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The study involved a hospital visit that included a physical examination of the child and their parents, the administration of questionnaires, and the collection of biological samples. BFour samples failed Boston Children’s Hospital Research Computing QC due to one sex mismatch or issues with familial relatedness analysis (i.e. two individuals were determined to have wrong family relationship statuses, and one additional child sample was removed due to subsequent unavailability of parent information). Flowchart of saliva DNA sample selection and case/control family member inclusion in the study.

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The canonical Wnt/β-catenin pathway, along with the sonic hedgehog and noncanonical WNT/planar cell polarity pathways, are critical in directing cell differentiation and convergent extension of the neural plate during neural tube closure (Wolujewicz & Ross, 2019). A study by Li et al. (Li et al., 2021) observed that LHPP overexpression inhibits the proliferation and invasion of glioblastoma cells and downregulates the activity of Wnt/β-catenin signaling. A study by Métais et al. (Métais et al., 2018) using Asb2 knockout embryos demonstrated that the absence of Asb2a, an isoform of Asb2, can lead to embryonic mortality in mice as a result of heart defects. Genotype frequencies for the significant variants from the trio transmission disequilibrium test model. Visualization of significant single nucleotide polymorphisms from GWAS analysis was done using Manhattan plots (qqman (Turner, 2018) package in R). The effect of amino acid substitutions in the significant variants from the models was predicted using the PolyPhen-2 Web tool (Adzhubei et al., 2013), with a potential prediction outcome of probably damaging, possibly damaging, or benign.

Genetic Association Analyses

Previous work in Bangladesh in a large pregnancy cohort has shown high correlations between pregnant women’s toenail arsenic measurements during the first trimester and 1 month post-partum and also with measurements from their infant’s toenails at age 1 month . We were not able to assess all pregnancies that included neural tube defects because Bangladesh does not have a birth defect surveillance program that collects this information from ultrasonography centers or from all deliveries. We used biomarkers (e.g. toenail arsenic) to minimize this bias. If arsenic exposure was related to these more severe outcomes, our results could represent a downward bias towards or beyond the null . It is possible that even higher arsenic exposures are needed to demonstrate a primary effect. In Folbp2 knockout mice, for example, mice with this specific defect in folate transport had higher rates of NTDs after arsenic exposure, and mice nullizygous for genes encoding proteins in cellular uptake of folate were more susceptible to arsenic-induced NTDs .

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A subset of individuals from the case-control study had saliva DNA of sufficient quality and were included in the genetic analyses (Figure 1). Control children were excluded from the main study if the child was diagnosed with cancer or a condition considered to be related to arsenic exposure (i.e. arsenic-related keratosis). Various candidate gene studies of neural tube defects in humans have examined one or a few genes (Finnell et al., 2021), particularly those that are orthologs of risk genes in mice or genes involved in folate pathways (Greene & Copp, 2014). Determinants of https://wakelet.com/@spinracasinoen neural tube defects include a combination of environmental, nutritional, and genetic risk factors (Greene & Copp, 2014; Harris & Juriloff, 2007). At minimum, more surveillance for spina bifida is needed in high arsenic areas such as Bangladesh.

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Trained study staff interviewed patients’ families to collect demographic characteristics, patient and family medical histories, referral patterns to NINS&H, and medical histories. No exclusions were made based on genetics, geography, or family history. A recent analysis estimated that globally, at least 213,800 − 322,000 pregnancies are affected by NTDs each year, and in low-income and middle-income countries, the prevalence of NTDs exceeds one in every 100 births . Spina bifida is a type of neural tube defect (NTD), a group of disorders caused by failure of the neural tube to fuse in the third week of gestation .

Associated Data

We found similar evidence of effect modification when we restricted the analysis to cases with myelomeningocele, a more severe type of spina bifida. The cutoff for mother’s toenail arsenic concentrations was defined by the median of study population (0.46 µg/g toenail). Serum folate concentrations were higher among mothers who reported folic acid use during pregnancy compared to those who did not report folic acid use (10.20 ng/ml and 7.96 ng/ml, respectively).

All three progress rings, bonus rounds, and cashout options work the same as on desktop, with clear touch controls and instant loading. An additional limitation of the study involved the inclusion of children with lipomeningocele, another type of neural tube defect, and their families in the control group. Our study complements the recent trend of gene discovery analysis in neural tube defect research promoted by advances in cutting-edge next-generation sequencing technologies. Manhattan plot of the family-based association analysis (transmission disequilibrium test) results for the trios. This was similarly observed in the model comparing mothers of cases and controls (Figure S2). Next, models including 1) mothers-only or 2) children-only were assessed with standard association (–assoc) one degree of freedom chi-square allelic tests to identify significant variants.

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Additional preventive measures, such as folic acid fortification of the food supply and reduction of arsenic exposure, may be needed to optimize spina bifida prevention in areas with high arsenic exposures. Another possible explanation for why we did not find a primary effect of arsenic is that arsenic exposure by itself may be insufficient, and that the addition of other risk factors, such as inadequate folate, is a necessary contribution to disrupt neural tube closure. These studies suggest that prenatal folic acid supplementation may be less effective in spina bifida prevention in populations with high arsenic exposure because of interactions between arsenic and folic acid. Our results are consistent with recent studies conducted in high arsenic areas that suggest that environmental arsenic exposure may attenuate the protective benefit of folic acid supplements in preventing spina bifida. There was no significant main effect found between water and mother’s toenail arsenic concentrations and spina bifida risk (Supplemental Table 3). Thirteen mothers reported a diagnosis of diabetes, including mothers of 9 cases and 4 controls.

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