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Recombinant 8 (rec(8)) syndrome, also known as San Luis Valley syndrome, is a complex chromosomal disorder that is due to a parental pericentric inversion of chromosome 8 and is characterized by major congenital heart anomalies, urogenital malformations, moderate to severe intellectual deficiency and mild craniofacial dysmorphism.
Features include always present findings: Thin upper lip vermilion. 45 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 6 | Seizure, Enlarged brain ventricles (ventriculomegaly), Intellectual disability |
Muscles |
Phenotype severity distribution: 1 always present feature.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for recombinant 8 syndrome.
3 publications have been identified in PubMed for recombinant 8 syndrome. Research spans Case Report / Case Series (33%), Basic Science / Preclinical (33%), and Gene Therapy / Novel Therapeutics (33%).
Edek YC (2024). [PMID: 39122520](https://pubmed.ncbi.nlm.nih.gov/39122520/). *Dermatology practical & conceptual*. [Case Report / Case Series]
Lv LX (2024). [PMID: 38844185](https://pubmed.ncbi.nlm.nih.gov/38844185/). *Fish & shellfish immunology*. [Basic Science / Preclinical]
Zhang T (2024). [PMID: 39049059](https://pubmed.ncbi.nlm.nih.gov/39049059/). *Veterinary research*. [Gene Therapy / Novel Therapeutics]
Data assembled from 5 of 12 sources · Last updated Sep 19, 2026, 12:50 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
4 |
Low muscle tone (hypotonia), Generalized hypotonia, Brain shrinkage (cerebral atrophy) |
Head and neck | 4 | Broad face, Thin upper lip vermilion, Thick lower lip vermilion |
Heart and blood vessels | 2 | Ventricular septal defect, Atrial septal defect |
Growth and development | 2 | Postnatal growth retardation, Growth delay |
Bones and joints | 2 | Sideways curvature of the spine (scoliosis), Joint contracture of the hand |
Arms and legs | 2 | Joint contracture of the hand, Clinodactyly of the 5th finger |
Ears | 1 | Hearing loss (hearing impairment) |
Eyes | 1 | Strabismus |
Kidneys and urinary system | 1 | Abnormality of the genitourinary system |