congenital myopathy with reduced type 2 muscle fibers
MONDO:0034109Mondo
Findings
No curated finding names congenital myopathy with reduced type 2 muscle fibers yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
- Inheritance
- Autosomal recessive inheritance
- Onset and course
- Death in infancy · Congenital onset
HPO, annotations 2026-09-02
Features
25 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Axial muscle weaknessHPOHP:0003327
- 2 of 2 reported patients
- HypotoniaHPOHP:0001252
- 2 of 2 reported patients
- Increased endomysial connective tissueHPOHP:0100297
- 2 of 2 reported patients
- Increased variability in muscle fiber diameterHPOHP:0003557
- 2 of 2 reported patients
- Respiratory failureHPOHP:0002878
- 2 of 2 reported patients
- Respiratory insufficiency due to muscle weaknessHPOHP:0002747
- 2 of 2 reported patients
- Weakness of facial musculatureHPOHP:0030319
- 2 of 2 reported patients
- ApneaHPOHP:0002104
- 1 of 2 reported patients
- AreflexiaHPOHP:0001284
- 1 of 2 reported patients
- Decreased fetal movementHPOHP:0001558
- 1 of 2 reported patients
- Elbow flexion contractureHPOHP:0002987
- 1 of 2 reported patients
- EMG: decremental response of compound muscle action potential to repetitive nerve stimulationHPOHP:0003403
- 1 of 2 reported patients
Show the remaining 13
- Feeding difficultiesHPOHP:0011968
- 1 of 2 reported patients
- Generalized muscle weaknessHPOHP:0003324
- 1 of 2 reported patients
- High palateHPOHP:0000218
- 1 of 2 reported patients
- Hip contractureHPOHP:0003273
- 1 of 2 reported patients
- Knee flexion contractureHPOHP:0006380
- 1 of 2 reported patients
- Myopathic faciesHPOHP:0002058
- 1 of 2 reported patients
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- MYL1HGNC:7582
- Moderate · G2P · Autosomal recessive · 2026
- Moderate · PanelApp Australia · Autosomal recessive · 2025
- Supportive · Orphanet · Autosomal recessive · 2021
- Limited · Ambry Genetics · Autosomal recessive · 2018
- Limited · Labcorp Genetics (formerly Invitae) · Unknown · 2019
Where it sits
Other names
2 names
Resolves to: congenital myopathy with reduced type 2 muscle fibers
- Also called
- myopathy, congenital, with fast-twitch (type II) fiber atrophymyopathy, congenital, with fast-twitch (type II) fibre atrophy