Novel Phenotypes and Cardiac Involvement Associated With DNA2 Genetic Variants.

Abstract:

:Objectives: To report two novel DNA2 gene mutations causing early onset myopathy with cardiac involvement and late onset mitochondriopathy with rhabdomyolysis. Methods: We performed detailed clinical, muscle histopathology and molecular studies including mitochondrial gene NGS analysis in two patients (Patient 1 and 2), a mother and her son, belonging to a Mexican family, and a third sporadic French patient. Results: Patient 1 and 2 presented with an early onset myopathy associated with ptosis, velopharyngeal weakness, and cardiac involvement. Patient 3 presented rhabdomyolysis unmasking a mitochondrial disease characterized by a sensorineural hearing loss, ptosis, and lipomas. Muscle biopsies performed in all patients showed variable mitochondrial alterations. Patient 3 had multiple mtDNA deletion in his muscle. Genetic studies revealed a novel heterozygous frameshift mutation in DNA2 gene (c.2346delT p.Phe782Leufs*3) in P1 and P2, and a novel heterozygous missense mutation in DNA2 gene (c.578T>C p.Leu193Ser) in the P3. Conclusions: To date only few AD cases presenting either missense or truncating DNA2 variants have been reported. None of them presented with a cardiac involvement or rhabdomyolysis. Here we enlarge the genetic and phenotypic spectrum of DNA2-related mitochondrial disorders.

journal_name

Front Neurol

journal_title

Frontiers in neurology

authors

González-Del Angel A,Bisciglia M,Vargas-Cañas S,Fernandez-Valverde F,Kazakova E,Escobar RE,Romero NB,Jardel C,Rucheton B,Stojkovic T,Malfatti E

doi

10.3389/fneur.2019.01049

subject

Has Abstract

pub_date

2019-10-04 00:00:00

pages

1049

issn

1664-2295

journal_volume

10

pub_type

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