The impact of COVID-19 on psychiatric clinical encounters among low-income racially-diverse children

BACKGROUND

There is a lack of longitudinal data to examine the impact of COVID-19 on all types of clinical encounters among United States, underrepresented BIPOC (Black, Indigenous, and people of color), children. This study aims to examine the changes in all the outpatient clinical encounters during the pandemic compared to the baseline, with particular attention to psychiatric encounters and diagnoses.

METHOD

This study analyzed 3-year (January 2019 to December 2021) longitudinal clinical encounter data from 3,394 children in the Boston Birth Cohort, a US urban, predominantly low-income, Black and Hispanic children. Outcomes of interest were completed outpatient clinical encounters and their modalities (telemedicine vs. in person), including psychiatric care and diagnoses, primary care, emergency department (ED), and developmental and behavioral pediatrics (DBP).

RESULTS

The study children's mean (SD) age is 13.9 (4.0) years. Compared to 2019, psychiatric encounters increased by 38% in 2020, most notably for diagnoses of adjustment disorders, depression, and post-traumatic stress disorders (PTSD). In contrast, primary care encounters decreased by 33%, ED encounters decreased by 55%, and DBP care decreased by 16% in 2020. Telemedicine was utilized the most for psychiatric and DBP encounters and the least for primary care encounters in 2020. A remarkable change in 2021 was the return of primary care encounters to the 2019 level, but psychiatric encounters fluctuated with spikes in COVID-19 case numbers.

CONCLUSIONS

Among this sample of US BIPOC children, compared to the 2019 baseline, psychiatric encounters increased by 38% during 2020, most notably for the new diagnoses of adjustment disorder, depression, and PTSD. The 2021 data showed a full recovery of primary care encounters to the baseline level but psychiatric encounters remained sensitive to the pandemic spikes. The long-term impact of the pandemic on children's mental health warrants further investigation.

Posttraumatic Stress Symptoms and the Quality of Maternal-Child Interactions in Mothers of Preterm Infants

OBJECTIVE

The purpose of this study was to examine associations between maternal trauma exposure, posttraumatic stress symptoms, and directly observed maternal-child interactions among a diverse cohort of mother-preterm infant dyads at 12-month corrected age.

METHODS

We conducted a retrospective cohort study. Maternal trauma exposure and posttraumatic stress symptoms were measured using the Modified Posttraumatic Stress Disorder Symptom Scale at baseline and 6 and 12 months. The primary outcome was directly observed maternal-child interactions at 12-month corrected age using the Coding Interactive Behavior Manual. We used linear regression models to estimate the associations between trauma exposure, posttraumatic stress symptoms (and symptom clusters), and observer-rated maternal-child interactions.

RESULTS

Among the 236 participants, 89 (37.7%) self-reported as Black and 98 (41.5%) as Latina; mean gestational age of the infants was 31.6 weeks (SD 2.6). Mothers with posttraumatic stress symptoms demonstrated greater maternal sensitivity (β = 0.32; 95% confidence interval [CI], 0.06-0.58; standardized effect size = 0.39) and greater dyadic reciprocity (β = 0.39; 95% CI, 0.04-0.73; standardized effect size = 0.36) compared with those not exposed to trauma; however, we did not observe significant differences between trauma-exposed but asymptomatic women and those not exposed to trauma. Across symptom clusters, differences in maternal sensitivity and dyadic reciprocity were most pronounced for mothers with avoidance and re-experiencing symptoms, but not hyperarousal symptoms.

CONCLUSION

Maternal posttraumatic stress symptoms seem to be associated with the quality of maternal-child interactions at age 1 year among a cohort of urban, mother-preterm infant dyads. These findings have implications for strength-based intervention development.

Small Moments, Big Impact: Pilot Trial of a Relational Health App for Primary Care

OBJECTIVE

To conduct a pilot trial of Small Moments, Big Impact: a relational health app.

METHODS

Low-income mothers with 1 or no prior children, a full-term birth, above 18 years old, and without substance abuse were recruited. The control group was recruited prior to the intervention group to avoid contamination. Of the 117 mothers enrolled, 29 intervention and 29 control mothers completed the study. Five questionnaires were administered at baseline and 6-months to measure maternal depression, empathy, beliefs about children's emotions, intelligence mindsets, and app use. At 6 months, questionnaires assessing parenting stress, reflective functioning, and perceived value of app were also administered.

RESULTS

Mothers in the final sample were similar to those who did not complete the study, except more mothers who dropped out were recruited during COVID-19 and had a lower empathetic subscale score. No differences were found between groups at pre- or post-test. However, because of skewed outcome variables which violated normality principles and the small sample size, quantile regression analyses were performed comparing the 25th, 50th, and 75th percentiles for each outcome. Controlling for pretest and potential confounders, subsets of SMBI mothers reported lower parental stress, more growth mindset and increased effort to understand their child's feelings. Ninety percent of mothers reported using SMBI at least once per week. Eighty percent of mothers would recommend the SMBI app to new mothers.

CONCLUSIONS

Most mothers used SMBI weekly, rated it highly and reported less stress, more growth mindset, and more positive child rearing beliefs.

Association between cord blood metabolites in tryptophan pathway and childhood risk of autism spectrum disorder and attention-deficit hyperactivity disorder

