(A) LRRK2 mRNA expression in DCs from patients with CD. (B) LRRK2 mRNA expression in LCLs from individuals with genotype G/G or G/A at SNP rs11564258 [a nonrisk allele (G) and a risk allele (A)]. (C) LRRK2 protein relative to β-actin in CD patients with the same genotypes as in (B). (A and B) LRRK2 mRNA was measured by real-time polymerase chain reaction (PCR). (C) LRRK2 protein relative to β-actin was measured by Western blotting (fig. S1). (A) G/G genotype, n = 13; G/A genotype, n = 7, P = 0.0104; (B) G/G genotype, n = 9; G/A genotype, n = 9, P = 0.04; (C) G/G genotype, n = 9; G/A genotype, n = 9, P = 0.0098. (D) Lrrk2 Tg mice and littermate control mice were fed 2% DSS for 8 days, and body weight was measured. The data represent the average value for each group. n = 12 Lrrk2 Tg mice (Lrrk2 Tg) and n = 14 control mice (day 10, P = 0.0283; day 11, P = 0.0186). (E) Histological score of colon inflammation for Lrrk2 Tg and control mouse groups analyzed in (C). n = 12 Lrrk2 Tg mice and n = 14 control mice (P = 0.0054). Asterisk (*) indicates P < 0.05. (F) Representative photomicrographs of hematoxylin and eosin (H&E)–stained colon tissue on day 11 from Lrrk2 Tg mice and littermate controls. Data are presented as means ± SEM. Statistical significance was determined using an unpaired two-tailed Student’s t test.