[Relationship between polymorphism of non-coding regions of human mitochondrial genome and primary cardiac conduction disorders].
OBJECTIVE
Analysis of associations between idiopathic disturbances of cardiac conduction (DCC) and polymorphism of mitochondrial genome.


METHODS
A family examination was performed in 431 probands with various DCC and 1347 relatives of the first, second and third degree of kinship (the study group). All the examinees were divided into four subgroups. These included 158 probands with atrioventricular block (AVB) of various degree and their 518 relatives (subgroup 1); 50 probands with a complete right bundle-branch block (BBB) and their 161 relatives (subgroup 2); 108 probands with a complete left BBB and left anterior branch of the His bundle and their 152 relatives (subgroup 3); 115 probands with sick sinus syndrome (SSS) and their 327 relatives (subgroup 4). The control group consisted of 104 probands without clinical ECG manifestations of cardiac diseases and their 321 relatives. All the examinees have undergone ECG, atropin test, echocardioscopy, electrophysiological examination of the heart and mitochondrial DNA (mDNA).


RESULTS
Comparison of the incidence of mDNA D-loop restriction sites in the group of patients with idiopathic DCC and controls has found higher frequency of the Hae III 16517 site in the group of the patients (p = 0.0480). By location of the blocks (atrioventricular and intraventricular), the site occurred more frequently in patients with AVB (86.36%). The variant "+" by the site of Hae III 16517 mDNA was found to associate with disturbances of cardiac conduction, more closely in AVB.


CONCLUSIONS
Variability of mDNA may be an etiological factor of idiopathic DCC pathogenesis.
Nikulina
S Iu
SIu
Shul'man
V A
VA
Vorotnikova
Iu V
IuV
Puzyrev
V P
VP
Kosiankova
T V
TV
Golubenko
M V
MV
D004272:DNA, Mitochondrial / Q000235:genetics*; D004452:Echocardiography; D004562:Electrocardiography; D020022:Genetic Predisposition to Disease; D016678:Genome; D006327:Heart Block / Q000235:genetics*; D006801:Humans; D008214:Lymphocytes / Q000378:metabolism; D007703:Peptidyl-Dipeptidase A / Q000235:genetics; D012150:Polymorphism, Restriction Fragment Length
D004272:DNA, Mitochondrial; D007703:Peptidyl-Dipeptidase A