Alterations in tryptophan and serotonin have been implicated in various mental disorders; but studies are limited on child neurodevelopmental disabilities such as autism spectrum disorder (ASD) and attention-deficit hyperactivity disorder (ADHD). This prospective cohort study examined the associations between levels of tryptophan and select metabolites (5-methoxytryptophol (5-MTX), 5-hydroxytryptophan (5-HTP), serotonin, N-acetyltrytophan) in cord plasma (collected at birth) and physician-diagnosed ASD, ADHD and other developmental disabilities (DD) in childhood. The study sample (n = 996) derived from the Boston Birth Cohort, which included 326 neurotypical children, 87 ASD, 269 ADHD, and 314 other DD children (mutually exclusive). These participants were enrolled at birth and followed-up prospectively (from October 1, 1998 to June 30, 2018) at the Boston Medical Center. Higher levels of cord 5-MTX was associated with a lower risk of ASD (aOR: 0.56, 95% CI: 0.41, 0.77) and ADHD (aOR: 0.79, 95% CI: 0.65, 0.96) per Z-score increase, after adjusting for potential confounders. Similarly, children with cord 5-MTX ≥ 25th percentile (vs. <25th percentile) had a reduction in ASD (aOR: 0.27, 95% CI: 0.14, 0.49) and ADHD risks (aOR: 0.45, 95% CI: 0.29, 0.70). In contrast, higher levels of cord tryptophan, 5-HTP and N-acetyltryptophan were associated with higher risk of ADHD, with aOR: 1.25, 95% CI: 1.03, 1.51; aOR: 1.32, 95% CI: 1.08, 1.61; and aOR: 1.27, 95% CI: 1.05, 1.53, respectively, but not with ASD and other DD. Cord serotonin was not associated with ASD, ADHD, and other DD. Most findings remained statistically significant in the sensitivity and subgroup analyses.

Association of mitochondrial DNA content, heteroplasmies and inter-generational transmission with autism

Mitochondria are essential for brain development. While previous studies linked dysfunctional mitochondria with autism spectrum disorder (ASD), the role of the mitochondrial genome (mtDNA) in ASD risk is largely unexplored. This study investigates the association of mtDNA heteroplasmies (co-existence of mutated and unmutated mtDNA) and content with ASD, as well as its inter-generational transmission and sex differences among two independent samples: a family-based study (n = 1,938 families with parents, probands and sibling controls) and a prospective birth cohort (n = 997 mother-child pairs). In both samples, predicted pathogenic (PP) heteroplasmies in children are associated with ASD risk (Meta-OR = 1.56, P = 0.00068). Inter-generational transmission of mtDNA reveals attenuated effects of purifying selection on maternal heteroplasmies in children with ASD relative to controls, particularly among males. Among children with ASD and PP heteroplasmies, increased mtDNA content shows benefits for cognition, communication, and behaviors (P ≤ 0.02). These results underscore the value of exploring maternal and newborn mtDNA in ASD.

Most genetic studies of autism spectrum disorder (ASD) have focused on the nuclear genome. Here, the authors show that variations in mitochondrial DNA, detectable at birth, are also associated with risk of ASD.

Maternal Stress and Early Neurodevelopment: Exploring the Protective Role of Maternal Growth Mindset

OBJECTIVE

The purpose of this study was to test associations between maternal stress, maternal mindset, and infant neurodevelopment at 12 months of age. Specifically, we sought to examine the extent to which maternal growth mindsets may serve to attenuate the negative associations between maternal stress and infants' neurodevelopment.

METHODS

The current exploratory study leverages data from a longitudinal cohort study following mother-infant dyads. Maternal-perceived stress, maternal mindset, and infant electroencephalography (EEG) recordings were collected when infants were 12 months of age. The final analytic sample included 33 dyads.

RESULTS

Results revealed no statistically significant main effects of maternal stress or maternal mindset for any of the infant EEG frequency band outcomes. After including interactions between maternal stress and mindset, statistically significant positive interactions were detected for all EEG frequency bands. Simple slope tests revealed significant negative associations between maternal stress and each of the 6 EEG frequency bands for mothers with more fixed-oriented mindsets. Associations between maternal stress and infant EEG outcomes for mothers with more growth-oriented mindsets did not differ from 0.

CONCLUSION

These findings suggest that infants raised by mothers with growth mindsets may be protected against the neurodevelopmental consequences of higher maternal stress.

Effects of Stress and Nativity on Maternal Antenatal Substance Use and Postnatal Mental Disorders

Background: Maternal substance use and common mental disorders (CMDs) during or after pregnancy can lead to negative health outcomes among mothers and infants. We examined whether nativity (US-born versus foreign-born) and stress levels during pregnancy were associated with antenatal substance use and postnatal CMDs. Methods: We analyzed the Boston Birth Cohort, a racially diverse cohort recruited at birth with rolling enrollment since 1998. Information on antenatal substance use (tobacco and/or alcohol use) was obtained using an in-person postpartum questionnaire (n = 6,514). Information on postnatal CMDs (depression and/or anxiety) was obtained from medical records (n = 2,052). Nativity and stress during pregnancy were self-reported. We performed multivariate logistic regression to examine how nativity and stress levels were jointly associated with antenatal substance use and postnatal CMDs. We further investigated if blacks, Hispanics, and whites were differentially at risk. Results: We found that US-born mothers were at higher risk of substance use and CMDs than their foreign-born counterparts. In analyses combining nativity and stress, being US-born with high stress was associated with increased odds of antenatal substance use (adjusted odds ratio [aOR] = 14.91, 95% confidence interval [CI]: 12.09-18.39) and postnatal CMDs (aOR = 4.09, 95% CI: 2.72-6.15) compared with foreign-born mothers with low stress. The results of the subanalyses limited to black and Hispanic women separately were similar; high stress alone was associated with fourfold increased odds of CMDs among foreign-born Hispanic mothers (aOR = 4.27, 95% CI: 1.96-9.33). Conclusions: Findings suggest that identifying and alleviating high stress among pregnant women may reduce their risk of antenatal substance use and postnatal CMDs.

Maternal and cord plasma branched-chain amino acids and child risk of attention-deficit hyperactivity disorder: a prospective birth cohort study

BACKGROUND

Branched-chain amino acids (BCAA: leucine, isoleucine, and valine) are essential amino acids involved in biological functions of brain development and recently linked with autism. However, their role in attention-deficit hyperactivity disorder (ADHD) is not well-studied. We investigated individual and combined relationships of maternal plasma and newborn cord plasma BCAAs with childhood development of ADHD.

METHODS

We utilized the Boston Birth Cohort, a predominantly urban, low-income, US minority population. Child developmental outcomes were defined in three mutually exclusive groups - ADHD, neurotypical (NT), or other developmental disabilities based on physician diagnoses per ICD-9 or 10 in medical records. The final sample included 626 children (299 ADHD, 327 NT) excluding other developmental disabilities. BCAAs were measured by liquid chromatography-tandem mass spectrometry. We used factor analysis to create composite scores of maternal and cord BCAA, which we divided into tertiles. Logistic regressions analyzed relationships between maternal or cord BCAA tertiles with child ADHD risk, controlling for maternal race, age, parity, smoking, education, low birth weight, preterm birth, and child sex. Additionally, we analyzed maternal and cord plasma BCAAs jointly on child ADHD risk.

