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МЕДИЧН1ПЕРСПЕКТИВИ / MEDICNIPERSPEKTIVI
UDC 616-021.5.-074:575.22:577.112]-053.2
https://doi.Org/10.26641/2307-0404.2019.3.181882
V.O. Dytiatkovsky 1,
ASSOCIATIONS OF GENOTYPE VARIANTS OF SINGLE NUCLEOTIDE POLYMORPHISM OF GENE OROSOMUCOID-1-LIKE-PROTEIN 3 AND ATOPIC DISEASES IN CHILDREN
O.E. Abaturov 1, N.V. Naumenko 2, N.L. Pinayeva 2, O.O. Alifirenko 2
2
SE «Dnipropetrovsk medical academy of Health Ministry of Ukraine» 1 Department of Pediatrics 1 and Medical Genetics V. Vernadsky str., 9, Dnipro, 49044, Ukraine
MI "Dnipro clinical association of emergency medicine" Allergy Centre 2
Shmidta str., 26, Dnipro, 49006, Ukraine
ДЗ «Днтропетровська медична академiя МОЗ Украти»1
кафедра nediampii 1 та медично'1 генетики
(зав. - д. мед. н., проф. О.С. Абатуров)
вул В. Вернадського, 9, Днтро, Укра'та
Алергологiчний центр КЗ «ДКОШМДДМР» 2
вул. Шмiдта, 26, Днтро, 49006, Украша
e-mail: ditiatkovskyvo@gmail.com
Цитування: Медичт перспективы. 2019. Т. 24, № 3. С. 67-73 Cited: Medicniperspektivi. 2019;24(3):67-73
Key words: atopic diseases, children, genotype, associations, orsomucoid-1-like protein 3
Ключовi слова: amoni4Hi захворювання, dimu, генотипи, асощацп, орсомукоiд-1-подiбнй бшок 3
Ключевые слова: атопические заболевания, дети, генотипы, ассоциации, орсомукоид-1-подобный белок 3
Abstract. Associations of genotype variants of single nucleotide polymorphism of gene orosomucoid-1-like-protein 3 and atopic diseases at children. Dytiatkovsky V.O., Abaturov O.E., Naumenko N.V., Pinayeva N.L., Alifirenko O.O.
The paper presents data of the firstly conducted in Ukraine own study of associations of the single nucleotide polymorphism (SNP) rs7216389 of orsomucoid-1-like protein 3 gene (ORMDL3) variants' with atopic diseases in children. Aim: to detect clinical significance of the SNP rs7216389 ORMDL3 in genesis of atopic diseases in children. We examined 153 children aged 3 to 18 years. The main group consisted of 119 children with clinical manifestations of atopic diseases with elevated total serum immunoglobulin E, confirmed by immunofluorescence assay method. The comparison group consisted of 34 children with a non-aggravated individual or family allergic anamnesis in whom there was detected the absence of any clinical syndromes and symptoms of atopic diseases and, mostly, physiological parameters of the serum total immunoglobulin E by immunofluorescence assay method. All the children were genotyped by ORMDL3 gene using polymerase chain reaction in real time with a restricted fragment length polymorphism. The genotype T/T within SNP rs7216389 of ORMDL3 gene significantly prevails among the children with atopic diseases and is associated with an increased incidence risk of seasonal allergic rhinoconjunctivitis (SARC) by 4.11 times (95% CI 1.55; 16.61), perennial allergic rhinitis (PAR) by 5.07 times (95% CI 1.22; 13.90) times and bronchial asthma (BA) by 10.31 times (95% CI 2.50; 42.62). Children with genotype T/T in locus rs7216389 of the ORMDL3 gene are the increased risk group for developing the atopic diseases. Children with genotype C/C in locus rs7216389 of the ORMDL3 gene are the decreased risk group for the development of atopic dermatitis.
