Variable PARK2 Mutations Cause Early-Onset Parkinson's Disease in a Small Restricted Population

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• Early-onset Parkinson's disease (EOPD) is a rare form of PD, often with a genetic basis.
• Autosomal recessive (AR) Parkinson's disease (PD) can be caused by mutations in several genes.

Purpose of the Study:

• To identify the genetic causes of EOPD in consanguineous or geographically isolated Israeli families.
• To investigate the role of the PARK2 gene in AR PD.

Main Methods:

• Homozygous mapping using SNP arrays in six EOPD families.
• Sanger sequencing of candidate genes, including PARK2, and analysis of large deletions/duplications in PD-associated genes.

Main Results:

• PARK2 gene mutations (c.996C>A, c.101delA, exon 4 deletion) were identified in four of six families with EOPD.
• Mutations were found in homozygous or compound heterozygous states, confirming AR inheritance.
• PARK2 mutations were implicated in both early-onset and late-onset PD within the same family.

Conclusions:

• Mutations in the PARK2 gene are a frequent cause of autosomal recessive EOPD in the studied population.
• Genetic testing for the PARK2 gene is recommended for suspected AR PD cases.