RESULTS

Adjusted logistic regression found significantly increased odds of child ADHD diagnosis for the second (OR 1.63, 95% CI: 1.04, 2.54, p = .032) and third tertiles (OR 2.01, 95% CI: 1.28, 3.15, p = .002) of cord BCAA scores compared to the first tertile. This finding held for the third tertile when further adjusting for maternal BCAA score. There was no significant association between maternal BCAA score and child ADHD risk, nor a significant interaction between maternal and cord BCAA scores.

CONCLUSIONS

In this prospective US birth cohort, higher cord BCAA levels were associated with a greater risk of developing ADHD in childhood. These results have implications for further research into mechanisms of ADHD development and possible early life screening and interventions.

Genome-wide association study identifies a novel maternal gene × stress interaction associated with spontaneous preterm birth

BACKGROUND

Maternal stress is potentially a modifiable risk factor for spontaneous preterm birth (sPTB). However, epidemiologic findings on the maternal stress-sPTB relationship have been inconsistent.

METHODS

To investigate whether the maternal stress-sPTB associations may be modified by genetic susceptibility, we performed genome-wide gene × stress interaction analyses in 1490 African-American women from the Boston Birth cohort who delivered term (n = 1033) or preterm (n = 457) infants. Genotyping was performed using Illumina HumanOmni 2.5 array. Replication was performed using data from the NICHD genomic and Proteomic Network (GPN) for PTB research.

RESULTS

rs35331017, a T-allele insertion/deletion polymorphism in the protein-tyrosine phosphatase receptor Type D (PTPRD) gene, was the top hit that interacted significantly with maternal lifetime stress on risk of sPTB (P_G × E = 4.7 × 10^-8). We revealed a dose-responsive association between degree of stress and risk of sPTB in mothers carrying the insertion/insertion genotype, but an inverse association was observed in mothers carrying the heterozygous or deletion/deletion genotypes. This interaction was replicated in African-American (P_G × E = 0.088) and Caucasian mothers (P_G × E = 0.023) from the GPN study.

CONCLUSION

We demonstrated a significant maternal PTPRD × stress interaction on sPTB risk. This finding, if further confirmed, may provide new insight into individual susceptibility to stress-induced sPTB.

IMPACT

This was the first preterm study to demonstrate a significant genome-wide gene-stress interaction in African Americans, specifically, PTPRD gene variants can interact with maternal perceived stress to affect risk of spontaneous preterm birth. The PTPRD × maternal stress interaction was demonstrated in African Americans and replicated in both African Americans and Caucasians from the GPN study. Our findings highlight the importance of considering genetic susceptibility in assessing the role of maternal stress on spontaneous preterm birth.

Anti-Poverty Medicine Through Medical-Financial Partnerships: A New Approach to Child Poverty

Poverty threatens child health. In the United States, financial strain, which encompasses income and asset poverty, is common with many complex etiologies. Even relatively successful antipoverty programs and policies fall short of serving all families in need, endangering health. We describe a new approach to address this pervasive health problem: antipoverty medicine. Historically, medicine has viewed poverty as a social problem outside of its scope. Increasingly, health care has addressed poverty's downstream effects, such as food and housing insecurity. However, strong evidence now shows that poverty affects biology, and thus, merits treatment as a medical problem. A new approach uses Medical-Financial Partnerships (MFPs), in which healthcare systems and financial service organizations collaborate to improve health by reducing family financial strain. MFPs help families grow assets by increasing savings, decreasing debt, and improving credit and economic opportunity while building a solid foundation for lifelong financial, physical, and mental health. We review evidence-based approaches to poverty alleviation, including conditional and unconditional cash transfers, savings vehicles, debt relief, credit repair, financial coaching, and employment assistance. We describe current national MFPs and highlight different applications of these evidence-based clinical financial interventions. Current MFP models reveal implementation opportunities and challenges, including time and space constraints, time-sensitive processes, lack of familiarity among patients and communities served, and sustainability in traditional medical settings. We conclude that pediatric health care practices can intervene upon poverty and should consider embracing antipoverty medicine as an essential part of the future of pediatric care.

A prospective cohort study on the intersectionality of obesity, chronic disease, social factors, and incident risk of COVID-19 in US low-income minority middle-age mothers

OBJECTIVE

Coronavirus disease 2019 (COVID-19) has disproportionally affected communities of color. We aimed to determine what factors are associated with COVID-19 testing and test positivity in an underrepresented, understudied, and underreported (U3) population of mothers.

METHODS

This study included 2996 middle-aged mothers of the Boston Birth Cohort (a sample of predominantly urban, low-income, Black and Hispanic mothers) who were enrolled shortly after they gave birth and followed onward at the Boston Medical Center. COVID-19 testing and test positivity were defined by the SARS-CoV-2 nucleic acid test. Two-probit Heckman selection models were performed to identify factors associated with test positivity while accounting for potential selection associated with COVID testing.

RESULTS

The mean (SD) age of study mothers was 41.9 (±7.7) years. In the sample, 1741 (58.1%) and 667 (22.3%) mothers were self-identified as Black and Hispanic, respectively. A total of 396 mothers had COVID-19 testing and of those, 95 mothers tested positive from March 2020 to February 2021. Among a multitude of factors examined, factors associated with the probability of being tested were obesity (RR = 1.27; 95% confidence interval (CI): 1.08-1.49); and presence of preexisting chronic medical conditions including hypertension, asthma, stroke, and other comorbidities (coronary heart disease, chronic kidney disease, and sickle cell disease) with a corresponding RR = 1.40 (95% CI: 1.23-1.60); 1.29 (95% CI: 1.11-1.50); 1.44 (95% CI: 1.23-1.68); and 1.37 (95% CI: 1.12-1.67), respectively. Factors associated with higher incident risk of a positive COVID-19 test were body mass index, birthplace outside of the USA, and being without a college-level education.

