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ORPHA:30

Hereditary orotic aciduria

low confidenceDisorder

Also known as: Orotidylic decarboxylase deficiency · Uridine monophosphate synthetase deficiency

Publications

1,837

Trials

1

Interventional, condition-specific

Researchers

1,306

Distinct authors in sample

Gene link

UMPS

Definitive

Readiness

5/6

Stages with a signal

Clinical definition (Orphanet)

A rare genetic disorder of pyrimidine metabolism characterized by early onset of megaloblastic anemia, global , and , associated with massive urinary overexcretion of orotic acid (sometimes with orotic acid crystalluria). Patients without megaloblastic anemia, but with additional manifestations such as , have also been reported.

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)

Hereditary Orotic Aciduria · orotic aciduria · oroticaciduria · orotidylic decarboxylase deficiency · uridine monophosphate synthetase 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.”

5/6 stages with a signal

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

  1. Gene identifiedPresent

    Definitive — UMPS

  2. LiteraturePresent

    1,837 matched papers (1,008 in last 10 years) Source

  3. Phenotype characterisedPresent

    30 HPO annotations (e.g. Global developmental delay; Reduced orotidine 5-prime phosphate decarboxylase level; Hematuria) Source

  4. Animal modelNot found

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

  5. Orphan designationPartial

    1 FDA · 1 EMA designations (none yet with FDA orphan-indication approval) — e.g. uridine triacetate Source

  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 (UMPS).

GenCC classification: Definitive.

Phenotypes (Monarch / HPO)

30

Associated phenotypes · MONDO:0009797

  • Global developmental delay
  • Reduced orotidine 5-prime phosphate decarboxylase level
  • Hematuria
  • Anisocytosis
  • Hypochromia

Showing 5 of 30 — 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)

2

Designations · no FDA orphan-indication approval yet

  • EMA uridine triacetateTreatment of hereditary orotic aciduria · 28/06/2024 · PositiveEMA designation
  • FDA uridine triacetateOROTIC ACIDURIA · 2013-08-09

Sources: FDA OOPD · EMA orphan designations

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?

1,837

1,837 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.

1,837 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).

1,008 in the last 10 years · low confidence

Phrase hits: 567 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,306

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
    Wang Y7 papers · 2026

    Department of Surgery, Huashan Hospital, Fudan University, Shanghai, China.

    Papers in Europe PMC
  2. 02
    Zhang Y7 papers · 2025

    Key Laboratory of Livestock and Poultry Multi-omics of MARA, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, 250100, People's Republic of China.

    Papers in Europe PMC
  3. 03
    Li Y6 papers · 2026

    Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Guangdong-Hong Kong Joint Laboratory for RNA Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.

    Papers in Europe PMC
  4. 04
    Li X5 papers · 2025

    Department of Physiology and Pathophysiology of School of Basic Medical Sciences, Cancer Institute of Shanghai Cancer Center, Fudan University, Shanghai, China.

    Papers in Europe PMC
  5. 05
    Wang X5 papers · 2025

    Key Laboratory of Livestock and Poultry Multi-omics of MARA, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, 250100, People's Republic of China.

    Papers in Europe PMC
  6. 06
    Wu L5 papers · 2026

    The Center for Medical Genetics, Hunan Key Laboratory of Medical Genetics & Hunan Key Laboratory of Animal Models for Human Diseases, School of Life Sciences, Central South University, Changsha, Hunan, China.

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

    Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, 55905, USA.

    Papers in Europe PMC
  8. 08
    Chen Y4 papers · 2026

    Key Laboratory of Livestock and Poultry Multi-omics, Ministry of Agriculture and Rural Affairs, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China.

    Papers in Europe PMC
  9. 09
    Cui Y4 papers · 2026

    Laboratory of Clinical Medicine, Air Force Medical Center, PLA, Air Force Medical University, Fu Cheng Rd. 28, Beijing 100142, China.

    Papers in Europe PMC
  10. 10
    Liu Y4 papers · 2026

    Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Guangdong-Hong Kong Joint Laboratory for RNA Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.

    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.

Data as of 11 September 2026 · last trial check 28 July 2026

1 interventional trial — more than 77.2% of diseases in the trials denominator have none at all (5501 of 7126; this disease is at the 80.1th percentile).

low confidence · 80.1th 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.

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.

Recruiting or not-yet-recruiting

Open the complete matched search on ClinicalTrials.gov

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 Hereditary orotic aciduria — 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.

("Hereditary orotic aciduria" OR "Orotidylic decarboxylase deficiency" OR "Uridine monophosphate synthetase deficiency" OR "orotic aciduria" OR "oroticaciduria") OR ("UMPS" OR "UMPS syndrome" OR "UMPS-related")

Run this search on Europe PMC

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

"Hereditary orotic aciduria" OR "Orotidylic decarboxylase deficiency" OR "Uridine monophosphate synthetase deficiency" OR "orotic aciduria" OR "oroticaciduria"

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.

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

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
  • Publication count (1837) is implausibly high for prevalence class "<1 / 1 000 000" — treat as possible over-matching, not a measure of research intensity

Ingested 2026-07-26T12:09:13.346Z