
FAMILY HISTORY AS AN IMPORTANT FACTOR
FOR STRATIFYING PARTICIPANTS IN GENETIC
STUDIES OF MAJOR DEPRESSION Zalar B, Blatnik A, Maver A, Klemenc-Ketiš Z, Peterlin B *Corresponding Author: Professor Borut Peterlin, Clinical Institute of Medical Genetics, Division of Obstetrics and Gynecology,
University Medical Center Ljubljana, Šlajmerjeva 3, 1000 Ljubljana, Slovenia. Tel: +386-1-5401-137. E-mail:
borut.peterlin@guest.arnes.si page: 5
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RESULTS
Genotype distributions for tested SNPs in control
samples adhered to the Hardy-Weinberg equilibrium. No
significant difference in distribution was detected when
comparing the MDD cases and healthy controls for any of
the variants tested. There were no significant differences
using the dominant, recessive or codominant model (data
not shown). Genotype and allele distributions for the three
tested variants in 133 patients with MDD and 279 healthy
controls are shown in Table 1.
A comparison of the genotype and allele frequency
distributions was also performed between the group of
MDD patients with a positive family history for depression
and patients with no such family history. A significant
difference in genotype and allele frequencies was
detected between the two groups of patients for the PCLO
rs2522833 polymorphism. The association remained significant
even after correction for multiple testing; no other
association reached the threshold of statistical significance.
Both patients with a positive family history and those with
a negative family history were also compared to healthy
controls. A significant difference in the allele and genotype
frequencies was detected between the familial cases and
controls, again for the PCLO rs2522833 polymorphism.
The results are shown in Table 2.
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