Bardet-Biedl Syndrome
Also known as: BBS
Bardet-Biedl Syndrome (BBS) is a rare, genetically heterogeneous disorder characterized by a combination of clinical features, including retinal dystrophy, obesity, polydactyly, cognitive impairment, hypogonadism, and renal abnormalities. The severity and presence of these features can vary significantly among affected individuals.
Imagine your body has tiny helpers that aren't working right. This can make it hard to see, cause you to gain weight easily, and sometimes you might have extra fingers or toes. It can also make learning a little tricky. Doctors can help with special glasses, healthy food, and extra help in school.
Signs & Symptoms
- Retinal dystrophy (progressive vision loss)
- Obesity
- Polydactyly (extra fingers and/or toes)
- Cognitive impairment
- Hypogonadism (delayed or incomplete sexual development)
- Renal abnormalities (kidney disease)
- Learning difficulties
- Speech delay
- Behavioral problems
- Diabetes mellitus
- Hypertension
- Congenital heart defects
Treatment Options
Low-vision aids and orientation/mobility training
SUPPORTIVEDietary management and exercise programs
MODERATELY EFFECTIVEGrowth hormone therapy (for short stature)
MODERATELY EFFECTIVEHormone replacement therapy (for hypogonadism)
HIGHLY EFFECTIVEDialysis or kidney transplantation (for renal failure)
HIGHLY EFFECTIVEManagement of diabetes and hypertension
HIGHLY EFFECTIVEEducational and behavioral therapies
MODERATELY EFFECTIVEEmerging Therapies Targeting Ciliary Dysfunction
EXPERIMENTALDiagnosis
- Clinical evaluation based on the presence of primary features
- Genetic testing to identify mutations in BBS genes
- Ophthalmological examination (electroretinography)
- Renal ultrasound
- Assessment of cognitive function
- Hormonal evaluation
History
Bardet-Biedl Syndrome was first described independently by Georges Bardet in 1920 and Arthur Biedl in 1922. They both reported families with the characteristic features of obesity, polydactyly, retinal dystrophy, and mental retardation.
Recent Breakthroughs
Identification of Novel BBS Gene Mutations
Researchers identified new mutations in known BBS genes and potential candidate genes, expanding the genetic landscape of BBS and improving diagnostic capabilities.
Development of Gene Therapy Approaches for BBS
Preclinical studies have shown promise for gene therapy approaches targeting specific BBS gene mutations, potentially restoring ciliary function and mitigating disease progression.