CONCLUSIONS

This study demonstrated the intersectionality of obesity and social factors in modulating incident risk of COVID-19 in this sample of US Black and Hispanic middle-aged mothers. Methodologically, our findings underscore the importance of accounting for potential selection bias in COVID-19 testing in order to obtain unbiased estimates of COVID-19 infection.

Postpartum plasma metabolomic profile among women with preeclampsia and preterm delivery: implications for long-term health

BACKGROUND

Preeclampsia and preterm delivery (PTD) are believed to affect women's long-term health including cardiovascular disease (CVD), but the biological underpinnings are largely unknown. We aimed to test whether maternal postpartum metabolomic profiles, especially CVD-related metabolites, varied according to PTD subtypes with and without preeclampsia, in a US urban, low-income multi-ethnic population.

METHODS

This study, from the Boston Birth Cohort, included 980 women with term delivery, 79 with medically indicated PTD (mPTD) and preeclampsia, 52 with mPTD only, and 219 with spontaneous PTD (sPTD). Metabolomic profiling in postpartum plasma was conducted by liquid chromatography-mass spectrometry. Linear regression models were used to assess the associations of each metabolite with mPTD with preeclampsia, mPTD only, and sPTD, respectively, adjusting for pertinent covariates. Weighted gene coexpression network analysis was applied to investigate interconnected metabolites associated with the PTD/preeclampsia subgroups. Bonferroni correction was applied to account for multiple testing.

RESULTS

A total of 380 known metabolites were analyzed. Compared to term controls, women with mPTD and preeclampsia showed a significant increase in 36 metabolites, mainly representing acylcarnitines and multiple classes of lipids (diacylglycerols, triacylglycerols, phosphocholines, and lysophosphocholines), as well as a decrease in 11 metabolites including nucleotides, steroids, and cholesteryl esters (CEs) (P < 1.3 × 10^-4). Alterations of diacylglycerols, triacylglycerols, and CEs in women with mPTD and preeclampsia remained significant when compared to women with mPTD only. In contrast, the metabolite differences between women with mPTD only and term controls were only seen in phosphatidylethanolamine class. Women with sPTD had significantly different levels of 16 metabolites mainly in amino acid, nucleotide, and steroid classes compared to term controls, of which, anthranilic acid, bilirubin, and steroids also had shared associations in women with mPTD and preeclampsia.

CONCLUSION

In this sample of US high-risk women, PTD/preeclampsia subgroups each showed some unique and shared associations with maternal postpartum plasma metabolites, including those known to be predictors of future CVD. These findings, if validated, may provide new insight into metabolomic alterations underlying clinically observed PTD/preeclampsia subgroups and implications for women's future cardiometabolic health.

A prospective birth cohort study on cord blood folate subtypes and risk of autism spectrum disorder

BACKGROUND

We previously reported that extremely high concentrations of maternal plasma folate were associated with increased risk of autism spectrum disorder (ASD) in children. This study explored whether specific types of folate in cord blood have differential association with ASD.

OBJECTIVES

In the Boston Birth Cohort (BBC), we assessed the association between cord blood unmetabolized folic acid (UMFA), 5-methyl tetrahydrofolate (THF), and total folate and a child's ASD risk. In a subset, we explored whether the association between UMFA and ASD risk can be affected by the dihydrofolate reductase (DHFR) genotype and cord plasma creatinine. We also examined prenatal correlates of cord UMFA concentrations.

METHODS

This report included 567 BBC children (92 ASD, 475 neurotypical), who were recruited at birth and prospectively followed at the Boston Medical Center. ASD was defined from International Classification of Diseases (ICD)-9 and ICD-10 codes documented in electronic medical records.

RESULTS

Children with cord UMFA in the highest, versus lowest quartile, had a greater ASD risk (adjusted OR, aORquartile4: 2.26; 95% CI: 1.08, 4.75). When stratified by race/ethnicity, the association was limited to 311 (45 ASD) Black children (aORquartile4: 9.85; 95% CI: 2.53, 38.31); a test of interaction between race/ethnicity and cord UMFA concentrations was significant (P = 0.007). The UMFA-ASD association in Black children slightly attenuated after adjusting for cord plasma creatinine (P = 0.05). There was no significant association between cord 5-methyl THF, total folate, DHFR genotype, and ASD risk. Cord total folate and maternal supplement intake during second trimester were associated with higher cord UMFA.

CONCLUSIONS

Higher concentrations of cord UMFA, but not 5-methyl THF or total folate, were associated with a greater risk of ASD in Black children. This study in a preterm-birth-enriched cohort raises more questions than it could answer and underscores the need for additional investigations on the sources and role of cord UMFA in children's neurodevelopmental outcomes and underlying mechanisms.

Design, Adoption, Implementation, Scalability, and Sustainability of Telehealth Programs

Telehealth and telemedicine services can be a solution for improving accessibility and reducing the cost of health care. Challenges remain in designing, implementing, and sustainably scaling telehealth solutions. Research is lacking on the health impacts and cost-effectiveness of telehealth; more data are needed in the evaluation of telehealth programs, adjusting for potential participant bias and extending the time frame of evaluating impact. In addition, rethinking and addressing the economic incentives and payment for telehealth services, as well as the medical-legal framework for provider competition across geographic regions (and jurisdictions), are needed for greater adoption of telehealth services.

Connected Pediatric Primary Care for At-Risk Children

Age-specific recommendations contain extensive information that cannot be presented adequately in pediatric preventative care visits. Parental guidance is important, especially for children with social and/or medical risks, but existing evidence-based interventions tend to be resource intensive and difficult to scale. Because the use of mobile technology is now prevalent even among low-income families, the benefits of utilizing the Internet and mobile apps to improve parental guidance are active areas of research. Analyses of patient-generated data from mobile apps may help identify effective ways to use social influences, social learning, and social networks for improving population health.

