Family 6 - Patients 6a and 6b

FamilyPresentingHPOs: HP:0007340, HP:0003701, HP:0000467, HP:0003327, HP:0200136, HP:0003691, HP:0003306, HP:0002650, HP:0040081, HP:0002111, HP:0100284

HPOsFreeText: myopathic muscle unit action potentials, 6a muscle pathology with vacuolar myopathy with glycogen excess

FamilyNotHPOs: HP:0010628

Ethnicity: Iranian

ProbandLabel: 6a, male, 12yo at onset, 25yo at diagnosis

FamilyAddInfo: 6b (male) dx at 33yo, 6a MRC sum score = 78, 6b MRC sum score = 79, both patients required use of NIV

FamilyPreviousTesting: Respiratory Evaluation: 6a FVC = 19%, 6b FVC = 38%, 6a CK = 820 U/L, 6b CK = 503 U/L, muscle pathology (examined only in 6a), DBS enzyme activity (with inhibition) for 6a = 0 μmol/L/h, for 6b = 0.21 μmol/L/h, NCS, EMG

FamilyGenotypingMethod: GAA analyzed with Sanger Sequencing for entire coding region and conserved exon-intron splice junctions, PCR performed for deletion screening

Variant: NM_000152.4(GAA):c.1979G>A (p.Arg660His)

ClinVar: 189172, https://www.ncbi.nlm.nih.gov/clinvar/variation/189172/

gnomAD: 3.279e-05, http://exac.broadinstitute.org/variant/17-78086765-G-A