Реферат. Асощацп генотипових вар1ам |1в однонуклеотидного полiморфiзму гена орсомукоiд-1-подiбмого бшка 3 типу та атошчних захворювань д^ей. Дитятковський В.О., Абатуров О.С., Науменко Н.В., Шнаева Н.Л., Алiфiренко О.О. У статтi наведет дат вперше проведеного в УкраМ власного дослiдження асоцiацiй однонуклеотидного полiморфiзму (SNP) rs7216389 гена орсомукоiд-1-подiбного быка 3 (ORMDL3) з атопiчними захворюваннями в дтей. Мета: визначити клтчне значення SNP rs7216389 гена ORMDL3 в розвитку атопiчних захворювань у дтей. Нами обстежено 153 дитини вком вiд 3 до 18 роюв. Основну групу представили 119 дiтей з клiнiчними проявами атопiчних захворювань та пiдвищеним рiвнем загального сиро-ваткового iмуноглобулiну Е, пiдтвердженим методом iмунофлюоресцетного аналiзу. Групу порiвняння склали 34 дитини з необтяженим iндивiдуальним чи амейним алергологiчним анамнезом, у яких була визначена вiд-сутнiсть будь-яких клЫчних синдромiв та симптомiв атопiчних захворювань. Уам дтям проведено гено-типування гена ORMDL3 методом полiмеразноi ланцюгово'1' реакци в реальному час з рестриктивним фрагментом довжини полiморфiзму. Генотип Т/Т SNP rs7216389 гена ORMDL3 достовiрно переважае серед дiтей з атотчними захворюваннями та асоцшований з пiдвищеним ризиком захворюваностi на сезонний
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алергiчний ринокон'юктивт у 4,11 раза (95% Д1 1.55; 16.61), цiлорiчний алергiчний ринт у 5,07раза (95% Д1 1.22; 13.90) та 6poHximbHy астму в 10,31 раза (95% Д1 2.50; 42.62). Дти з генотипом T/T SNP rs7216389 гена ORMDL3 е групою пiдвищеного ризику розвитку атопiчних захворювань.
In the world as a whole, and in Ukraine, in particular, there is being observed an increase inci-denced of the atopic diseases'(AtD) in childhood. Thus, according to data of the Ministry of Health of Ukraine, during 2009-2014 there is a gradual increase in the incidence of atopic dermatitis (AD) among children aged 0 to 18 years [1], which in turn is the first step of the so-called atopic march (AM) -a linear transformation of AD into seasonal allergic rhinoconjunctivitis (SARC), perennial allergic rhinitis (CAR) and bronchial asthma (BA).
Single nucleotide polymorphisms (SNP) of genes involved in the pathogenesis of allergic inflammation have a primary significance among all the genetic factors of various AtD progression in children.
One of the central genes involved in the pathogenesis of AtD, namely, bronchial asthma (BA), is the ORMDL3 gene (orsomucoid-1-like protein 3 gene) that controls the synthesis of orosomucoid-1-like protein 3 or sphingolipid regulator of biosynthesis 3.
The ORMDL3 gene with a total length of 6560 bps includes three exons and encodes a protein of 153 amino acids with four probable transmembrane domains that are fixed onto the endoplasmic reticulum [2, 11]. The ORMDL3 gene is located in the chromosome 17q21 and belongs to the new ORM gene family, which plays an important role in the negative regulation of the sphingnolipid homeo-stasis which were studied on the example of Saccharomyces cerevisae yeast and helped Breslow et al. to establish an increased incline to pediatric asthma [10]. Region 17q21, which contains ORMDL3 gene is specifically associated with the risk of pediatric BA [8].
Recently, it has been found that ORMDL3 protein changes the endoplasmic reticulum mediated by Ca2+-gomeostasis and facilitates up the deployed protein response that is considered to be an endogenous inflammatory inductor [12].
In a study by L. Akhabir et al. [3], it was demonstrated the strongest association of SNP's ORMDL3 gene with the risk of pediatric BA. Authors confirmed the hypothesis on the role of region 17q21 genes, particularly the ORMDL3 gene in the onset of BA. In a study by J.G. Ono et al. [9] it was pointed at direct association of SNP ORMDL3 with the pathogenesis of bronchial hyper-responsiveness, which reveals new diagnostic possibilities for BA.
