S149R, a novel mutation in the ABCD1 gene causing X-linked adrenoleukodystrophy

Area of Science:

• Genetics
• Biochemistry
• Neurology

Background:

• X-linked adrenoleukodystrophy (X-ALD) is the most common peroxisomal disorder.
• It results from mutations in the ATP-binding cassette protein subfamily D1 (ABCD1) gene.
• ABCD1 encodes the peroxisomal membrane protein ALDP, crucial for very long-chain fatty acid transport.

Purpose of the Study:

• To report the first case of olivopontocerebellar X-ALD in mainland China.
• To identify and characterize a novel mutation in the ABCD1 gene in a patient with X-ALD.

Main Methods:

• Genetic sequencing to detect ABCD1 gene mutations.
• Bioinformatics analysis to predict the mutation's impact.
• Immunofluorescence to assess protein localization and function.

Main Results:

• A novel ABCD1 mutation (c.447T>A; p.S149R) was identified in the patient.
• The mutation is predicted to be deleterious, altering protein structure and subcellular localization.
• Altered ALDP localization suggests impaired very long-chain fatty acid degradation in peroxisomes.

Conclusions:

• The novel ABCD1 mutation (p.S149R) is identified as pathogenic for X-ALD.
• This mutation affects ALDP structure, localization, and function, leading to disease.
• This case expands the understanding of X-ALD phenotypes and genetic variations in the Chinese population.