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ORPHA:544602

Congenital myopathy with reduced type 2 muscle fibers

low confidenceDisorder

Also known as: Congenital myopathy with fast-twitch fiber atrophy · Congenital myopathy with reduced type II muscle fibers · Congenital myopathy with type 2 muscle fiber atrophy · Congenital myopathy with type II fiber atrophy

Publications

0

Trials

0

Interventional, condition-specific

Researchers

0

Distinct authors in sample

Gene link

MYL1

Moderate

Readiness

1/6

Stages with a signal

Clinical definition (Orphanet)

A rare characterized by onset of severe muscle weakness with selective atrophy/hypotrophy or absence of type II myofibers. Patients present at birth with and respiratory failure, as well as mild facial and severe axial and proximal upper and lower limb weakness with areflexia and mild contractures. Eye movements and cardiac function are normal.

How rare: <1 / 1 000 000 — fewer than one in a million. In a city the size of Kolkata, that might mean on the order of fifteen people.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (2)

myopathy, congenital, with fast-twitch (type II) fiber atrophy · myopathy, congenital, with fast-twitch (type II) fibre atrophy

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

1/6 stages with a signal

Search queries returned nothing — this usually means a naming mismatch, not proof that nothing exists.

  1. Gene identifiedPresent

    Moderate — MYL1

  2. LiteratureNot checked

    Query returned nothing — not evidence of absence Source

  3. Phenotype characterisedNot checked

    Not yet enriched from Monarch / HPO

  4. Animal modelNot checked

    Not yet enriched from Monarch / Alliance

  5. Orphan designationNot checked

    FDA/EMA orphan-drug designation not enriched yet

  6. Interventional trialNot checked

    Broken query — trial zero not trusted

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Probably — there is moderate evidence for MYL1.

GenCC classification: Moderate.

Phenotypes (Monarch / HPO)

Not enriched in this build — Monarch phenotype joins were not run for this record.

Animal models (Monarch / Alliance)

Not enriched in this build.

Literature

Is anyone studying this?

0

We found no papers under this exact name — work may still exist under another label.

0 in the last 10 years · low confidence

Phrase hits: 0 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

0

Distinct author names in 0 sampled papers.

Who's working on it?

No author names could be extracted from the sampled publications. Try the Europe PMC query in “How we counted this,” or contact an umbrella rare-disease organisation for researcher referrals.

Clinical research

Is a treatment being tested?

0

interventional trials for this specific condition

No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present). 6 trials are registered for congenital myopathy, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 27 July 2026

No matched interventional trials. This is true for 73% of diseases in the trials denominator (5114 of 7003). Here are the researchers publishing on it.

low confidence

Recruiting interventional trials

From the matched ClinicalTrials.gov set

No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.

6 interventional trials matched congenital myopathy, the broader category — listed below. Those studies are not counted in the condition-specific total.

Broader category: congenital myopathy

6

Interventional trials for the parent category, exclusive of NCT IDs already counted above. Eligibility for this subtype is not guaranteed.

Worth raising with a clinician. How we count trials.

Recruiting under the broader category

Where to find support

We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

"Congenital myopathy with reduced type 2 muscle fibers" OR "Congenital myopathy with fast-twitch fiber atrophy" OR "Congenital myopathy with reduced type II muscle fibers" OR "Congenital myopathy with type 2 muscle fiber atrophy" OR "Congenital myopathy with type II fiber atrophy" OR "myopathy, congenital, with fast-twitch (type II) fiber atrophy" OR "myopathy, congenital, with fast-twitch (type II) fibre atrophy"

Run this search on Europe PMC

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Congenital myopathy with reduced type 2 muscle fibers" OR "Congenital myopathy with fast-twitch fiber atrophy" OR "Congenital myopathy with reduced type II muscle fibers" OR "Congenital myopathy with type 2 muscle fiber atrophy" OR "Congenital myopathy with type II fiber atrophy" OR "myopathy, congenital, with fast-twitch (type II) fiber atrophy" OR "myopathy, congenital, with fast-twitch (type II) fibre atrophy" OR "MYL1" OR "hereditary skeletal muscle disorder"

Recall-expansion terms: MYL1, hereditary skeletal muscle disorder

Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"congenital myopathy"

Query health: broken — strategies attempted: phrase, recall-expansion; with hits: none

Parent literature probe: autosomal recessive disease (MONDO:0006025) — 11924 hits

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Zero publications but parent term autosomal recessive disease has 11924 — literature likely indexed under a broader name

Ingested 2026-07-27T18:17:50.190Z · excluded from neglect metrics