According to the the meta-analysis results conducted by H Wu et al. [6], large-scale genome-wide association (GWAS) studies [2, 11] T allele of
ORMDL3 gene is associated with an increased risk of BA, especially in childhood [7]. In the H. Shi et al. meta-analysis [5] by the "case-control" model, the results of the study of 6462 patients with BA and 7357 controls in the control group were published. This analysis of age subgroups pointed at a statistically significant association of the risk of BA development in children with SNP rs7216389 of the ORMDL3 gene.
The above studies enabled us to assume the decisive role of SNP rs7216389 in the ORMDL3 gene in the pathogenesis of AM. To confirm the chosen hypothesis, we conducted studying variants of SNP rs7216389 of ORMDL3 gene in children suffering from AM nosologies. The lack of data on the role of SNP rs7216389 in the ORMDL3 gene for Ukraine proves the reasonability of studying this SNP on local pediatric cohorts.
MATERIALS AND METHODS OF RESEARCH
We studied 119 children of the main group with AtD and 34 children of the comparison group aged from 3 to 18 years old. The study of children of the main group was conducted at the Department of Pediatrics 1 and Medical Genetics of the SE "Dni-propetrovsk Medical Academy of Health Ministry of Ukraine", based at MI "Dnipro City Clinical Hospital N 1 of the Dnipro City Council" and the pediatric department of the Allergy Center "Dnipro Clinical Association of Emergency Care Medicine of the Dnipro City Council". The study of the comparison group children was conducted at premises of the Department of pediatric gastroenterology of the MI "Dnipro Municipal Clinical Hospital N 1 of the Dnipro City Council". For each patient in the study group there was obtained an informed voluntary consent from the children's parents or their legal representatives for diagnostic intervention by means of the buccal swab from the oral cavity mucosa.
The inclusion criteria in the main group were: established diagnosis of AD, SARC, PAR and BA. The exclusion criteria were: not elevated total serum IgE level. Children from the comparison group were included in the study in the absence of a clinical picture of AtD at examination time, as well as without aggravated individual or family allergic history. The nosology structure of the comparison group included digestive system diseases (functional dyspepsia, gastroesophageal reflux disease, chronic gastritis, chronic gastroduodenitis, stomach and duodenal ulcer, functional disorders of the biliary system).
All the children with AtD passed through a clinical examination using standardized diagnostic tools (SCORAD Index, asthma control test (ACT)). Atopy was confirmed by elevated levels of general and/or specific serum IgE to causative allergens revealed by the immunofluorescence assay in the certified laboratory of "Diagnostic Center of Medical Academy Pharmacies" Ltd.
All the patients were genotyped using standardized rs7216389 TaqMan® assays by means of real time polymerase chain reaction with a restricted fragment length polymorphism (Real Time PCR-RFLP). The genotyping was carried out on the Applied Biosystems 7500 Fast Real Time PCR
System [4] in a certified laboratory of the Department of General and Molecular Pathophysiology of the O.O. Bohomolets Institute of Physiology of the National Academy of Sciences of Ukraine.
The statistical analysis was performed using the Statistica v.6.1 package (Statsoft Inc., USA, license # AGAR909E415822FA) and sensitive criteria: Fischer's exact test (FET), validated by the reliability p-test at the level of p <0.05 and the odds ratio (OR) with a 95 % confidence interval (CI).
RESULTS AND DISCUSSION
Incidence of definite AtD nosologies among the main group children is presented on figure 1.
BA
PAR
......I1""11""
: 16,0%
lllllllll 40,3%
SARC
■47,9%:
AD
43,7%
0,0% 10,0% 20,0% 30,0% 40,0% 50,0% 60,0%
Fig. 1. Incidence of definite AtD in the main group
The frequency structure of different ORMDL3 gene SNP rs7216389 genotypes among children of the main and comparison groups, presented in Table 1, indicates the significant prevalence of T/T genotype in children with AtD.