The Opportunities for Telehealth in Pediatric Practice and Public Health

Telehealth can be delivered asynchronously, synchronously, or through remote patient monitoring. The cost of telehealth, patient use, and effectiveness vary by the technology deployed and by specialty. Telehealth use requires patient and provider adaptability. The improvement of telehealth is restricted by state and federal policies as well as privacy and security concerns. Current telehealth literature provides more consistent evidence of benefits for communication and counseling, and from remote patient monitoring of chronic conditions. However, the benefits and costs of telehealth programs are highly dependent on the technology used, the medical condition studied, and the health care context.

Reintroducing Dyslexia: Early Identification and Implications for Pediatric Practice

Dyslexia is a common learning disorder that renders children susceptible to poor health outcomes and many elements of socioeconomic difficulty. It is commonly undiagnosed until a child has repeatedly failed to learn to read in elementary school; this late diagnosis not only places the child at an academic disadvantage but also can be a precursor to psychiatric comorbidities such as anxiety and depression. Genetic and neuroimaging research have revealed that dyslexia is heritable and that it is undergirded by brain differences that are present even before reading instruction begins. Cognitive-behavioral research has revealed that there are early literacy skill deficits that represent red flags for dyslexia risk and can be measured at a preschool age. Altogether, this evidence points to dyslexia as a disorder that can be flagged by a pediatrician before school entry, during a period of heightened brain plasticity when interventions are more likely to be effective. In this review, we discuss the clinical implications of the most recent advances in dyslexia research, which converge to indicate that early identification and screening are crucial to the prevention or mitigation of adverse secondary consequences of dyslexia. We further highlight evidence-based and practical strategies for the implementation of early risk identification in pediatric practice so that physicians can be empowered in their ability to treat, educate, and advocate for their patients and families with dyslexia.

Association of Cord Plasma Biomarkers of In Utero Acetaminophen Exposure With Risk of Attention-Deficit/Hyperactivity Disorder and Autism Spectrum Disorder in Childhood

IMPORTANCE

Prior studies have raised concern about maternal acetaminophen use during pregnancy and increased risk of attention-deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) in their children; however, most studies have relied on maternal self-report.

OBJECTIVE

To examine the prospective associations between cord plasma acetaminophen metabolites and physician-diagnosed ADHD, ASD, both ADHD and ASD, and developmental disabilities (DDs) in childhood.

DESIGN, SETTING, AND PARTICIPANTS

This prospective cohort study analyzed 996 mother-infant dyads, a subset of the Boston Birth Cohort, who were enrolled at birth and followed up prospectively at the Boston Medical Center from October 1, 1998, to June 30, 2018.

EXPOSURES

Three cord acetaminophen metabolites (unchanged acetaminophen, acetaminophen glucuronide, and 3-[N-acetyl-l-cystein-S-yl]-acetaminophen) were measured in archived cord plasma samples collected at birth.

MAIN OUTCOMES AND MEASURES

Physician-diagnosed ADHD, ASD, and other DDs as documented in the child's medical records.

RESULTS

Of 996 participants (mean [SD] age, 9.8 [3.9] years; 548 [55.0%] male), the final sample included 257 children (25.8%) with ADHD only, 66 (6.6%) with ASD only, 42 (4.2%) with both ADHD and ASD, 304 (30.5%) with other DDs, and 327 (32.8%) who were neurotypical. Unchanged acetaminophen levels were detectable in all cord plasma samples. Compared with being in the first tertile, being in the second and third tertiles of cord acetaminophen burden was associated with higher odds of ADHD diagnosis (odds ratio [OR] for second tertile, 2.26; 95% CI, 1.40-3.69; OR for third tertile, 2.86; 95% CI, 1.77-4.67) and ASD diagnosis (OR for second tertile, 2.14; 95% CI, 0.93-5.13; OR for third tertile, 3.62; 95% CI, 1.62-8.60). Sensitivity analyses and subgroup analyses found consistent associations between acetaminophen buden and ADHD and acetaminophen burden and ASD across strata of potential confounders, including maternal indication, substance use, preterm birth, and child age and sex, for which point estimates for the ORs vary from 2.3 to 3.5 for ADHD and 1.6 to 4.1 for ASD.

CONCLUSIONS AND RELEVANCE

Cord biomarkers of fetal exposure to acetaminophen were associated with significantly increased risk of childhood ADHD and ASD in a dose-response fashion. Our findings support previous studies regarding the association between prenatal and perinatal acetaminophen exposure and childhood neurodevelopmental risk and warrant additional investigations.

Maternal Dyslipidemia, Plasma Branched-Chain Amino Acids, and the Risk of Child Autism Spectrum Disorder: Evidence of Sex Difference

In contrast to the well-observed associations between obesity, diabetes, and autism spectrum disorder (ASD), the roles of maternal dyslipidemia and sex disparity in ASD have not been well-studied. We examined the joint associations of maternal plasma cholesterols, branched-chain amino acids (BCAAs) and child sex on child ASD risk. We analyzed data from 756 mother-infant pairs (86 ASD) from the Boston Birth Cohort. Maternal plasma cholesterols and BCAAs were measured in samples collected 24-72 h postpartum. We found that in this urban, low-income prospective birth cohort, low maternal high-density lipoprotein cholesterol (HDL-C), above-median maternal plasma BCAA concentrations, and male sex additively or synergistically increased risk of ASD. Additional studies are necessary to confirm our findings.

Behavioral Health Integration in a Medicaid Accountable Care Organization: Management Lessons from a Health Center

Behavioral health integration, including as used in Medicaid Accountable Care Organizations, can improve care and decrease costs. Our model strives to integrate fully its medical, behavioral health, and substance use disorder services into one primary care clinic. Merged management has decreased wait times, improved billing, and enabled several promising innovations.

