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Bowen-Conradi syndrome (BCS) is a lethal autosomal recessive ribosomal biogenesis disorder characterized by severe prenatal and postnatal growth retardation, microcephaly, a distinctive facial appearance, extreme psychomotor delay, hip and knee contractures and rockerbottom feet.
Features include: Microcephaly, Rocker bottom foot, Small for gestational age, and Prominent nose and 3 more.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Arms and legs | 2 | Rocker bottom foot, Clinodactyly of the 5th finger |
Head and neck |
EMG1 encodes EMG1 N1-specific pseudouridine methyltransferase (244 aa). S-adenosyl-L-methionine-dependent pseudouridine N(1)-methyltransferase that methylates pseudouridine at position 1248 (Psi1248) in 18S rRNA. Highest expression in Cells EBV-transformed lymphocytes (40.3 TPM) and Cells Cultured fibroblasts (38.5 TPM).
Bowen-Conradi syndrome is strongly associated with mutations in the EMG1 gene on chromosome 12.
EMG1 is classified as a druggable target with score 0.0.
Genetic testing for EMG1 is available. Testing is considered confirmatory for diagnosis.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Bowen-Conradi syndrome.
2 publications have been identified in PubMed for Bowen-Conradi syndrome. Research spans Basic Science / Preclinical (100%).
Kimura-Yoshida C (2025). [PMID: 40761126](https://pubmed.ncbi.nlm.nih.gov/40761126/). *Development*. [Basic Science / Preclinical]
Flentke GR (2024). [PMID: 38941348](https://pubmed.ncbi.nlm.nih.gov/38941348/). *PLoS One*. [Basic Science / Preclinical]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 6:54 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Bowen-Conradi syndrome
1
Microcephaly |
Bones and joints | 1 | Abnormal joint morphology |