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Interaction between antibiotic use and MS4A2 gene polymorphism on childhood eczema: a prospective birth cohort study

BMC Pediatrics volume 21, Article number: 314 (2021) Cite this article

Abstract

Background

Eczema is usually the first allergic manifestation to appear in life attributed to gene–environment interactions. IL13, IL4, MS4A2 and ILR4A are four key inflammatory genes associated with atopy. This study aimed to explore gene-environment interactions on eczema in early life among the above four genes and environmental factors in Chinese Han children.

Methods

Five hundred ninety-seven children from a birth cohort who completed two-year follow-up were enrolled and their cord blood was collected. Subjects were genotyped for six polymorphisms in the aforementioned four genes. The children were followed at 6, 12 and 24 months, with epidemiologic information and medical history of eczema collected by questionnaire and eczema assessed by dermatologists.

Results

Among the 597 children, 168 were diagnosed with eczema and the others were not after 2 years of follow-up. MS4A2 rs569108 GG genotype (P = 1.68E-02, odds ratio (OR) = 4.66) and antibiotic use (P = 3.75E-4, OR = 2.02) were found independently associated with development of childhood eczema. Children with both antibiotic use and MS4A2 rs569108 GG genotype were more likely to develop eczema than those with only antibiotic use or GG homozygote (OR = 6.24 VS. 2.04 or 4.68).

Conclusions

MS4A2 rs569108 polymorphism and antibiotic use were solely associated with eczema, and they interacted with each other to increase the risk of developing the disease in Chinese Han toddlers. Long-term follow-up along with functional and replication studies are still needed.

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Introduction

Eczema, also known as atopic dermatitis, is a common inflammatory skin disease beginning in early life with increasing incidence in many countries around the world [1, 2]. The high prevalence of eczema is believed to be a result of gene-environment interactions [3, 4], which has aroused extensive research interest and led to increasing studies on the risk and protective factors of the disease.

Allergic diseases have long been attributed to IgE-mediated inflammatory reactions [5] and eczema is usually the first allergic manifestation to appear in life [6]. In this study, we focused on four key inflammatory genes affecting IgE levels, including IL13, IL4, MS4A2 and ILR4A, which have been associated with atopy [7,8,9,10,11,12], and replicated in more than ten different studies [13]. We attempted to explore gene-environment interactions on eczema in early life among the aforementioned four genes and environmental factors in a birth cohort with a two-year follow-up in Chinese Han population.

Methods

Study design and participants

A birth cohort study was carried out at two large tertiary hospitals in Shanghai from 2012 to 2015. One thousand fifty-six women who had a singleton pregnancy and planned to live in Shanghai for at least 2 years were recruited. Trained research nurses conducted face-to-face interviews to collect parental information on atopy, education levels and family income. Newborn’s birth information from hospital records along with umbilical cord blood were collected at birth by research nurses. Then the children were followed up for 2 years and their medical history of eczema and epidemiologic information were collected by questionnaire. Five hundred ninety-seven Chinese Han children who completed the 2 years of follow-up were included in this study. Written informed consent was obtained from parents and / or legal guardians for all the subjects who are under 16. This study was approved by the Ethics Committees of the two participating hospitals, Xinhua Hospital and the International Peace Maternity & Child Health Hospital, and conducted according to the principles in the Declaration of Helsinki.

Questionnaire survey and assessment of eczema

Each study subject was followed up at 6 months, 1 year and 2 years of age. At six-month follow-up, an internet-based questionnaire survey was conducted to collect children’s history of eczema via the standardized International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire, which had been validated and adapted in China [14, 15]. Information on antibiotic use and environmental exposures, including home pet sitting, secondhand smoke exposure and home decoration was also collected. At one-year and two-year follow-up visits, face-to-face questionnaire interviews were conducted to collect similar information as that at six-month follow-up.