Maternal Obesity/Diabetes, Plasma Branched-Chain Amino Acids, and Autism Spectrum Disorder Risk in Urban Low-Income Children: Evidence of Sex Difference

Maternal metabolic conditions are known risk factors for child autism spectrum disorder (ASD). Branched-chain amino acids (BCAAs) are also associated with ASD. We examined the joint associations of maternal metabolic conditions and BCAAs on the risk of child ASD and whether the associations differed by child's sex. We analyzed 789 mother-infant pairs, a subset of the Boston Birth Cohort, from a predominantly urban, low-income, minority population. Maternal plasma BCAAs were measured by liquid chromatography-tandem mass spectrometry in samples collected 24-72 hr postpartum. A composite BCAA score was created using factor analysis, and prepregnancy obesity and diabetes (ob/DM) were combined into one variable. Logistic regression was used to explore the role of BCAAs as mediators or cofactors with ob/DM and child's sex on ASD risk. BCAA-ob/DM and BCAA-sex interactions were also examined. Maternal BCAAs alone were not associated with ASD and did not mediate the path between ob/DM and ASD. In the presence of maternal ob/DM, BCAA score was significantly associated with ASD (adjusted OR 2.33, 95% CI 1.18, 4.60). Interactions were present for valine with ob/DM and for valine and isoleucine with male sex on ASD risk. The odds ratio (OR) for risk of ASD was the greatest with all three risk factors combined-male sex, above median BCAA score, and ob/DM (OR 10.79, 95% CI 4.40, 26.42). Similar patterns were found for other developmental disorders, though not as strong as for ASD. Additional studies are warranted to clarify the role of maternal BCAAs, ob/DM, and child's sex in ASD. Autism Res 2019, 12: 1562-1573. © 2019 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: This study investigated whether maternal obesity/diabetes and maternal circulating branched-chain amino acids (BCAAs) can jointly affect child ASD risk and whether the associations differ by child's sex. We found that the risk of ASD was greater among mothers with obesity/diabetes who also had elevated concentrations of BCAAs and that this risk was even greater for male children. These findings provide new evidence on fetal origins of ASD and sex difference and warrant additional investigation.

Inter-generational link of obesity in term and preterm births: role of maternal plasma acylcarnitines

BACKGROUND/OBJECTIVES

Acylcarnitines, intermediates of fatty acid oxidation, are known to be involved in obesity and insulin resistance. Since maternal prepregnancy overweight or obesity (OWO) is a recognized major risk factor for offspring OWO, we hypothesized that maternal plasma acylcarnitines may play a role in inter-generational OWO.

SUBJECTS/METHODS

This study included 1402 mother-child pairs (1043 term, 359 preterm) recruited at birth from 1998–2013 and followed prospectively up to age 18 years at the Boston Medical Center. The primary outcomes were child OWO defined as BMI≥85^th percentile for age and sex. The primary exposures were maternal prepregnancy OWO defined as BMI≥25 and maternal acylcarnitine levels measured in plasma samples collected soon after delivery using liquid chromatography–tandem mass spectrometry (LC-MS) in a targeted manner.

RESULTS

Approximately 40% of the children in this study were OWO by age 5. Maternal OWO had a significant association with childhood OWO, both in term and preterm births. β-hydroxybutyryl-carnitine (C4-OH) levels were significantly and positively associated with child OWO among term births after adjustment for potential confounders and multiple-comparisons. Children born to OWO mothers in the top tertile C4-OH levels were at highest risk of OWO: OR=3.78 (95%: 2.47, 5.79) as compared with those born to non-OWO mothers in the lowest tertile (P for interaction of maternal OWO and C4-OH= 0.035). In a four-way decomposition of mediation/interaction analysis, we estimated that C4-OH levels explained about 27% (se=0.08) of inter-generational OWO risk (P=0.001). In contrast, these associations were not observed in preterm births.

CONCLUSIONS

In this U.S. urban low-income birth cohort, we provide further evidence of the inter-generational link of OWO and reveal the differential role of C4-OH in explaining the inter-generational obesity between term and preterm births. Further investigations are warranted to better understand and prevent the inter-generational transmission of OWO.

Prenatal Risk Factors and Perinatal and Postnatal Outcomes Associated With Maternal Opioid Exposure in an Urban, Low-Income, Multiethnic US Population

IMPORTANCE

The opioid epidemic increasingly affects pregnant women and developing fetuses, resulting in high rates of neonatal abstinence syndrome. However, longitudinal studies that prospectively observe newborns with neonatal abstinence syndrome or with maternal opioid use and examine their long-term physical and neurodevelopmental outcomes are lacking.

OBJECTIVE

To examine prenatal risk factors associated with maternal opioid use during pregnancy and the short-term and long-term health consequences on their children.

DESIGN, SETTING, AND PARTICIPANTS

This cohort study analyzed data from the Boston Birth Cohort, an urban, low-income, multiethnic cohort that enrolled mother-newborn pairs at birth at Boston Medical Center (Boston, Massachusetts) starting in 1998, and a subset of children were prospectively observed at Boston Medical Center pediatric primary care and subspecialty clinics from birth to age 21 years. Data analysis began in June 2018 and was completed in May 2019.

EXPOSURES

In utero opioid exposure was defined as maternal self-reported opioid use and/or clinical diagnosis of neonatal abstinence syndrome.

MAIN OUTCOMES AND MEASURES

Pregnancy outcomes, postnatal child physical health, and major neurodevelopmental disabilities, documented in maternal and child medical records.

RESULTS

This study included 8509 Boston Birth Cohort mother-newborn pairs for prenatal and perinatal analyses. Of those, 3153 children continued to receive pediatric care at Boston Medical Center and were included in assessing postnatal outcomes. Overall, 454 of the 8509 children (5.3%) in the Boston Birth Cohort had in utero opioid exposure. At birth, opioid exposure was associated with higher risks of fetal growth restriction (odds ratio [OR], 1.87; 95% CI, 1.41-2.47) and preterm birth (OR, 1.49; 95% CI, 1.19-1.86). Opioid exposure was associated with increased risks of lack of expected physiological development (OR, 1.80; 95% CI, 1.17-2.79) and conduct disorder/emotional disturbance (OR, 2.13; 95% CI, 1.20-3.77) among preschool-aged children. In school-aged children, opioid exposure was associated with a higher risk of attention-deficit/hyperactivity disorder (OR, 2.55; 95% CI, 1.42-4.57).

CONCLUSIONS AND RELEVANCE

In this sample of urban, high-risk, low-income mother-child pairs, in utero opioid exposure was significantly associated with adverse short-term and long-term outcomes across developmental stages, including higher rates of physical and neurodevelopmental disorders in affected children. Efforts to prevent the opioid epidemic and mitigate its health consequences would benefit from more intergenerational research.

