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ORPHA:26791

Multiple acyl-CoA dehydrogenase deficiency

medium confidenceDisorder

Also known as: Glutaric acidemia type 2 · Glutaric aciduria type 2 · MAD deficiency · MADD

Query health: suspect — Only one of 2 strategies returned hits (phrase).

Publications

1,420

92.3th percentile

Trials

1

Interventional, condition-specific

Researchers

1,149

Distinct authors in sample

Gene link

ETFA, ETFB, ETFDH

Definitive

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

Multiple acyl-CoA dehydrogenation deficiency (MADD) is a disorder of fatty acid and amino acid oxidation and is a clinically heterogeneous disorder ranging from a severe presentation with , and liver disease, to a mild childhood/adult disease with episodic decompensation, muscle weakness, and respiratory failure.

How rare: 1-9 / 1 000 000 — roughly one to nine people per million. In a city the size of Kolkata, perhaps a few dozen.

Orphanet entry

Cross-references

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

Additional Mondo synonyms (8)

Glutaric Aciduria Type II · electron transfer flavoprotein deficiency · glutaric acidemia type 2 · glutaric acidemia type II · glutaric aciduria type 2 · glutaric aciduria, type 2 · multiple acyl Coenzyme A dehydrogenase deficiency · multiple acyl-CoA dehydrogenase deficiency

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.”

3/6 stages with a signal

An interventional trial matched this condition name on ClinicalTrials.gov — see trials below.

  1. Gene identifiedPresent

    Definitive — ETFA, ETFB, ETFDH

  2. LiteraturePresent

    1,420 matched papers (755 in last 10 years) 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 trialPresent

    1 matched on ClinicalTrials.gov

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?

Yes — we know a specific gene responsible (ETFA, ETFB, ETFDH).

GenCC classification: Definitive.

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?

1,420

1,420 papers have been published on this condition. That is a real research literature — still far smaller than common diseases (breast cancer: over 700,000 papers). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=5449) is 41.

1,420 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).

755 in the last 10 years · medium confidence · 92.3th percentile (publications denominator)

Phrase hits: 1,420 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,149

Distinct author names in 200 sampled papers — named people below.

Who's working on it?

People publishing on this condition (sampled Europe PMC records). Affiliation is the most recent found in that sample.

  1. 01
    Zhang W8 papers · 2026

    Neurology Department, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China. neurozw@163.com.

    Papers in Europe PMC
  2. 02
    Wang J7 papers · 2026

    Department of Neurology, Second People's Hospital of Hefei City.

    Papers in Europe PMC
  3. 03
    Zhang Y7 papers · 2025

    Department of Neurology, Guangdong Provincial People's Hospital, Guangdong Neuroscience Institute, Guangdong Academy of Medical Sciences, Guangzhou, China.

    Papers in Europe PMC
  4. 04
    Kobayashi H6 papers · 2026

    Department of Pediatrics, Shimane University Faculty of Medicine, Izumo, Shimane, Japan.

    Papers in Europe PMC
  5. 05
    Zhang H6 papers · 2026

    Department of Neurology, First Hospital, Shanxi Medical University, No.85, Jiefang South Street, Taiyuan, China.

    Papers in Europe PMC
  6. 06
    Chang X5 papers · 2026

    Department of Neurology, First Hospital, Shanxi Medical University, No.85, Jiefang South Street, Taiyuan, China.

    Papers in Europe PMC
  7. 07
    Guo J5 papers · 2026

    Department of Neurology, First Hospital, Shanxi Medical University, No.85, Jiefang South Street, Taiyuan, China. neuroguo@163.com.

    Papers in Europe PMC
  8. 08
    Hasegawa Y5 papers · 2022

    Department of Pediatrics, Shimane University Faculty of Medicine, Izumo, Shimane, Japan.

    Papers in Europe PMC
  9. 09
    Ma J5 papers · 2026

    Department of Neurology, First Hospital, Shanxi Medical University, No.85, Jiefang South Street, Taiyuan, China.

    Papers in Europe PMC
  10. 10
    Yamaguchi S5 papers · 2022

    Department of Pediatrics, Shimane University Faculty of Medicine, Izumo, Shimane, Japan.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

1

interventional trials for this specific condition

1 interventional trial matched this specific condition name; none in our sample are currently recruiting. 10 trials are registered for acyl-CoA dehydrogenase deficiency, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 27 July 2026

1 interventional trial — more than 73% of diseases in the trials denominator have none at all (5114 of 7003; this disease is at the 76.8th percentile).

medium confidence · 76.8th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

1 interventional trials matched after quoted-phrase search and title/condition post-filter.