The diagnostic criteria for eczema were: itchy rash on the flexural sites (the folds of the elbows, behind the knees or in front of the ankles), face, or around the neck or ears, and itchy rash coming and going for at least 6 months, based on the UK working party’s diagnostic criteria [16]. Two dermatologists diagnosed eczema independently for all the subjects based on the questionnaires, with disagreements resolved by consensus.

Candidate genes and single nucleotide polymorphisms

This study focused on four candidate genes, including IL13, IL4, MS4A2 and IL4RA, which are key inflammatory genes associated with IgE levels [7,8,9,10,11,12]. Within these genes, six known functional single-nucleotide polymorphisms (SNPs) with minor allele frequency greater than 10% based on Chinese population [17] were chosen for analysis, as shown in Table 1.

Table 1 Candidate genes and SNPs analyzed in this study
Full size table

Genotyping

Genomic DNA was obtained from umbilical cord blood with the QIAamp DNA Blood Mini Kit (Qiagen, Hilden, Germany). SNP genotyping was performed using matrix-assisted laser desorption / ionization time of flight mass spectrometry (MALDI-TOF MS) [18] (MassArray iPLEX; Sequenom, San Diego, CA, USA). Genotyping call rate for each SNP exceeded 99%. 5% of the samples were blindly retested and concordance rate for duplicate genotyping was greater than 98%.

Statistical analysis

Associations of epidemiologic factors with eczema were assessed by multivariate logistic regression adjusting for potential confounders. Each SNP was tested for Hardy–Weinberg equilibrium in the study subjects with the χ2 test, and associations of the SNPs with eczema were also evaluated using multivariate logistic regression. Gene - environment interaction on eczema was examined by χ2 tests. A two-tailed P value of 0.05 or less was considered statistically significant. All analyses were performed using SPSS version 17.0 (IBM Corp., Armonk, NY, USA).

Results

Associations of epidemiologic factors with eczema

Among the 597 children, 168 were diagnosed with eczema after 2 years of follow-up while the others were not. Characteristics of the study subjects were presented in Table 2. Antibiotic use was found significantly associated with development of childhood eczema after adjusting for multiple child and parental characteristics (P = 3.75E-4, odds ratio (OR) = 2.02). However, baby’s gender, gestational age, birth weight, delivery mode, parity, home pet sitting, in-home secondhand smoke exposure, home decoration, family income, parental atopy and education level were not found associated with eczema by multivariate logistic regression (P > 0.05).

Table 2 Associations of epidemiologic factors with eczema
Full size table

Associations of candidate genes with eczema

All the SNPs met Hardy-Weinberg equilibrium criteria (p > 0.05). The genetic models (additive, dominant and recessive models) were tested for the SNPs. Among the six SNPs, only MS4A2 rs569108 was found associated with childhood eczema (P < 0.05), and its most significant association with the disease was under additive model. Association test results under additive model were shown in Table 3. MS4A2 rs569108 GG genotype was found significantly associated with eczema (P = 1.68E-02, OR = 4.66). No significant associations were found between the other five SNPs and eczema (P > 0.05).

Table 3 Associations of candidate genes with eczema
Full size table

Interaction between antibiotic use and MS4A2 rs569108 on eczema

Table 4 shows that children with both antibiotic use and MS4A2 rs569108 GG genotype were more likely to develop eczema than those without antibiotic use and GG homozygote (P = 1.49E-02, OR = 6.24), and also more likely to develop eczema than those with only antibiotic use or GG genotype (OR = 6.24 VS. 2.04 or 4.68).

Table 4 Interaction between antibiotic use and MS4A2 rs569108 on eczema
Full size table

Discussion

In this study, MS4A2 rs569108 GG genotype and antibiotic use were found solely associated with eczema in early life, and they interacted with each other to enhance the risk of developing the disease. This is the first report of gene-environment interactions between rs569108 and antibiotic use on childhood eczema.

