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ORPHA:1035

Beta-mercaptolactate cysteine disulfiduria

low confidenceDisorder

Also known as: 3-mercaptopyruvate sulfurtransferase deficiency · Ampola syndrome · MCDU

Publications

2,361

Trials

0

Interventional, condition-specific

Researchers

38

Distinct authors in sample

Gene link

MPST

No Known Disease Relationship

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

An extremely rare disorder of methionine cycle and sulfur amino acid metabolism characterized by increased urine excretion of beta-mercaptolactate-cysteine disulfide (due to deficiency of mercaptopyruvate sulfurtransferase activity in erythrocytes), leading to a positive cyanide nitroprusside test. Association with , lens dislocation, and behavioral abnormalities has been reported, however the causal link remains to be established. There have been no further descriptions in the literature since 1981.

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.

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

No matched interventional trial; the gene is known and literature exists — preclinical or natural-history work may still be the practical next step.

  1. Gene identifiedPartial

    No Known Disease Relationship — MPST

  2. LiteraturePresent

    2,361 matched papers (1,670 in last 10 years) Source

  3. Phenotype characterisedPresent

    31 HPO annotations (e.g. High forehead; Micromelia; Abnormality of the ureter) Source

  4. Animal modelNot found

    No Alliance genotype “model of” associations via Monarch for these Mondo IDs

  5. Orphan designationNot found

    No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source

  6. Interventional trialNot found

    No matched interventional trial under our ClinicalTrials.gov rules

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?

Not yet — the cause hasn't been pinned down in GenCC.

No strong gene–disease assertion joined for this Orphanet entity.

Phenotypes (Monarch / HPO)

31

Associated phenotypes · MONDO:0009585

  • High forehead
  • Micromelia
  • Abnormality of the ureter
  • Obesity
  • Posteriorly rotated ears

Showing 5 of 31 — open Monarch for the full list.

Animal models (Monarch / Alliance)

None returned for this Mondo ID. Empty here is not proof that no model organism work exists under another name or gene.

Monarch fetch 2026-07-29

Therapies

Designations, candidates, and chemicals

FDA OOPD and EMA orphan designations, Open Targets clinical candidates, and CTD chemical associations via MyDisease.info. These never change the interventional-trial headline.

Orphan designation (FDA · EMA)

No designation matched this disease via UMLS or preferred name on the FDA OOPD mirror or EMA orphan register. Absence here is not proof that none exists under another wording.

Open Targets candidates

No drugs or clinical candidates returned for this Mondo ID on Open Targets.

CTD chemicals (MyDisease.info)

No CTD chemical associations returned for this Mondo ID.

Literature

Is anyone studying this?

2,361

2,361 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=3967) is 59.

2,361 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 59 (publications denominator n=3967).

1,670 in the last 10 years · low confidence

Phrase hits: 7 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

38

Distinct author names in 7 sampled papers — named people below.

Who's working on it?

No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.

  1. 01
    Nagahara N2 papers · 2020

    Isotope Research Center, Nippon Medical School, Tokyo, Japan.

    Papers in Europe PMC
  2. 02
    Ahmad A1 paper · 2019

    Department of Anesthesiology, The University of Texas Medical Branch, Galveston.

    Papers in Europe PMC
  3. 03
    Baerlocher K1 paper · 1973
    Papers in Europe PMC
  4. 04
    Bertrand J1 paper · 2020

    Department of Orthopaedic Surgery, Otto-von-Guericke University, Magdeburg, Germany.

    Papers in Europe PMC
  5. 05
    Busso N1 paper · 2020

    Service of Rheumatology, Department of Musculoskeletal Medicine, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland. Nathalie.Busso@chuv.ch.

    Papers in Europe PMC
  6. 06
    Calzia E1 paper · 2019

    Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany.

    Papers in Europe PMC
  7. 07
    Chatzianastasiou A1 paper · 2020

    First Department of Critical Care and Pulmonary Services, Faculty of Medicine, National and Kapodistrian University of Athens, Athens, Greece.

    Papers in Europe PMC
  8. 08
    Cirino G1 paper · 2020

    Department of Pharmacy, University of Naples Federico II, Naples, Italy.

    Papers in Europe PMC
  9. 09
    Druzhyna N1 paper · 2019

    Department of Anesthesiology, The University of Texas Medical Branch, Galveston.

    Papers in Europe PMC
  10. 10
    Ehirchiou D1 paper · 2020

    Service of Rheumatology, Department of Musculoskeletal Medicine, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland.

    Papers in Europe PMC

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).

Data as of 11 September 2026 · last trial check 11 September 2026

No matched interventional trials. This is true for 77.2% of diseases in the trials denominator (5501 of 7126). Here are the researchers publishing on it.

low confidence · 38.6th percentile (trials denominator)

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.

See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.

Other registries (secondary)

Broader net from EU CTIS, ISRCTN, and ICTRP when available — deduped against ClinicalTrials.gov IDs already counted above. Dual-model LLM relevance gates what we keep. These rows are not added to the interventional headline.

raw 0 · after dedupe 0 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 0 · dropped 0 · fetched 2026-07-29

Source notes: ictrp: Error: ICTRP public search unavailable (WHO portal is SPA-only; SOAP needs partnership). Tried: https://apps.who.int/tri

No secondary-registry studies passed dual-model relevance for this condition name (after dedupe).

Where to find support

Condition-specific patient organisations, when Orphanet lists them, are on the disease’s Orphanet page. We also link umbrella groups that support undiagnosed and ultra-rare families.

Orphanet entry for Beta-mercaptolactate cysteine disulfiduria — check Associations / patient organisations on that page.

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.

("Beta-mercaptolactate cysteine disulfiduria" OR "3-mercaptopyruvate sulfurtransferase deficiency" OR "Ampola syndrome") OR ("MPST" OR "MPST syndrome" OR "MPST-related")

Run this search on Europe PMC

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

"Beta-mercaptolactate cysteine disulfiduria" OR "3-mercaptopyruvate sulfurtransferase deficiency" OR "Ampola syndrome"

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

Query health: ok — strategies attempted: phrase; with hits: phrase

Run this search on ClinicalTrials.gov

Synonyms dropped by stoplist: MCDU

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
  • Publication count (2361) is implausibly high for prevalence class "<1 / 1 000 000" — treat as possible over-matching, not a measure of research intensity

Ingested 2026-07-26T16:15:00.401Z