Muscle involvement in a large cohort of pediatric patients with genetic diagnosis of mitochondrial disease

Jou, C. ; Ortigoza-Escobar, J.D. ; O'Callaghan, M.M. ; Nascimento, A. ; Darling, A. ; Pias-Peleteiro, L. ; Perez-Duenas, B. ; Pineda, M. ; Codina, A. ; Arjona, C. ; Armstrong, J. ; Palau, F. ; Ribes, A. ; Gort, L. ; Tort, F. ; Navas, P. ; Ruiz-Pesini, E. (Universidad de Zaragoza) ; Emperador, S. (Universidad de Zaragoza) ; Lopez-Gallardo, E. (Universidad de Zaragoza) ; Bayona-Bafaluy, P. (Universidad de Zaragoza) ; Montero, R. ; Jimenez-Mallebrera, C. ; Garcia-Cazorla, A. ; Montoya, J. (Universidad de Zaragoza) ; Yubero, D. ; Artuch, R.

Resumen: P06.32C
Mitochondrial diseases (MD) are a group of genetic and acquired disorders which present significant diagnostic challenges. Here we report the disease characteristics of a large cohort of pediatric MD patients (n = 95) with a definitive genetic diagnosis, giving special emphasis on clinical muscle involvement, biochemical and histopathological features. Of the whole cohort, 51 patients harbored mutations in nuclear DNA (nDNA) genes and 44 patients had mutations in mitochondrial DNA (mtDNA) genes. The nDNA patients were more likely to have a reduction in muscle fiber succinate dehydrogenase (SDH) stains and in SDH-positive blood vessels, while a higher frequency of mtDNA patients had ragged red (RRF) and blue fibers. The presence of positive histopathological features was associated with ophthalmoplegia, myopathic facies, weakness and exercise intolerance. In 17 patients younger than two years of age, RRF and blue fibers were observed only in one case, six cases presented cytochrome c oxidase (COX) reduction/COX-fibers, SDH reduction was observed in five and all except one presented SDH-positive blood vessels. In conclusion, muscle involvement was a frequent finding in our series of MD patients, especially in those harboring mutations in mtDNA genes.

Idioma: Inglés

Año: 2019

Publicado en: Journal of Clinical Medicine 8, 68 (2019), e8010068 [12 pp.]
ISSN: 2077-0383

Originalmente disponible en: Texto completo de la revista

Factor impacto JCR: 3.303 (2019)

Categ. JCR: MEDICINE, GENERAL & INTERNAL rank: 36 / 165 = 0.218 (2019) - Q1 - T1

Financiación: info:eu-repo/grantAgreement/ES/ISCIII/PI16-01048
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/PI17-00021
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/PI17-0019
Financiación: info:eu-repo/grantAgreement/ES/ISCIII-FIS/PI15-01082

Tipo y forma: Article (Published version)

Área (Departamento): Area Histología (Dpto. Anatom.Histolog.Humanas)
Área (Departamento): Área Bioquímica y Biolog.Mole. (Dpto. Bioq.Biolog.Mol. Celular)