It is obviuos from Table 1 that the reliable risk of AtD onset or progression equals to 3.8 with 95% CI (1.24; 11.63) given T/T genotype of SNP rs7216389 ORMDL3 gene.
Atopic dermatitis.
The frequency of the studied genotypes in children with AD in the main group and in com-
parison group evidences of a statistically significant prevalence of the C/C genotype SNP rs7216389 of ORMDL3 gene among the children of comparison group (tab.2). Odds ratios for AD within different genotypes variants of the studied gene are shown. The risk of developing AD within genotype C/C SNP rs7216389 ORMDL3 gene is significantly low and equals to 0.23 with 95% CI (0.06; 0.84) in the carriers. The T/T genotype's OR for AD is 2.76 with 95 % CI (0.81; 9.38), however, these data are not statistically significant (tab. 2)
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Table 1
Comparative characteristics of different genotypes of SNP rs7216389 ORMDL3 gene frequency in children of the main and comparison group
Groups and statistic criteria Genotypes of SNP rs7216389 ORMDL3 gene
С/С С/Т T/T
Main group 10.1% 56.3% 33.6%
Comparison group 26.5% 61.8% 11.8%
Pearson Chi-square, p-level p<0.05 p>0.05 p<0.05
Fisher exact, two-tailed, p-level p<0.05 p>0.05 p<0.05
Spearman Rank R, p-level p<0.05 p>0.05 p<0.05
Odds ratio (OR) 0.31 0.80 3.8
-95%; +95% CI 0.12; 0.83 0.36; 1.75 1.24; 11.63
Seasonal allergic rhinoconjunctivitis
carried by the genotype T/T SNP rs7216389
The data on SNP rs7216389 genotypes of the ORMDL3 gene, which was detected in 40.4% of
ORMDL3 gene in children of the main group with children and equaled to 5.07. The C/C and C/T ge-
SARC and comparison evidences that the highest notypes are not significantly associated with the risk
statistically significant risk of SARC incidence is of developing SARC among the carriers (tab. 3).
Table 2
Comparative characteristics of different genotypes of SNP rs7216389 ORMDL3 gene frequency in children of the main group with AD and comparison group
Groups and statistic criteria Genotypes of SNP rs7216389 ORMDL3 gene
C/C С/Т T/T
Main group 7.7% 65.4% 26.9%
Comparison group 26.5% 61.8% 11.8%
FET, p-level p<0.05 p>0.05 p>0.05
Odds ratio (OR) 0.23 1.17 2.76
-95%; +95% CI 0.06; 0.84 0.47; 2.91 0.81; 9.38
Table 3
Comparative characteristics of different genotypes of SNP rs7216389 ORMDL3 gene frequency in children of the main group with SARC and comparison group
Groups and statistic criteria Genotypes of SNP rs7216389 ORMDL3 gene
C/C C/T T/T
Main group 14.0% 45.6% 40.4%
Comparison group 26.5% 61.8% 11.8%
FET, p-level p>0.05 p>0.05 p<0.05
Odds ratio (OR) 0.45 0.52 5.07
-95%; +95% CI 0.15; 1.34 0.22; 1.25 1.55; 16.61
Perennial allergic rhinitis
The frequency of different genotypes of SNP rs7216389 of ORMDL3 gene in children with PAR collated with the comparison group shows that C/C genotype SNP rs7216389 of ORMDL3 gene is found to be significantly more seldom in PAR patients,
compared to genotype T/T, including the comparison group. The true OR for PAR incidence among carriers of T/T genotype SNP rs7216389 of ORMDL3 gene is 4.11 times higher with 95% CI (1.22; 13.9) compared to those with the genotype C/C SNP rs7216389 of ORMDL3 gene (tab. 4).
