Adenylosuccinate Lyase Deficiency (ASLD)

Neurology

Adenylosuccinate lyase deficiency (ASLD), also known as adenylosuccinase deficiency, is a rare inherited metabolic disorder.

It is a neurological disorder that causes brain dysfunction leading to delayed development of intellectual and motor abilities, autistic behaviours affecting communication and social interaction, and seizures. It is caused by mutations in the ADSL gene, leading to a deficiency of the enzyme adenylosuccinate lyase.

This enzyme is involved in the purine nucleotide cycle, which is essential for the synthesis and degradation of purine nucleotides important for various cellular functions.

In ASLD, adenylosuccinate lyase deficiency disrupts the normal metabolism of purine nucleotides, leading to accumulation of toxic substances and deficiency of essential molecules.

Symptoms can vary greatly, but typically include intellectual disability, developmental delay, seizures, hypotonia (poor muscle tone) and autistic features. Other possible symptoms may include movement disorders, behavioural abnormalities and growth delays.

It is typically diagnosed through genetic testing to identify mutations in the ADSL gene. Treatment options are limited and management primarily focuses on supportive care, including seizure management, physical and occupational therapies, and addressing associated symptoms.

As it is a complex condition, a medical professional or geneticist should be consulted for detailed information, accurate diagnosis and personalised management options based on the individual case.

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FAQ

Is adenylosuccinate lyase deficiency hereditary?

Yes, adenylosuccinate lyase deficiency is an inherited disorder. It follows an autosomal recessive inheritance pattern, meaning that an affected individual inherits two copies of the mutated ADSL gene, one from each parent.

What are adenylosuccinate lyase deficiency symptoms?

Intellectual disability
Developmental delay
Seizures
Hypotonia (reduced muscle tone)
Autistic features
Movement disorders
Behavioral and psychiatric issues
Growth delays

What is ADSL diagnosis?

The diagnosis typically involves a combination of clinical assessment, biochemical tests and genetic testing.

How do you treat adenylosuccinate deficiency?

Treatment focuses on managing symptoms and providing supportive care. This includes seizure management, physical and occupational therapy, speech therapy, behavioral and educational interventions, medications targeting specific symptoms, and nutritional support. The treatment plan aims to improve patient’s quality of life.

What causes adenylosuccinase deficiency?

ASLD is caused by mutations in the ADSL gene. These gene mutations lead to a deficiency or absence of the enzyme adenylosuccinate lyase, disrupting the purine nucleotide cycle. Itis inherited in an autosomal recessive manner and requires an individual to inherit two copies of the mutated gene. Genetic testing is used to confirm the diagnosis and identify specific mutations.

What is adenylosuccinate lyase deficiency prognosis?

The prognosis for adenylosuccinate lyase deficiency can vary depending on the individual and the severity of their symptoms. It is a progressive disease and symptoms usually worsen over time. However, early diagnosis and appropriate management can help improve quality of life and potentially slow disease progression. Ongoing medical care and support from a multidisciplinary team is important for individuals.

 

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