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A rare disorder characterized by multiple congenital anomalies, including short stature, hyperextensibility of joints, ocular depression, Rieger anomaly and teething delay in which the cause of the disease is a mutation in PIK3R1 gene. Other common manifestations of SHORT syndrome are mild intrauterine growth restriction, partial lipodystrophy, delayed bone age, hernias and a recognizable facial gestalt.
Features include always present findings: Delayed eruption of teeth, Absence of subcutaneous fat, Delayed skeletal maturation, and Short chin and others; and very common findings: Prominent forehead, High hypermetropia, Midface retrusion, and Hypermetropia and others. 76 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Skin | 6 | Absence of subcutaneous fat, Reduced subcutaneous adipose tissue, Thin skin |
Bones and joints | 4 | Delayed skeletal maturation, Joint hypermobility, Slender long bone |
Brain and nerves | 3 | Mild intellectual disability, Delayed speech and language development, Abnormal speech pattern |
Eyes | 3 | Cataract, Glaucoma, Cloudy or opaque cornea (corneal opacity) |
Hormones | 3 | Insulin-resistant diabetes mellitus, Insulin resistance, Diabetes mellitus |
Head and neck | 3 | Triangular face, Abnormality of the face, Abnormal mandible morphology |
Growth and development | 3 | Intrauterine growth retardation, Severe short stature, Weight loss |
Arms and legs | 1 | Radial deviation of finger |
Ears | 1 | Inner ear hearing loss (sensorineural hearing impairment) |
Immune system | 1 | Abnormality of the immune system |
PIK3R1-related SHORT syndrome is characterized by characteristic facial features, mild-to-moderate growth deficiency, partial lipodystrophy, insulin resistance, and diabetes by early adulthood. Other frequent features include delayed dentition and other dental issues, Axenfeld-Rieger anomaly or related ocular anterior chamber dysgenesis, and sensorineural hearing loss. To date, a pathogenic variant in PIK3R1 has been identified in 61 affected individuals [, , , , , , , , , , , , , , , , ]. The following description of the phenotypic features associated with this condition is based on these reports.
Table 2.
PIK3R1-Related SHORT Syndrome: Frequency of Select Features
Feature | % of Persons w/Feature
Facial gestalt | 100%
Delayed dentition | 94%
Partial lipodystrophy | 87%
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
PIK3R1 function has not been fully characterized.
SHORT syndrome is associated with mutations in the PIK3R1 gene on chromosome 5.
To date, no clear clinically relevant genotype-phenotype correlation is evident; however, PIK3R1-related SHORT syndrome pathogenic variants appear to cluster in the C-terminal SH2 domain of PIK3R1.
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
The penetrance of PIK3R1-related SHORT syndrome appears complete.
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
No consensus clinical diagnostic criteria for PIK3R1-related SHORT syndrome have been published.
PIK3R1-related SHORT syndrome should be suspected in probands with the following clinical features and family history.
Clinical features
Characteristic facial features : triangular face, broad forehead, deep-set eyes, narrow nasal tip, thin nasal alae, low-hanging columella, downturned corners of the mouth, chin dimple, and prominent ears
Delayed dentition
Partial lipodystrophy
Intrauterine growth restriction
Short stature
Insulin resistance/ diabetes mellitus
Axenfeld-Rieger anomaly or related anterior chamber ocular anomalies
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
provides a comparative analysis of genetic disorders with some clinical similarities to PIK3R1-related SHORT syndrome. Table 4. PIK3R1-Related SHORT Syndrome: Differential Diagnosis
Gene(s)/Genetic Mechanism | Disorder | MOI | Features of Disorder |
|---|---|---|---|
Overlapping w/PIK3R1-related SHORT syndrome | Distinguishing from PIK3R1-related SHORT syndrome Genetic mechanisms incl:abnormal methylation of 11p15.5, upd(7)mat1 | Silver-Russell syndrome (SRS) | See footnote 2. |
BSCL2 |
Genetic testing for PIK3R1 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for SHORT syndrome has been reported in the published literature.
No approved treatments are currently available for SHORT syndrome. The disease remains an area of unmet medical need.
No clinical practice guidelines for PIK3R1-related SHORT syndrome have been published. In the absence of published guidelines, the following recommendations are based on the authors' personal experience managing individuals with this disorder.
To establish the extent of disease and needs in an individual diagnosed with PIK3R1-related SHORT syndrome, the evaluations summarized (if not performed as part of the evaluation that led to the diagnosis) are recommended.
Table 5.
PIK3R1-Related SHORT Syndrome: Recommended Evaluations Following Initial Diagnosis
System/Concern | Evaluation | Comment
| Assess length, weight, BMI. |
Insulin resistance/
| • Assessment by endocrinologist
Consideration of fasting glucose oral glucose tolerance test
| Beginning at age 10 yrs
| Exam by ophthalmologist experienced in mgmt of developmental eye disorders or glaucoma | To assess for Axenfeld-Rieger anomaly or related anterior chamber ocular anomalies
| Dental exam for delayed dentition other dental issues | Beginning at age 1 yr
| Hearing assessment |
| Assess speech language in those w/evidence of DD. |
| Echocardiogram |
| • Assess for joint laxity.
Clinical assessment for hernia
|
| Assess frequency types of infections. |
| Consider kidney ultrasound. | Nephrocalcinosis reported in 1 family to date.
