Case#: Case III-2, 42 yr, female, early childhood onset
DiseaseAssertion: DCM
FamilyInfo: Family D, her father (II-5) had late-onset foot drop and hand weakness, died at age 51 from a myocardial infarction, her son (IV-3) had a severe generalized weakness since childhood, never walked and had prominent neck extensor contractures, died at age 19 years from a presumed cardiopulmonary event, 2 sisters (III-1 and III-3) had early-onset weakness and foot drop, her nephew (IV-1) had severe weakness and was wheelchair dependent, muscle biopsy, diagnosed with an unspecified muscular dystrophy, her niece (IV-2) had severe congenital weakness and died in her teens, all affected family members had contractures of neck extensors, heel cords, knee flexors, and elbow flexors
CasePresentingHPOs: progressive muscle weakness, lower limb muscle weakness, gait disturbance, slender build, scapular winging, thoracic scoliosis, weakness of facial musculature, generalized limb muscle atrophy, sinus tachycardia (HP:0003323, HP:0007340, HP:0001288, HP:0001533, HP:0003691, HP:0002943, HP:0030319, HP:0009055, HP:0011703)
CaseHPOFreeText: weakness and gait at age 5, nonambulatory by late-teens, wheelchair dependent, neck muscle atrophy, hypoactive myotatic reflexes
CaseNotHPOs: respiratory distress, syncope, chest pain, palpitations (HP:0002098, HP:0001279, HP:0100749, HP:0001962)
CaseNotHPOFreeText: normal sensory
CasePreviousTesting: Analysis included most of the other congenital myopathy genes and was otherwise negative
CaseGenotypingMethod: neurological examination, serum creatine kinase, nerve conduction studies, concentric needle electromyography, electrocardiogram, echocardiogram, forced vital capacity, muscle biopsy, immunohistochemical analyses, strength testing (MRC 3/2), arm flexors (MRC 4/4), arm extensors (MRC 3/3), wrist flexors (MRC 3/3), wrist extensors (MRC 1/3), finger flexors (MRC 2/2), finger extensors (MRC 2/2), finger adductors and abductors (MRC 4/4), hip flexors (MRC 2/2), hip abductors and adductors (MRC 3/3), knee flexors (MRC 2/2), knee extensors (MRC 2/2), foot dorsiflexors (MRC 0/0), plantar flexors (MRC 3/3) toe flexors (MRC 2/2), and toe extensors (MRC 1/1), normal 0.82 L (25%) FVC, 25% left ventricular ejection fraction, normal NCSs, increased small polyphasic MUAP, occasional fibrillation potentials, positive sharp waves, and brief myotonic discharges, facioscapulohumeral muscular dystrophy type 1, Emery–Dreifuss muscular dystrophy (EMD, LMNA, and FHL1 gene disorders), and limb-girdle muscular dystrophy type 1C were negative
Variant: NM_000257.2
ClinVar: absent
CAID: absent
gnomAD: absent