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A X-linked yndrome characterized by intellectual deficit, truncal obesity, characteristic facial features, hypogonadism, tapered fingers and short toes.
Features include very common findings: Low muscle tone (hypotonia), Coarse facial features, Gynecomastia, and Tapered finger and others; and common findings: Blepharophimosis, Prominent supraorbital ridges, Deeply set eye, and Ptosis and others. 52 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Arms and legs | 7 | Widely spaced toes, Shortening of all middle phalanges of the fingers, Shortening of all distal phalanges of the fingers |
Bones and joints | 6 | Scheuermann-like vertebral changes, Sideways curvature of the spine (scoliosis), Excessive outward curvature of the upper spine (kyphosis) |
Brain and nerves | 4 | Seizure, Severe intellectual disability, Intellectual disability |
Head and neck | 4 | Coarse facial features, Microcephaly, Orofacial cleft |
Eyes | 4 | Nystagmus, Ptosis, Visual impairment |
Muscles | 3 | Low muscle tone (hypotonia), Generalized hypotonia, Skeletal muscle atrophy |
Hormones | 2 | Delayed puberty, Hypogonadism |
Growth and development | 1 | Short stature |
Ears | 1 | Hearing loss (hearing impairment) |
Digestive system | 1 | Feeding difficulties in infancy |
PHF6 function has not been fully characterized.
Borjeson-Forssman-Lehmann syndrome is caused by mutations in the PHF6 gene on chromosome X.
Genetic testing for PHF6 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Borjeson-Forssman-Lehmann syndrome has been reported in the published literature.
Phenotype severity distribution: 16 very common features, 6 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Borjeson-Forssman-Lehmann syndrome.
6 publications have been identified in PubMed for Borjeson-Forssman-Lehmann syndrome. Research spans Case Report / Case Series (50%), Basic Science / Preclinical (33%), and Diagnostic / Biomarker (17%).
Silva MF (2026). [PMID: 41694865](https://pubmed.ncbi.nlm.nih.gov/41694865/). *Cureus*. [Case Report / Case Series]
Wang J (2026). [PMID: 41876547](https://pubmed.ncbi.nlm.nih.gov/41876547/). *Nat Commun*. [Basic Science / Preclinical]
Dutta D (2026). [PMID: 41741118](https://pubmed.ncbi.nlm.nih.gov/41741118/). *BMJ Case Rep*. [Case Report / Case Series]
Ramsey K (2025). [PMID: 40869981](https://pubmed.ncbi.nlm.nih.gov/40869981/). *Genes (Basel)*. [Case Report / Case Series]
McRae HM (2024). [PMID: 39405291](https://pubmed.ncbi.nlm.nih.gov/39405291/). *PLoS Genet*. [Basic Science / Preclinical]
Vos N (2024). [PMID: 38787418](https://pubmed.ncbi.nlm.nih.gov/38787418/). *Hum Genet*. [Diagnostic / Biomarker]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 4:21 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Borjeson-Forssman-Lehmann syndrome