Folate intake, markers of folate status and oral clefts: An updated set of systematic reviews and meta-analyses - PubMed (original) (raw)
Meta-Analysis
. 2020 Nov;112(19):1699-1719.
doi: 10.1002/bdr2.1827. Epub 2020 Oct 29.
Affiliations
- PMID: 33118705
- DOI: 10.1002/bdr2.1827
Meta-Analysis
Folate intake, markers of folate status and oral clefts: An updated set of systematic reviews and meta-analyses
Yulai Zhou et al. Birth Defects Res. 2020 Nov.
Abstract
Background: There has been a longstanding debate about the role of folate in the etiology of orofacial clefts (OFCs). Studies of different measures of nutritional intake or folate status have been done to investigate the possible role of folate in the prevention of OFC. Only one knowledge synthesis has attempted to bring together different types of evidence. The aim of the present work was to update it.
Methods: Evidence for associations between OFC and dietary folate, supplement use, folic acid fortification, biomarkers of folate status, and variants of MTHFR (C677T and A1298C) were included. Potentially eligible articles were systematically identified from PubMed, Medline, Embase, and Web of Science (2007-2020) and combined using random-effects meta-analysis when appropriate. Quality assessments were conducted using the Newcastle-Ottawa scale and Cochrane's risk of bias tool.
Results: Sixty-four studies published since the previous knowledge synthesis were identified, with eight of these identified through a supplementary search from October, 2018 to August, 2020. There was an inverse association between folic acid-containing supplement use before or during pregnancy and cleft lip with or without cleft palate (CL/P) (OR 0.60, 95% CI 0.51-0.69), with considerable between-study heterogeneity. The prevalence of CL/P showed a small decline post-folic acid fortification in seven studies (OR 0.94, 95% CI 0.86-1.02). No association was found between OFC and genetic markers of folate status. The coronavirus-19 pandemic has threatened food availability globally and therefore there is a need to maintain and even enhance surveillance concerning maternal intake of folate and related vitamins.
Conclusions: The risk of non-syndromic OFC was reduced among pregnant women with folic acid-containing supplements during the etiologically relevant period. However, high heterogeneity between included studies, incomplete reporting of population characteristics and variation in timing of exposure and supplement types mean that conclusions should be drawn with caution.
Keywords: MTHFR; folate intake; folic acid fortification; multivitamin supplements; non-syndromic clefts.
© 2020 Wiley Periodicals LLC.
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