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ORPHA:659702

Intrauterine growth retardation-micrognathia-short stature-facial dysmorphism-rhizomelic shortening syndrome

low confidenceDisorder

Also known as: ARCN1-related syndrome

Publications

534

Trials

0

Interventional, condition-specific

Researchers

132

Distinct authors in sample

Gene link

ARCN1

Strong

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A rare multiple anomalies/ syndrome characterized by intrauterine growth restriction, microcephaly, short stature, rhizomelic shortening and facial dysmorphism (including prominent forehead, downslanted palpebral fissures, bulbous nasal tip, large or prominent ears and notably severe micrognathia). is commonly reported, may also be present. Additional clinical features may include genitourinary malformations in males, transient liver dysfunction, glycosylation abnormalities, giant cell hepatitis, hepatoblastoma, and cataracts. Severity of the disease varies from mild to very severe which may lead to intrauterine death or stillbirth in some cases.

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 (3)

SRMMD · short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay · short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay; SRMMD

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 — ARCN1

  2. LiteraturePresent

    534 matched papers (392 in last 10 years) Source

  3. Phenotype characterisedPresent

    44 HPO annotations (e.g. Scaphocephaly; Metaphyseal widening; Large hands) 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 (ARCN1).

GenCC classification: Strong.

Phenotypes (Monarch / HPO)

44

Associated phenotypes · MONDO:0014948

  • Scaphocephaly
  • Metaphyseal widening
  • Large hands
  • Astigmatism
  • Strabismus

Showing 5 of 44 — 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?

534

534 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.

534 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).

392 in the last 10 years · low confidence

Phrase hits: 12 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

132

Distinct author names in 12 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
    Izumi K2 papers · 2022

    Research Center for Epigenetic Disease, Institute of Molecular and Cellular Biosciences, The University of Tokyo, Tokyo 113-0032, Japan; Division of Medical Genetics, Nagano Children's Hospital, Azumino 399-8205, Japan; Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA. Electronic address: izumik1@email.chop.edu.

    Papers in Europe PMC
  2. 02
    Ackermann AM1 paper · 2022

    Division of Endocrinology and Diabetes, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA.

    Papers in Europe PMC
  3. 03
    Akiyama T1 paper · 2016

    Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, University of Tokyo, Tokyo 113-0032, Japan.

    Papers in Europe PMC
  4. 04
    Alajaji S1 paper · 2021

    King Saud bin Abdulaziz University for Health Sciences, Ministry of National Guard Health Affairs (MNGHA), Riyadh, Saudi Arabia.

    Papers in Europe PMC
  5. 05
    Alfadhel M1 paper · 2021

    Division of Genetics, Department of Pediatrics, King Abdullah Specialized Children Hospital, King Abdulaziz Medical City, Ministry of National Guard Health Affairs (MNGHA), Riyadh, Saudi Arabia.

    Papers in Europe PMC
  6. 06
    Alfares A1 paper · 2021

    Department of Pediatrics, College of Medicine, Qassim University, Qassim, Saudi Arabia.

    Papers in Europe PMC
  7. 07
    Aloraini T1 paper · 2021

    Department of Pathology and Laboratory Medicine, King Abdulaziz Medical City, Riyadh, Saudi Arabia.

    Papers in Europe PMC
  8. 08
    AlSubaie L1 paper · 2021

    Division of Genetics, Department of Pediatrics, King Abdullah Specialized Children Hospital, King Abdulaziz Medical City, Ministry of National Guard Health Affairs (MNGHA), Riyadh, Saudi Arabia.

    Papers in Europe PMC
  9. 09
    Amin S1 paper · 2025

    Human Technopole, Milan, Italy.

    Papers in Europe PMC
  10. 10
    Arakawa M1 paper · 2016

    Division of Medical Genetics, Nagano Children's Hospital, Azumino 399-8205, Japan.

    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 2026-07-30

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).

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 Intrauterine growth retardation-micrognathia-short stature-facial dysmorphism-rhizomelic shortening 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.

("Intrauterine growth retardation-micrognathia-short stature-facial dysmorphism-rhizomelic shortening syndrome" OR "ARCN1-related syndrome" OR "SRMMD" OR "short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay" OR "short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay; SRMMD") OR ("ARCN1" OR "ARCN1 syndrome" OR "ARCN1-related")

Run this search on Europe PMC

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

"Intrauterine growth retardation-micrognathia-short stature-facial dysmorphism-rhizomelic shortening syndrome" OR "ARCN1-related syndrome" OR "SRMMD" OR "short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay" OR "short stature, rhizomelic, with microcephaly, micrognathia, and developmental delay; SRMMD"

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
  • Publication count (534) is implausibly high for prevalence class "<1 / 1 000 000" — treat as possible over-matching, not a measure of research intensity

Ingested 2026-07-27T20:06:55.791Z