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ORPHA:88637

Hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome

low confidenceSubtype of disorder

Also known as: 4H syndrome

Publications

132

Trials

0

Interventional, condition-specific

Researchers

958

Distinct authors in sample

Gene link

—

Readiness

1/6

Stages with a signal

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

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

    132 matched papers (85 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?

132

132 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.

132 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).

85 in the last 10 years · low confidence

Phrase hits: 132 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

958

Distinct author names in 132 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
    Vanderver A19 papers · 2021

    Department of Neurology, Children's National Health System, Washington, DC, USA.

    Papers in Europe PMC
  2. 02
    Bernard G17 papers · 2023

    Departments of Pediatrics, Neurology and Neurosurgery, Montreal Children's Hospital, McGill University Health Center, Montreal, Canada.

    Papers in Europe PMC
  3. 03
    Wolf NI12 papers · 2023

    Department of Child Neurology, and Amsterdam Neuroscience, VU University Medical Center, De Boelelaan 1117, 1081 HV, Amsterdam, the Netherlands. n.wolf@vumc.nl.

    Papers in Europe PMC
  4. 04
    Schiffmann R10 papers · 2019

    Institute of Metabolic Disease, Baylor Research Institute, Dallas, TX, USA.

    Papers in Europe PMC
  5. 05
    van der Knaap MS7 papers · 2016

    Department of Child Neurology, VU University Medical Center, Amsterdam, The Netherlands.

    Papers in Europe PMC
  6. 06
    Brais B6 papers · 2021

    Montreal Neurological Institute, McGill University, Montreal, QC, Canada.

    Papers in Europe PMC
  7. 07
    Houlden H5 papers · 2024

    Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK.

    Papers in Europe PMC
  8. 08
    Pizzino A5 papers · 2020

    Department of Neurology, Children's National Health System, Washington, DC, USA.

    Papers in Europe PMC
  9. 09
    Tonduti D5 papers · 2017

    Child Neuropsychiatry Unit, Department of Brain and Behavioral Sciences, University of Pavia, Italy; Department of Child Neurology, Fondazione IRCCS Istituto Neurologico "Carlo Besta", Milan, Italy.

    Papers in Europe PMC
  10. 10
    Boespflug-Tanguy O4 papers · 2015

    Department of Pediatric Neurology and Metabolic Disorders, French Reference Center for Leukodystrophies, Robert Debré Hospital, Paris, France; Inserm UMR1141 Neuroprotect, Paris Diderot University, Sorbonne Cite, Paris, France.

    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. 2 observational studies did — shown below because natural-history and cohort work can be an important step toward a trial.

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.

Observational and natural-history studies

2 observational studies match 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 13 · after dedupe 13 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 13 · dropped 0 · fetched 2026-07-30

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).

Uncertain / not reviewed (13)

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 Hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome — 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.

"Hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome" OR "4H syndrome"

Run this search on Europe PMC

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

"Hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome" OR "4H syndrome"

Study-type breakdown: 0 interventional · 2 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
  • "4H syndrome" also appears on ORPHA:137639
  • No Orphanet definition and no Mondo IDs — likely taxonomy scaffolding; confidence capped at low

Ingested 2026-07-27T03:23:58.024Z