prolonged action potential duration. Conclusions: We report 2 families with somatic mosaicism associated with arrhythmogenic calmodulinopathy, and demonstrate dysregulation of L-type Ca2+ channels by 2 novel CaM mutations affecting the same residue. Parental mosaicism should be suspected in families with unexplained fetal arrhythmia or fetal demise combined with a documented CaM mutation.
نوع الوثيقة: article in journal/newspaper
وصف الملف: text
اللغة: English
العلاقة: https://discovery.ucl.ac.uk/id/eprint/10081668/1/CIRCCVG2019002581%20Revised%20June%202019%20TRACKED-1.pdfTest; https://discovery.ucl.ac.uk/id/eprint/10081668/7/CIRCCVG2019002581%20Supplemental%20Information%20Revised%20June%202019-1.pdfTest; https://discovery.ucl.ac.uk/id/eprint/10081668Test/
الإتاحة: https://discovery.ucl.ac.uk/id/eprint/10081668/1/CIRCCVG2019002581%20Revised%20June%202019%20TRACKED-1.pdfTest
https://discovery.ucl.ac.uk/id/eprint/10081668/7/CIRCCVG2019002581%20Supplemental%20Information%20Revised%20June%202019-1.pdfTest
https://discovery.ucl.ac.uk/id/eprint/10081668Test/
حقوق: open
رقم الانضمام: edsbas.8A1DC809
قاعدة البيانات: BASE