Fetal and Infancy Growth Pattern, Cord and Early Childhood Plasma Leptin, and Development of Autism Spectrum Disorder in the Boston Birth Cohort

Leptin is a proinflammatory cytokine that plays an important role in energy homeostasis. Emerging evidence suggests that leptin levels are altered in children with autism spectrum disorder (ASD); however, this has not been studied prospectively. Rapid growth during infancy and early childhood has been implicated in ASD, but the evidence is inconsistent. As leptin is involved in growth and is a potential risk factor for ASD, we explored the associations between (a) cord, early childhood leptin and ASD; and (b) birth weight for gestational age, early childhood weight gain, and ASD. We also assessed the mediating role of leptin in the relationship between weight gain during infancy and ASD. This study was conducted in a sample of 822 subjects from the Boston Birth Cohort. ASD was defined from diagnostic codes in electronic medical records. Extremely rapid weight gain during infancy was associated with a greater ASD risk and this persisted after adjusting for potential confounders (aOR: 3.11; 95% CI: 1.37, 7.07). Similarly, children that had higher plasma leptin levels, prior to ASD diagnosis, had an increased ASD risk in both unadjusted and adjusted models (aOR: 7.87; 95% CI: 2.06, 30.04). Further, early childhood leptin indirectly mediated the relationship between rapid weight gain and ASD. No associations were found between birth weight for gestational age, cord leptin and risk of ASD. Our findings provide a basis to further explore whether the combination of early life growth pattern and a biomarker such as leptin can predict ASD earlier. Autism Res 2018, 11: 1416-1431. © 2018 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: Is early life growth and a biomarker leptin related to ASD risk? To answer this question, we followed 822 children from birth and found that those who gained weight very quickly in infancy, had higher leptin levels in early childhood, had a greater chance of later ASD diagnosis. More research is needed to see if infant's weight gain pattern along with a biomarker (such as leptin) can be used to identify children with ASD sooner.

A Prospective Birth Cohort Study on Early Childhood Lead Levels and Attention Deficit Hyperactivity Disorder: New Insight on Sex Differences

OBJECTIVE

To investigate the prospective associations between early childhood lead exposure and subsequent risk of attention deficit hyperactivity disorder (ADHD) in childhood and its potential effect modifiers.

STUDY DESIGN

We analyzed data from 1479 mother-infant pairs (299 ADHD, 1180 neurotypical) in the Boston Birth Cohort. The child's first blood lead measurement and physician-diagnosed ADHD was obtained from electronic medical records. Graphic plots and multiple logistic regression were used to examine dose-response associations between lead exposure and ADHD and potential effect modifiers, adjusting for pertinent covariables.

RESULTS

We found that 8.9% of the children in the Boston Birth Cohort had elevated lead levels (5-10 µg/dL) in early childhood, which was associated with a 66% increased risk of ADHD (OR, 1.66; 95% CI, 1.08-2.56). Among boys, the association was significantly stronger (OR, 2.49; 95% CI, 1.46-4.26); in girls, the association was largely attenuated (P value for sex-lead interaction = .017). The OR of ADHD associated with elevated lead levels among boys was reduced by one-half if mothers had adequate high-density lipoprotein levels compared with low high-density lipoprotein, or if mothers had low stress compared with high stress during pregnancy.

CONCLUSIONS

Elevated early childhood blood lead levels increased the risk of ADHD. Boys were more vulnerable than girls at a given lead level. This risk of ADHD in boys was reduced by one-half if the mother had adequate high-density lipoprotein levels or low stress. These findings shed new light on the sex difference in ADHD and point to opportunities for early risk assessment and primary prevention of ADHD.

Maternal smoking during pregnancy and cord blood DNA methylation: new insight on sex differences and effect modification by maternal folate levels

Maternal smoking during pregnancy may affect newborn DNA methylation (DNAm). However, little is known about how these associations vary by a newborn's sex and/or maternal nutrition. To fill in this research gap, we investigated epigenome-wide DNAm associations with maternal smoking during pregnancy in African American mother-newborn pairs. DNAm profiling in cord (n = 379) and maternal blood (n = 300) were performed using the Illumina HumanMethylation450 BeadChip array. We identified 12 CpG sites whose DNAm levels in cord blood were associated with maternal smoking, at a false discovery rate <5%. The identified associations in the GFI1 gene were more pronounced in male newborns than in females (P = 0.002 for maternal smoking × sex interaction at cg18146737). We further observed that maternal smoking and folate level may interactively affect cord blood DNAm level at cg05575921 in the AHRR gene (P = 5.0 × 10-4 for interaction): compared to newborns unexposed to maternal smoking and with a high maternal folate level (>19.2 nmol/L), the DNAm level was about 0.03 lower (P = 3.6 × 10-4) in exposed newborns with a high maternal folate level, but was 0.08 lower (P = 1.2 × 10-8) in exposed newborns with a low maternal folate level. Our data suggest that adequate maternal folate levels may partly counteract the impact of maternal smoking on DNAm. These findings may open new avenues of inquiry regarding sex differences in response to environmental insults and novel strategies to mitigate their intergenerational health effects through optimization of maternal nutrition.

Specialized Care without the Subspecialist: A Value Opportunity for Secondary Care

An underutilized value strategy that may reduce unnecessary subspecialty involvement in pediatric healthcare targets the high-quality care of children with common chronic conditions such as obesity, asthma, or attention deficit hyperactivity disorder within primary care settings. In this commentary, we propose that "secondary care", defined as specialized visits delivered by primary care providers, a general pediatrician, or other primary care providers, can obtain the knowledge, skill and, over time, the experience to manage one or more of these common chronic conditions by creating clinical time and space to provide condition-focused care. This care model promotes familiarity, comfort, proximity to home, and leverages the provider's expertise and connections with community-based resources. Evidence is provided to prove that, with multi-disciplinary and subspecialist support, this model of care can improve the quality, decrease the costs, and improve the provider's satisfaction with care.

