Infantile neuroaxonal dystrophy and PLA2G6-associated neurodegeneration: An update for the diagnosis

Area of Science:

• Neuroscience
• Genetics
• Pediatric Neurology

Background:

• Infantile neuroaxonal dystrophy (INAD) is a rare, severe neurodegenerative disorder presenting in infancy.
• It is characterized by rapid motor and cognitive decline, hypotonia, and progressing spasticity.
• Recessive mutations in the PLA2G6 gene are the primary cause, encompassing a spectrum of related neurodegenerative conditions.

Purpose of the Study:

• To review current clinical and neuroradiological findings for infantile neuroaxonal dystrophy.
• To facilitate differential diagnosis of INAD from other pediatric neurodegenerative disorders.
• To highlight the diagnostic challenges posed by phenotypic heterogeneity and limited genotype-phenotype correlations.

Main Methods:

• Review of recent clinical data.
• Analysis of neuroradiological information.
• Comparative analysis with other pediatric neurodegenerative conditions.

Main Results:

• PLA2G6 gene mutations are linked to INAD and related disorders like Karak syndrome.
• The phenotypic spectrum of PLA2G6-associated neurodegeneration is broad and evolving.
• Overlapping clinical features and heterogeneity complicate straightforward diagnosis.

Conclusions:

• Accurate diagnosis of INAD is challenging due to overlapping symptoms and genetic complexity.
• Understanding subtle clinical and radiological signs is crucial for timely diagnosis and genetic testing.
• Further research is needed to refine genotype-phenotype correlations and improve diagnostic strategies.