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Infantile Neuroaxonal Dystrophy is a rare, severe, inherited neurological disorder that causes the progressive degeneration of nerve axons (the long projections of nerve cells). This degeneration leads to severe neurological and physical decline.
read more about infantile neuroaxonal dystrophy ...The cause is a mutation in the PLA2G6 gene. This gene provides instructions for making a protein involved in the metabolism of fats and phospholipids. The mutation causes defects in the metabolism of these fats, leading to the abnormal buildup of spheroid structures (axonal swellings) in the nerve cells.
This toxic accumulation occurs at the terminal ends of the axons, disrupting communication between nerve cells and causing the nervous system to degenerate rapidly. The disorder is relentlessly progressive and severely life-limiting, indicating widespread damage to the central nervous system.
Symptoms typically begin between 6 months and 3 years of age, often following a brief period of normal development. The initial signs include delayed motor skills and the progressive loss of muscle tone (hypotonia), causing the infant to appear floppy. This progresses to difficulty feeding, and later, developmental regression.
The child progressively loses the ability to walk, sit, and speak, requiring constant medical and physical support. The loss of previously acquired milestones is a key, devastating feature of the disorder.
Infantile Neuroaxonal Dystrophy severely impacts vision due to neurological damage. Patients often develop nystagmus (uncontrolled eye movements) and severe optic atrophy (damage and loss of nerve fibers in the optic nerve). This leads to progressive vision loss and eventual blindness.
The long-term consequences are severe neurological and physical decline, leading to loss of all motor skills and communication. The disorder is relentlessly progressive and severely shortens the lifespan.
Genetic counseling is a necessary part of management. Counseling helps parents understand the disorder's inheritance pattern and the prognosis. It provides support for family planning and helps connect families with necessary resources and support groups.
No, Infantile Neuroaxonal Dystrophy is a rare, fatal, progressive genetic disorder with no cure.
Symptoms typically begin in infancy, after 6 months of age.
Yes, the child progressively loses milestones they have already achieved.
If your infant starts losing motor skills or shows a loss of eye contact, see a pediatric neurologist. INAD causes "Optic Atrophy", the death of the optic nerve, leading to progressive blindness. Genetic testing for the "PLA2G6" gene can confirm the medical diagnosis.
NINDS. INAD Information (ninds.nih.gov). 2024.
AAO. Optic Atrophy in Genetic Disease (aao.org). 2024.
NORD. Infantile Neuroaxonal Dystrophy (rarediseases.org). 2024.
StatPearls. Neuroaxonal Dystrophies (ncbi.nlm.nih.gov). 2024.