Andermann syndrome Overview Andermann syndrome, also known as ACCPN, is a rare, severe neurodegenerative genetic disorder. It primarily features the underdevelopment or absence of the tissue connecting the two halves of the brain (corpus callosum), along with progressive muscle weakness and intellectual disability. Symptoms A Neurological Complications Progressive Neuropathy : Early muscle weakness (hypotonia) transitions into progressive motor deterioration, causing severe muscle wasting (amyotrophy) and flaccid tetraplegia. Affected individuals usually lose the ability to walk and become wheelchair-bound by adolescence. Cranial Nerve Defects: Damage to cranial nerves can cause facial muscle weakness, drooping eyelids (ptosis), and gaze palsy (difficulty moving the eyes in certain directions). Seizures: Epilepsy and abnormal electrical activity in the brain occur in many patients.Sensory Loss: Patients suffer from absent or severely diminished sensory responses (areflexia...
Arginine: Glycine Amidinotransferase Deficiency Overview Arginine: glycine amidinotransferase deficiency (AGAT) is one of the three cerebral creatine deficiency syndromes (CCDS). These conditions are inborn errors of creatine metabolism which interrupt the formation or transport of creatine. Creatine is necessary to use properly adenosine triphosphate (ATP), which provides energy to all cells in the body. Symptoms The severity of AGAT varies from patient to patient. People with AGAT typically present with mild to moderate intellectual disabilities, delayed speech and may have seizure activity. Some individuals may develop autistic like behaviors. Children with AGAT may not gain weight and grow at the expected rate (failure to thrive) and have delayed development of motor skills such as sitting and walking. Affected individuals may also have weak muscle tone and tend to tire easily. Causes AGAT is the first step of creatine production, resulting in the formation of guanidinoacetate, the...