
ASSOCIATION OF THE ACE rs4646994 AND rs4341
POLYMORPHISMS WITH THE PROGRESSION
OF CAROTID ATHEROSCLEROSIS IN SLOVENIAN
PATIENTS WITH TYPE 2 DIABETES MELLITUS Merlo S1, Novák J2,3,4, Tkáčová N2, Nikolajević Starčević J5, Šantl Letonja M6, Makuc J7,
Cokan Vujkovac A7, Letonja J5, Bregar D5, Zorc M5, Rojko M5, Mankoč S5, Kruzliak P8, Petrovič D5 *Corresponding Author: Professor Daniel Petrovič, M.D., Ph.D., Institute of Histology and Embryology, Faculty
of Medicine University Ljubljana, Korytkova 2, SI-1000 Ljubljana, Slovenia. Tel: +386-1-543-7367. Fax: +386-1-
543-7361. E-mail: daniel.petrovic@mf.uni-lj.si page: 37
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RESULTS
Patients with T2DM had a greater waist circumference,
higher fasting glucose and Hb A1c levels
compared to controls, whereas there were no statistically
significant differences in age, body mass index
(BMI), and systolic and diastolic blood pressure
between patients with T2DM and control subjects
(Table 1). Patients with T2DM had lower total, high
density lipoprotein (HDL) and low density lipoprotein
(LDL) cholesterol levels and higher triglyceride
levels compared to controls (Table 1). Plasma levels
of inflammatory markers (i.e., high sensitive C-reactive
protein (hs-CRP) were statistically significantly
higher in patients with T2DM compared to controls
(Table 1).
The genotype distributions both in patients with
T2DM and controls were in the Hardy-Weinberg
equilibrium for both ACE gene polymorphisms [rs4646994: T2DM (genotype frequencies: II genotype
21.5%, ID genotype 46.4%, DD genotype 32.1%;
χ2 = 2.27; p = 0.13) and controls (genotype frequencies:
II genotype 24.0%, ID genotype 49.0%, DD
genotype 27.0%; χ2 = 0.07; p = 0.78); rs4341: T2DM
(genotype frequencies: GG genotype 28.1%, GC genotype
52.1%, CC genotype 19.8%; χ2 = 1.44; p = 0.23)
and controls (genotype frequencies: GG genotype
23.5%, GC genotype 54.5%, CC genotype 22.0%;
χ2 = 1.63; p = 0.20)]. No statistically significant differences
in the ACE rs4646994 and rs4341 genotype
distribution frequencies were observed between the
T2DM patients and controls. Moreover, in our study,
linkage disequilibrium between the two selected single
nucleotide polymorphisms (SNPs) (rs4646994 and
rs4341) was confirmed (d’ =0.98 r2=0.82).
Several parameters of carotid atherosclerosis,
such as CIMT, number of involved segments, and
sum of plaque thicknesses, were evaluated with regard
to different genotypes of both ACE polymorphisms
in subjects with T2DM at enrollment and
after 3.8 years (Table 2). Moreover, the parameters
of progression of atherosclerosis, i.e., annual increase
in CIMT, change in number of segments with plaques
and change in the sum of carotid plaque thicknesses,
were analyzed with univariate and multiple linear
regression analyses (Tables 3 and 4). With regard to
the progression of atherosclerosis in subjects with
T2DM, statistically significant differences were
demonstrated in the change of the sum of carotid
plaque thickness for the rs4646994 polymorphism
only (Table 3). Finally, according to the results of
multiple linear regression analysis, faster progression
of atherosclerosis was demonstrated in subjects with
T2DM with the DD genotype of the rs 4646994 (ACE
I/D) polymorphism in comparison with subjects with
other genotypes (Table 4).
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