Congenital axonal neuropathy and encephalopathy

Area of Science:

• Neurology
• Genetics
• Pathology

Background:

• Congenital axonal neuropathy with encephalopathy is exceptionally rare, with limited documented cases.
• This study investigates seven patients over 25 years with this condition.

Purpose of the Study:

• To describe the clinical and pathological features of congenital axonal neuropathy with encephalopathy.
• To identify potential novel molecular or pathological markers for this rare disorder.

Main Methods:

• Sural nerve biopsies were performed to analyze nerve fiber morphology.
• Clinical data, including neurological and developmental assessments, were collected.
• Western-blot analysis was used to examine protein expression in brain tissue from one patient.

Main Results:

• Nerve biopsies showed axonal atrophy and loss of large-diameter nerve fibers.
• Patients presented with neonatal hypotonia, distal weakness, areflexia, microcephaly, seizures, and developmental delay.
• A significant decrease in microtubule-associated protein 1A and 2 was observed in the brain of the most recent patient, alongside calloso-splenial hypogenesis and neurofilament swellings.

Conclusions:

• Congenital axonal neuropathy with encephalopathy has a poor prognosis, with high mortality in early childhood.
• The observed deficiency in central nervous system microtubule-associated proteins may indicate a novel clinicopathologic entity.
• Further research is needed to confirm the role of microtubule-associated proteins in this condition.