The methods for collecting dot blood samples on filter paper cards,
(Devost and Choy, 2000) PCR amplification of GBA genomic DNA for sequence
analysis using GBA specific primers, and RFLP analysis of GBA
mutations are described in Supplementary information. In order to con-
firm that mutations G355R/R359X were in cis arrangement i.e. present
in the same allele, exon 8 was cloned into the sequencing vector
pJET1.2. One Shot TOP10® chemically competent E. coli (Life Technologies,
Carlsbad, CA) was transformed with pJET1.2/exon 8 and
transformants were selected for on low sodium LB agar containing
100 μg/mL ampicillin. Colony PCR was performed on 24 clones, 15 of
which contained the exon 8 insert and were sequenced analyzed by
Europhins MWG Operon.