Prevalence of childhood wheeze and modified DNA methylation at 7 years of age according to maternal folate levels during pregnancy in the Hokkaido Study. Issue 3 (15th December 2020)

• Record Type: Journal Article
• Authors: Miyashita, Chihiro; Araki, Atsuko; Miura, Ryu; Ait Bamai, Yu; Kobayashi, Sumitaka; Itoh, Sachiko; Ito, Kumiko; Tsai, Meng‐Shan; Kishi, Reiko
• Editors: Kalaycı, Ömer
• Is Part Of: Pediatric allergy and immunology. Volume 32:Issue 3(2021)
• Page Start: 514
• Page End: 523
• Publication Date: 2020-12-15
• Subjects: asthma -- birth cohort -- case‐control -- childhood wheeze -- DNA methylation -- folate acid -- maternal folate -- pregnancy; Allergy in children -- Periodicals; Immunologic diseases in children -- Periodicals; 617
• DOI: 10.1111/pai.13425
• Languages: English
• ISSNs: 0905-6157

Abstract

Abstract: Background: A high dose of folic acid during pregnancy may increase the risk of asthma, wheezing, and respiratory disease in childhood. Folate acid can modify inflammation and immune susceptibility of offspring with some epigenetic differentiation, including DNA methylation. This study evaluated associations between maternal folate levels during pregnancy and childhood wheezing; furthermore, the study assessed whether maternal folate‐modified DNA methylation is related to asthma. Methods Participants in the current study were 6651 mother‐child pairs who had complete data on characteristics and who had completed at least one of the International Study of Asthma and Allergies in Childhood questionnaires when the child was 1, 2, 4, and 7 years of age. Moreover, a case‐control study to assess DNA methylation at 7 years of age was conducted among 136 children who experienced wheezing and a control group of 139 children with no history of allergies. Results The median of maternal serum was 16.76 nmol/L, assayed by chemiluminescent immunoassay. We found significantly increased adjusted odds ratios of childhood wheezing at 2 years age according to maternal folate levels, compared with the lowest folate quartile (odds ratio [95% confidence interval] = highest; 1.27 [1.03, 1.56], and second, 1.27 [1.05, 1.55]); however, no changes were observed at 1, 4, and 7 years of age. In a case‐control study, no association of maternal folate levels with DNA methylation was observed. Conclusion Our results suggest that maternal folate did not affect persistent wheezing in school‐aged children, or DNA methylation of gasdermin B, orosomucoid‐like 3, and Ikaros family zinc finger 3 at 7 years of age.