Table 4
Comparative characteristics of different genotypes of SNP rs7216389 ORMDL3 gene frequency in children of the main group with PAR and comparison group
Groups and statistic criteria Genotypes of SNP rs7216389 ORMDL3 gene
C/C C/T T/T
Main group 8.3% 56.3% 35.4%
Comparison group 26.5% 61.8% 11.8%
FET, p-level p<0.05 p>0.05 p<0.05
Odds ratio (OR) 0.25 0.80 4.11
-95%; +95% CI 0.07; 0.92 0.32; 1.96 1.22; 13.90
Bronchial asthma suffering from BA collated to comparison group
The frequency of genotypes SNP rs7216389 of shows the significant prevalence of the T/T variant ORMDL3 gene in children of the main group, SNP rs7216389 of ORMDL3 gene in children
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suffering from BA compared to a group of children without AtD (tab.5). The T/T genotype variant of SNP rs7216389 of ORMDL3 gene results in significantly 10.31 fold higher risk of developing BA in the carriers with 95% CI (2.50; 42.62) compared to those possessing C/C and C/T genotype variants (tab. 5).
We detected the mostly incident nosologies in children of the main group: AD, SARC and PAR. In
the framework of this study, for the first time in Ukraine we detected the frequency of C and T alleles of SNP rs7216389 of ORMDL3 gene in children with AtD. For the first time in Ukrainian pediatric groups, there was defined the frequency of carrying the C/C, C/T and T/T diploid alleles of SNP rs7216389 of ORMDL3 gene in AD, SARC, PAR and BA as well as in diseases of the digestive system.
Table 5
Comparative characteristics of different genotypes of SNP rs7216389 ORMDL3 gene frequency in children of the main group with BA and comparison group
Groups and statistic criteria Genotypes of SNP rs7216389 ORMDL3 gene
C/C С/Т T/T
Main group 5.3% 36.8% 57.9%
Comparison group 26.5% 61.8% 11.8%
FET, p-level p>0.05 p>0.05 p<0.05
Odds ratio (OR) 0.15 0.36 10.31
-95%; +95% CI 0.02; 1.4 0.11; 1.19 2.50; 42.62
Analysis of the data obtained allows us to state the opposite biological effects of the C/C and T/T genotypes of SNP rs7216389 of ORMDL3 gene. Thus, the T/T variant was significantly more common in children with AtD than in children of comparison group with GIT pathology: in SARC and PAR - more than 3 times, in BA - almost 5 times. On the contrary, the C/C variant was detected 3 times less than in children with pathology of the GIT.
The above findings made it possible to establish a homozygous T/T variant as mostly associated with a significantly increased risk of AtD in general, as well as of its definite nosologies: SARC, PAR and BA - at 5.7, 4.11 and 10.31 fold, respectively.
At the same time, we determined that the C/C genotype of SNP rs7216389 of ORMDL3 gene had an opposite biological effect - the carriers face a significantly low OR - 0.23- for developing the AD and potential transformation into BA. ORMDL3 gene SNP rs7216389 variant C/T did not reveal
significant associations with AtD in children. The latest finding indicates the need for further studies on larger pediatric groups to obtain statistically significant results for the C/T variant as either a marker or a protector for the incline to AtD at children.
CONCLUSIONS
1. The T/T genotype of SNP rs7216389 of ORMDL3 gene in children is significantly associated with AtD, such as SARC, PAR and BA. The risk (OR) for SARC, PAR and BA in children with the T/T genotype of SNP rs7216389 of ORMDL3 gene equals to 5.07, 4.11 and 10.31 respectively. The C/C genotype SNP rs7216389 of ORMDL3 gene has a statistically significant association with the decreased risk of AtD incidence.
2. The T/T genotype of SNP rs7216389 of ORMDL3 gene can be used as the novel laboratory marker for genetic predisposition to both BA and other AtD progression at children.
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МЕДИЧН1ПЕРСПЕКТИВИ / MEDICNIPERSPEKTIVI
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Стаття надшшла до редакцп 01.07.2019
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