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ORPHA:33572

5-oxoprolinase deficiency

low confidenceDisorder

Also known as: Oxoprolinuria due to oxoprolinase deficiency

Publications

504

Trials

0

Interventional, condition-specific

Researchers

323

Distinct authors in sample

Gene link

OPLAH

Strong

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A very heterogeneous condition characterized by 5-oxoprolinuria.

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 (5)

5-oxoprolinase deficiency (disease) · inborn 5-oxoprolinase (ATP-hydrolyzing) activity disorder · inborn error of 5-oxoprolinase (ATP-hydrolyzing) activity · oxoprolinuria due to oxoprolinase deficiency · rare inborn error of 5-oxoprolinase (ATP-hydrolyzing) activity

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 identifiedPresent

    Strong — OPLAH

  2. LiteraturePresent

    504 matched papers (401 in last 10 years) Source

  3. Phenotype characterisedPresent

    27 HPO annotations (e.g. Feeding difficulties in infancy; Floppy infant; Excessive daytime somnolence) 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?

Yes — we know a specific gene responsible (OPLAH).

GenCC classification: Strong.

Phenotypes (Monarch / HPO)

27

Associated phenotypes · MONDO:0009825

  • Feeding difficulties in infancy
  • Floppy infant
  • Excessive daytime somnolence
  • Reduced circulating 5-oxoprolinase activity
  • Increased level of L-pyroglutamic acid in urine

Showing 5 of 27 — 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?

504

504 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.

504 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).

401 in the last 10 years · low confidence

Phrase hits: 52 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

323

Distinct author names in 52 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
    Larsson A6 papers · 2007
    Papers in Europe PMC
  2. 02
    Alkuraya FS2 papers · 2016

    Developmental Genetics Unit, Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.

    Papers in Europe PMC
  3. 03
    Artuch R2 papers · 2023

    Department of Clinical Biochemistry, Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, 08950 Barcelona, Spain.

    Papers in Europe PMC
  4. 04
    Bachhawat AK2 papers · 2025
    Papers in Europe PMC
  5. 05
    Calpena E2 papers · 2015

    Genetics and Molecular Medicine Unit, Instituto de Biomedicina de Valencia - CSIC and CIBER de Enfermedades Raras (CIBERER), Valencia, Spain.

    Papers in Europe PMC
  6. 06
    Cao Y2 papers · 2023

    Department of Neonatology, Children's Hospital of Fudan University, 399 Wanyuan Road, Shanghai, 201102, China.

    Papers in Europe PMC
  7. 07
    Carlsson B2 papers · 1997
    Papers in Europe PMC
  8. 08
    Espinós C2 papers · 2015
    Papers in Europe PMC
  9. 09
    Kluijtmans LAJ2 papers · 2023

    Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands.

    Papers in Europe PMC
  10. 10
    Liu Y2 papers · 2023

    Department of Genetics, Jiangxi Maternal and Child Health Hospital, 330006, Nanchang, China.

    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 5-oxoprolinase deficiency — 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.

("5-oxoprolinase deficiency" OR "Oxoprolinuria due to oxoprolinase deficiency" OR "5-oxoprolinase deficiency (disease)") OR ("OPLAH" OR "OPLAH syndrome" OR "OPLAH-related")

Run this search on Europe PMC

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

"5-oxoprolinase deficiency" OR "Oxoprolinuria due to oxoprolinase deficiency" OR "5-oxoprolinase deficiency (disease)"

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: inborn 5-oxoprolinase (ATP-hydrolyzing) activity disorder; inborn error of 5-oxoprolinase (ATP-hydrolyzing) activity; rare inborn error of 5-oxoprolinase (ATP-hydrolyzing) activity

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Publication count (504) is implausibly high for prevalence class "<1 / 1 000 000" — treat as possible over-matching, not a measure of research intensity

Ingested 2026-07-26T23:37:38.377Z