Laurence–Moon syndrome

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Laurence-Moon-Biedl Syndrome 1

Laurence–Moon syndrome is a rare genetic disorder that is characterized by a combination of symptoms affecting multiple body systems. It is considered a variant of Bardet–Biedl syndrome (BBS), although it has distinct features. The syndrome is named after the British doctors John Zachariah Laurence and Robert Charles Moon, who first described the condition in the 19th century.

Clinical Features

The primary features of Laurence–Moon syndrome include:

• Retinitis pigmentosa: A progressive degeneration of the retina leading to vision loss.
• Hypogonadism: Underdevelopment of the sex glands, resulting in reduced fertility.
• Intellectual disability: Varying degrees of cognitive impairment.
• Spastic paraplegia: Stiffness and weakness in the legs, leading to difficulty walking.
• Obesity: Excessive body weight, often beginning in childhood.

Genetics

Laurence–Moon syndrome is inherited in an autosomal recessive manner. This means that an individual must inherit two copies of the defective gene, one from each parent, to manifest the disease. The specific genes involved in Laurence–Moon syndrome are not as well characterized as those in Bardet–Biedl syndrome, but mutations in several genes have been implicated.

Diagnosis

Diagnosis of Laurence–Moon syndrome is based on clinical evaluation and the presence of characteristic symptoms. Genetic testing can confirm the diagnosis by identifying mutations in the associated genes. Early diagnosis is crucial for managing the symptoms and improving the quality of life for affected individuals.

Management

There is no cure for Laurence–Moon syndrome, and treatment is primarily supportive and symptomatic. Management strategies may include:

• Regular ophthalmologic evaluations to monitor and manage vision loss.
• Hormone replacement therapy for hypogonadism.
• Physical therapy and mobility aids for spastic paraplegia.
• Educational support and interventions for intellectual disability.
• Nutritional counseling and weight management programs to address obesity.

Related Conditions

Laurence–Moon syndrome is closely related to Bardet–Biedl syndrome, and the two conditions share many overlapping features. However, Laurence–Moon syndrome is distinguished by the presence of spastic paraplegia and the absence of polydactyly, which is commonly seen in Bardet–Biedl syndrome.

See Also

• Bardet–Biedl syndrome
• Retinitis pigmentosa
• Hypogonadism
• Intellectual disability
• Spastic paraplegia
• Obesity

External Links

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