No currently recruiting studies in the matched set. Open the same search on ClinicalTrials.gov.

Broader category: acyl-CoA dehydrogenase deficiency

10

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

Observational and natural-history studies

1 observational study matches this condition. These do not test a treatment and are not counted in the interventional-trial headline, but they are genuine research: natural-history work often defines the endpoints needed for a future rare-disease trial, and families may be able to enroll.

None of the matched observational studies is currently listed as recruiting.

Open the complete matched search on ClinicalTrials.gov

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

Directly listed under NPRD Group 2.

Group 2 — long-term / lifelong lower-cost interventions

NPRD envisages State Government support for dietary formulae, hormones, and other lower-cost interventions. This is a different route from the central CoE ₹50 lakh pathway; ask your state health department and a CoE which channel applies.

Central CoE funding may also apply depending on current rules — confirm with a notified Centre of Excellence. Do not assume the ₹50 lakh ceiling covers Group 2 by default. Verify

Centres of Excellence (15)
  • All India Institute of Medical Sciences (AIIMS) — New Delhi, Delhi
  • Maulana Azad Medical College — New Delhi, Delhi
  • Sanjay Gandhi Post Graduate Institute of Medical Sciences — Lucknow, Uttar Pradesh
  • Post Graduate Institute of Medical Education and Research (PGIMER) — Chandigarh, Chandigarh
  • Centre for DNA Fingerprinting & Diagnostics with Nizam’s Institute of Medical Sciences — Hyderabad, Telangana
  • King Edward Memorial Hospital — Mumbai, Maharashtra
  • Institute of Post-Graduate Medical Education and Research (IPGMER) — Kolkata, West Bengal
  • Centre for Human Genetics with Indira Gandhi Hospital — Bengaluru, Karnataka
  • Institute of Child Health and Hospital for Children (ICH & HC) — Chennai, Tamil Nadu
  • All India Institute of Medical Sciences (AIIMS) — Jodhpur, Rajasthan
  • Sree Avittam Thirunal Hospital (SAT), Government Medical College — Thiruvananthapuram, Kerala
  • All India Institute of Medical Sciences (AIIMS) — Bhopal, Madhya Pradesh
  • Regional Institute of Medical Sciences (RIMS) — Imphal, Manipur
  • All India Institute of Medical Sciences (AIIMS) — Patna, Bihar
  • Assam Medical College & Hospital — Dibrugarh, Assam

Voluntary contributions / crowdfunding (separate from CoE funding): https://rarediseases.mohfw.gov.in/

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.

"Multiple acyl-CoA dehydrogenase deficiency" OR "Glutaric acidemia type 2" OR "Glutaric aciduria type 2" OR "MAD deficiency" OR "Glutaric Aciduria Type II" OR "electron transfer flavoprotein deficiency" OR "glutaric acidemia type II" OR "glutaric aciduria, type 2" OR "multiple acyl Coenzyme A dehydrogenase deficiency"

Run this search on Europe PMC

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

"Multiple acyl-CoA dehydrogenase deficiency" OR "Glutaric acidemia type 2" OR "Glutaric aciduria type 2" OR "MAD deficiency" OR "Glutaric Aciduria Type II" OR "electron transfer flavoprotein deficiency" OR "glutaric acidemia type II" OR "glutaric aciduria, type 2" OR "multiple acyl Coenzyme A dehydrogenase deficiency" OR "ETFA" OR "ETFB" OR "ETFDH"

Recall-expansion terms: ETFA, ETFB, ETFDH

Interventional trials matched via: phrase (mesh = registered under a MeSH descriptor no name phrase would catch; recall-expansion = gene / selected parent terms used only for trials).

Study-type breakdown: 1 interventional · 1 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"acyl-CoA dehydrogenase deficiency"

Query health: suspect — strategies attempted: phrase, recall-expansion; with hits: phrase

Run this search on ClinicalTrials.gov

Synonyms dropped by stoplist: MADD

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • 1 synonym(s) dropped by stoplist (may under-count)
  • No label/synonym collisions with other diseases in this corpus

Ingested 2026-07-26T23:21:32.537Z