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ORPHA:3355

Trichoodontoonychial dysplasia

high confidenceDisorder

Also known as: Trichoodontoonychial dysplasia with bone deficiency in frontoparietal region

Publications

33

31.9th percentile

Trials

0

Interventional, condition-specific

Researchers

192

Distinct authors in sample

Gene link

—

Readiness

1/6

Stages with a signal

Clinical definition (Orphanet)

Trichoodontoonychial is a rare ectodermal syndrome characterized by severe generalized hypotrichosis, parietal alopecia, secondary anodontia resulting from enamel hypoplasia, onychodystrophy, bone deficiency in the frontoparietal region and skin manifestations (incl. nevus pigmentosus, papules, ephelides, palmoplantar keratosis, supernumerary nipples, abnormal dermatoglyphics). There have been no further descriptions in the literature since 1983.

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 (1)

trichoodontoonychial dysplasia with bone deficiency in frontoparietal region

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

Research-stage checklist from open sources (GenCC, literature, Monarch when enriched, ClinicalTrials.gov). Not a prognosis or care recommendation.

  1. Gene identifiedNot found

    No GenCC disease–gene assertion in this build

  2. LiteraturePresent

    33 matched papers (14 in last 10 years) Source

  3. Phenotype characterisedNot found

    No HPO disease–phenotype associations via Monarch for these Mondo IDs

  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)

None returned for this Mondo ID. That often means “not linked under this ID,” not “no clinical features.”

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?

33

33 papers have ever been published on this condition (under this name). For scale, breast cancer has over 700,000. Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

33 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).

14 in the last 10 years · high confidence · 31.9th percentile (publications denominator)

Phrase hits: 33 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

192

Distinct author names in 33 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
    Abdullah A1 paper · 2023

    Division of Orthopaedic and Traumatology, Department of Surgery, Persahabatan General Hospital, Jakarta, Indonesia.

    Papers in Europe PMC
  2. 02
    Acevedo AC1 paper · 2023

    Laboratory of Oral Histopathology, Oral Care Center for Inherited Diseases, Health Sciences Faculty, University of Brasilia, Brasilia 70040-010, Brazil.

    Papers in Europe PMC
  3. 03
    Agrawal KU1 paper · 2022

    Ocular Oncology Service, Wills Eye Hospital, Thomas Jefferson University, 840 Walnut Street, 14th Floor, Philadelphia, PA, 19107, USA.

    Papers in Europe PMC
  4. 04
    Ali SR1 paper · 2021

    Internal Medicine, Dow University of Health Sciences, Civil Hospital Karachi, Karachi, PAK.

    Papers in Europe PMC
  5. 05
    Anvekar P1 paper · 2021

    Pediatrics, Mahatma Gandhi Mission Medical College and Hospital, Mumbai, IND.

    Papers in Europe PMC
  6. 06
    Arsenic R1 paper · 2013

    Institute of Pathology, Cantonal Hospital Aarau, Aarau, Switzerland. ruza.arsenic@charite.de

    Papers in Europe PMC
  7. 07
    Avillach P1 paper · 2024

    Department of Biomedical Informatics, Harvard Medical School, Boston, MA, 02115, USA. Paul_Avillach@hms.harvard.edu.

    Papers in Europe PMC
  8. 08
    Bara-Casaus J1 paper · 2025

    Department of Oral and Maxillofacial Surgery, Hospital Univeritari Mutua Terrassa, 08221 Barcelona, Spain.

    Papers in Europe PMC
  9. 09
    Baruchin AM1 paper · 1986
    Papers in Europe PMC
  10. 10
    Batory I1 paper · 1982
    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.

high 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 Trichoodontoonychial dysplasia — 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.

"Trichoodontoonychial dysplasia" OR "Trichoodontoonychial dysplasia with bone deficiency in frontoparietal region"

Run this search on Europe PMC

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

"Trichoodontoonychial dysplasia" OR "Trichoodontoonychial dysplasia with bone deficiency in frontoparietal region"

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

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus

Ingested 2026-07-26T22:58:42.263Z