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
Given the increased risk for insulin resistance in individuals taking growth hormone, it has been suggested that growth hormone is contraindicated in individuals with PIK3R1-related SHORT syndrome . Three reports observed a worsening of insulin resistance in individuals with PIK3R1-related SHORT syndrome treated with metformin .
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
Search ClinicalTrials.gov in the US and EU Clinical Trials Register in Europe for access to information on clinical studies for a wide range of diseases and conditions. Note: There may not be clinical trials for this disorder.
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
View trials for SHORT syndrome
To monitor existing manifestations, the individual's response to supportive care, and the emergence of new manifestations, the evaluations summarized in are recommended. Table 7. PIK3R1-Related SHORT Syndrome: Recommended Surveillance
System/Concern | Evaluation | Frequency |
|---|---|---|
Growth deficiency | Monitor growth incl height, weight, BMI. | Every 6-12 mos |
Insulin resistance | Oral glucose tolerance test | Every 5 yrs in absence of diabetes |
Diabetes | Fasting glucose, insulin, Hgb A1c | Annually starting in later childhood (age 10 yrs) |
Eye abnormality | Eye exam incl measurement of intraocular pressure | Annually |
Dental | Dental exam | Every 6 mos |
Hearing loss | Hearing assessment | Every 2-3 yrs Connective tissue differences |
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"
Phenotype severity distribution: 12 always present features, 6 very common features, 22 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for SHORT syndrome.
164 publications have been identified in PubMed for SHORT syndrome. Research spans Review / Meta-Analysis (51%), Basic Science / Preclinical (19%), and Case Report / Case Series (12%).
Research Type | Count | % of Total |
|---|---|---|
Research summaries | 84 | 51% |
Laboratory research | 31 | 19% |
Patient case studies | 19 | 12% |
Disease patterns and progression | 12 | 7% |
Testing and diagnosis research | 9 | 5% |
Other research | 6 | 4% |
Clinical study results | 3 | 2% |
Chaturvedi R (2026). [PMID: 41948357](https://pubmed.ncbi.nlm.nih.gov/41948357/). *JCEM Case Rep*. [Case Report / Case Series]
Amado C (2026). [PMID: 40975490](https://pubmed.ncbi.nlm.nih.gov/40975490/). *Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology*. [Case Report / Case Series]
Ferri C (2026). [PMID: 41798958](https://pubmed.ncbi.nlm.nih.gov/41798958/). *Front Immunol*. [Review / Meta-Analysis]
Anderson EN (2026). [PMID: 41468891](https://pubmed.ncbi.nlm.nih.gov/41468891/). *American journal of human genetics*. [Basic Science / Preclinical]
Lee S (2026). [PMID: 41206258](https://pubmed.ncbi.nlm.nih.gov/41206258/). *Am J Geriatr Psychiatry*. [Review / Meta-Analysis]
Papazachariou A (2026). [PMID: 41128447](https://pubmed.ncbi.nlm.nih.gov/41128447/). *Curr Opin Clin Nutr Metab Care*. [Review / Meta-Analysis]
Buel KL (2026). [PMID: 41569909](https://pubmed.ncbi.nlm.nih.gov/41569909/). *FP Essent*. [Review / Meta-Analysis]
Molteni R (2025). [PMID: 40195449](https://pubmed.ncbi.nlm.nih.gov/40195449/). *Nature medicine*. [Clinical Trial Publication]
Garcia-Diez AI (2025). [PMID: 40610162](https://pubmed.ncbi.nlm.nih.gov/40610162/). *Magnetic resonance imaging clinics of North America*. [Review / Meta-Analysis]
Patel R (2025). [PMID: 40204117](https://pubmed.ncbi.nlm.nih.gov/40204117/). *Journal of neuroradiology = Journal de neuroradiologie*. [Basic Science / Preclinical]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 2:52 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about SHORT syndrome
AR |
BSCL is usually diagnosed at birth or shortly thereafter; severe BSCL may have prenatal onset w/IUGR.; All children w/neonatal or infantile presentation demonstrate lipoatrophy in 1st yr of life.; Insulin resistance subsequent diabetes mellitus become common in late adolescence early adulthood. |
PITX3 | Nonsyndromic anterior chamber eye anomalies (OMIM PS107250) | ADAR | Anterior chamber eye anomalies |
IGF1R4 | Nonsyndromic IUGR5 | AD | IUGR, short stature; Glucose intolerance |
Alagille syndrome | AD | Ocular dental findings may be similar.; Facial features can be similar (triangular face, broad forehead, deep-set eyes); Postnatal poor weight gain growth deficiency | Liver disease in Alagille syndrome |
LMNA | Hutchinson-Gilford progeria syndrome (HGPS) | AD | Micrognathia; Short stature; Absence of subcutaneous fat; Some features of accelerated aging w/disease progression in HGPS are distinct from those in PIK3R1-related SHORT syndrome. |
PTPN11 | SHORT-like syndrome6 | AD | IUGR, short stature; Lipoatrophy; Metabolic abnormalities |
SRCAP-related Floating-Harbor syndrome | AD | Low birth weight postnatal growth deficiency; Triangular face, deep-set eyes | Abnormalities of clavicle; Intellectual disability (typically mild to moderate); Expressive language delay |
UBR1 | Johansson-Blizzard syndrome (OMIM 243800) | AR | IUGR, short stature; Hypoplastic alae nasi; Hypodontia; Hearing loss |
Source: GeneReviews — "PIK3R1-Related SHORT Syndrome"