Frequency of NOD2/CARD15 variants in both sporadic and familial cases of Crohn's disease across Italy. An Italian Group for Inflammatory Bowel Disease Study.
BACKGROUND
Three variants of the NOD2/CARD15 gene are strongly associated with susceptibility to Crohn's disease; however, striking racial and geographic differences of their frequency have been described.


OBJECTIVE
We have compared the allele frequencies of familial cases of Crohn's disease recruited in a multicentre study across Italy, in order to disclose possible geographic heterogeneity. Moreover, we also compared the allele frequencies in sporadic cases of Crohn's disease and healthy controls from Southern Italy with those reported in other two populations from Central and Northern Italy.


METHODS
A total of 731 subjects were genotyped for the polymorphism of three main variants (R702W, G908R and 1007 fs): 152 patients were familial cases of Crohn's disease, 183 were healthy first-degree relatives, 180 were sporadic cases of Crohn's disease, and 216 were unrelated healthy subjects.


RESULTS
The frequency of the frameshift mutation (1007 fs) was significantly higher in both familial and sporadic cases of Crohn's disease (P = 0.000001), and healthy first-degree relatives (P = 0.0001) compared to controls. At least one risk allele was found in 44% of familial Crohn's disease patients, compared to 7% of healthy controls (OR = 4; CI = 2-6.5). Two risk alleles were found in 14% of familial Crohn's disease, compared to less than 1% of controls (OR = 26: CI = 4-129).


CONCLUSIONS
Our data confirm the strong correlation between the 1007 fs variant and Crohn's disease, in both familial and sporadic cases. Moreover, no significant difference of allele frequencies was detected in familial cases, sporadic cases and healthy controls among different geographic areas of Italy.
Department of General and Specialist Medicine, Unit of Gastroenterology, CSS-IRCCS Hospital, Viale Cappuccini, 1,71013 San Giovanni Rotondo, Italy. vito.annese@tin.it
V
V
Annese
O
O
Palmieri
A
A
Latiano
S
S
Ardizzone
F
F
Castiglione
M
M
Cottone
R
R
D'Incà
P
P
Gionchetti
C
C
Papi
G
G
Riegler
M
M
Vecchi
A
A
Andriulli
D000328:Adult; D000368:Aged; D002352:Carrier Proteins / Q000235:genetics*; D003424:Crohn Disease / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D016368:Frameshift Mutation; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D007558:Italy; D008297:Male; D008875:Middle Aged; D053473:Nod2 Signaling Adaptor Protein; D011110:Polymorphism, Genetic
D002352:Carrier Proteins; D047908:Intracellular Signaling Peptides and Proteins; C429018:NOD2 protein, human; D053473:Nod2 Signaling Adaptor Protein