Our study is the first to report an independent association of MS4A2 rs569108 GG homozygote with eczema in two-year-old children. This polymorphism has been reported significantly associated with histamine release from basophils [19], which may induce atopic eczema [20]. Our study also confirmed the independent effect of antibiotic use on risk of childhood eczema, consistent with previous reports [21,22,23,24]. Early life exposure to antibiotics may have adverse effects on the neonatal gut microbiome and adversely affect the development of the infant immune system, leading to childhood atopic diseases [25]. How the polymorphism in the MS4A2 gene interacts with antibiotic exposure in early life to increase risk of eczema remains unknown. Future studies are needed to investigate the biological interactions between them.

There are some limitations in this research. First, only 597 children completed two-year follow-up in this study, which had a small sample size and a short follow-up duration. Larger sample size and long-term follow-up are needed in future. Second, only four genes (i.e. IL13, IL4, MS4A2 and IL4RA) were chosen as candidate genes. However, the four genes are susceptible genes of atopy [7,8,9,10,11,12] replicated in more than ten different populations [13]. In our further study, more genes and SNPs associated with atopy and eczema should be included. Third, environmental exposures were evaluated by self-reported questionnaire, which may underestimate the associations of certain environmental exposures. Direct measurement of certain environmental exposures is needed in future. Fourth, assessment of eczema was based on parental-reported symptoms in this birth cohort study. 28.14% (168/597) of the subjects developed eczema, and the prevalence data was similar with that reported in another study [26]. Fifth, replications of the findings in other populations are needed in future studies.

Conclusions

This study suggests that MS4A2 rs569108 polymorphism and antibiotic use were independently associated with eczema, and they interacted with each other to increase the risk of developing the disease in Chinese Han toddlers, which still need long-term follow-up along with functional and replication studies.

Availability of data and materials

The datasets generated and analyzed during the current study are not publicly available due to ethical concerns, but are available from the corresponding authors on reasonable request.

Abbreviations

SNPs:

Single-nucleotide polymorphisms

OR:

Odds ratio

rs:

Reference SNP

CI:

Confidence interval

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Acknowledgements

We would like to thank all the participants and their parents.

Funding

This study was funded by the Youth Program of National Nature Science Foundation of China (No. 81900018), the Project for Innovation Teams in Local High Level Universities in Shanghai, and the State Key Program of National Nature Science Foundation of China (No. 81530086). The funding body had no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.

Author information

Authors and Affiliations

  1. Department of Pediatric Pulmonology, Xin Hua Hospital, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, China

    Li Hua, Quan-Hua Liu, Jian-Hua Zhang, Li-Wei Wang & Ruo-Xu Ji

  2. Ministry of Education-Shanghai Key Laboratory of Children’s Environmental Health, Xin Hua Hospital, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, China

    Qian Chen & Jun Zhang

  3. Department of Dermatology, Xin Hua Hospital, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, China

    Yi-Feng Guo & Ru-Hong Cheng

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  1. Li Hua
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Contributions

LH, JHZ and JZ conceived and designed the study. QC and QHL collected and processed the specimens. LH, LWW and QHL did the measurement of the specimens. LH, QHL, QC, YFG and RHC sorted out the questionnaire data. LH, RXJ and QHL conducted the statistical analysis. LH drafted the manuscript. RXJ, LWW and JHZ reviewed and edited the manuscript. All authors read and approved the manuscript.

Corresponding authors

Correspondence to Li-Wei Wang or Ruo-Xu Ji.

Ethics declarations

Ethics approval and consent to participate

Written informed consent was obtained from parents and / or legal guardians for all the subjects who are under 16. This study was approved by the Ethics Committees of the two participating hospitals, Xinhua Hospital and the International Peace Maternity & Child Health Hospital (approval number: XHEC-C-2012-003), and conducted according to the principles in the Declaration of Helsinki.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Hua, L., Chen, Q., Liu, QH. et al. Interaction between antibiotic use and MS4A2 gene polymorphism on childhood eczema: a prospective birth cohort study. BMC Pediatr 21, 314 (2021). https://doi.org/10.1186/s12887-021-02786-x

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Keywords

BMC Pediatrics

ISSN: 1471-2431

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