Folate Nutrition Status in Mothers of the Boston Birth Cohort, Sample of a US Urban Low-Income Population

OBJECTIVES

To examine maternal folic acid supplementation and plasma folate concentrations in the Boston Birth Cohort, a predominantly urban, low-income, minority population in Boston, Massachusetts.

METHODS

This report includes 7612 mothers with singleton live births (3829 Black, 2023 Hispanic, 865 White, and 895 others) enrolled in the Boston Birth Cohort at the Boston Medical Center, during 1999 to 2014. Folic acid supplementation during preconception and each trimester was obtained via interview questionnaire. In a subset (n = 2598), maternal plasma folate concentrations were measured in blood samples drawn within a few days of delivery.

RESULTS

The percentage of mothers taking folic acid supplementation almost daily during preconception and the first, second, and third trimesters were 4.3%, 55.9%, 59.4%, and 58.0%, respectively. Most striking, we observed a wide range of maternal plasma folate concentrations, with approximately 11% insufficient (< 13.4 nmol/L) and 23% elevated (> 45.3 nmol/L).

CONCLUSIONS

Findings indicate that fewer than 5% of mothers in the Boston Birth Cohort started folic acid supplements before pregnancy, and approximately one third of mothers had either too low or too high plasma folate levels, which may have important health consequences on both the mother and the child.

Genome-wide DNA methylation associations with spontaneous preterm birth in US blacks: findings in maternal and cord blood samples

Preterm birth (PTB) affects one in six Black babies in the United States. Epigenetics is believed to play a role in PTB; however, only a limited number of epigenetic studies of PTB have been reported, most of which have focused on cord blood DNA methylation (DNAm) and/or were conducted in white populations. Here we conducted, by far, the largest epigenome-wide DNAm analysis in 300 Black women who delivered early spontaneous preterm (sPTB, n = 150) or full-term babies (n = 150) and replicated the findings in an independent set of Black mother-newborn pairs from the Boston Birth Cohort. DNAm in maternal blood and/or cord blood was measured using the Illumina HumanMethylation450 BeadChip. We identified 45 DNAm loci in maternal blood associated with early sPTB, with a false discovery rate (FDR) <5%. Replication analyses confirmed sPTB associations for cg03915055 and cg06804705, located in the promoter regions of the CYTIP and LINC00114 genes, respectively. Both loci had comparable associations with early sPTB and early medically-indicated PTB, but attenuated associations with late sPTB. These associations could not be explained by cell composition, gestational complications, and/or nearby maternal genetic variants. Analyses in the newborns of the 110 Black women showed that cord blood methylation levels at both loci had no associations with PTB. The findings from this study underscore the role of maternal DNAm in PTB risk, and provide a set of maternal loci that may serve as biomarkers for PTB. Longitudinal studies are needed to clarify temporal relationships between maternal DNAm and PTB risk.

Maternal Multivitamin Intake, Plasma Folate and Vitamin B12 Levels and Autism Spectrum Disorder Risk in Offspring

BACKGROUND

To examine the prospective association between multivitamin supplementation during pregnancy and biomarker measures of maternal plasma folate and vitamin B₁₂ levels at birth and child's Autism Spectrum Disorder (ASD) risk.

METHODS

This report included 1257 mother-child pairs, who were recruited at birth and prospectively followed through childhood at the Boston Medical Center. ASD was defined from diagnostic codes in electronic medical records. Maternal multivitamin supplementation was assessed via questionnaire interview; maternal plasma folate and B₁₂ were measured from samples taken 2-3 days after birth.

RESULTS

Moderate (3-5 times/week) self-reported supplementation during pregnancy was associated with decreased risk of ASD, consistent with previous findings. Using this as the reference group, low (≤2 times/week) and high (>5 times/week) supplementation was associated with increased risk of ASD. Very high levels of maternal plasma folate at birth (≥60.3 nmol/L) had 2.5 times increased risk of ASD [95% confidence interval (CI) 1.3, 4.6] compared to folate levels in the middle 80th percentile, after adjusting for covariates including MTHFR genotype. Similarly, very high B₁₂ (≥536.8 pmol/L) showed 2.5 times increased risk (95% CI 1.4, 4.5).

CONCLUSION

There was a 'U shaped' relationship between maternal multivitamin supplementation frequency and ASD risk. Extremely high maternal plasma folate and B₁₂ levels at birth were associated with ASD risk. This hypothesis-generating study does not question the importance of consuming adequate folic acid and vitamin B₁₂ during pregnancy; rather, raises new questions about the impact of extremely elevated levels of plasma folate and B₁₂ exposure in-utero on early brain development.

Trainees' knowledge, attitudes, and practices towards caring for the substance-exposed mother-infant dyad

BACKGROUND

As rates of substance use disorder during pregnancy rise, pediatric trainees are increasingly caring for infants with neonatal abstinence syndrome (NAS). This study evaluated the knowledge, attitudes, and practices of trainees caring for substance-exposed newborns and their families, comparing differences by level and type of training, and personal experience with addiction or trauma.

METHODS

A cross-sectional survey of medical students and pediatric, medicine/pediatric, and family medicine residents in 2015-2106. Measures included knowledge about NAS, attitudes towards mothers who use drugs, and practices around discussing addiction and trauma with families. Descriptive and bivariate analyses were conducted.

RESULTS

The overall response rate was 70%, with 229 trainees included in the final sample (99 students, 130 residents). Fifty percent of trainees endorsed personal experience with addiction, 50% with trauma, and 35% with both addiction and trauma. Increasing years of pediatric training was associated with greater comfort in managing symptoms of NAS but decreased comfort discussing addiction and trauma. Family medicine and medicine/pediatric residents were more comfortable discussing addiction and trauma than categorical pediatric residents (P < .01). Twenty-two percent of trainees felt confident that mothers would disclose illicit drug use, 39% felt that they would actively care for their infants with NAS, and 43% felt that mothers would not make unreasonable demands. Personal experience with addiction or trauma did not significantly impact trainees' attitudes towards women with substance use disorder.

CONCLUSIONS

Trainees may benefit from educational interventions focused on developing a 2-generational model of trauma-informed care to improve attitudes and ultimately the care of substance-exposed infants and their families.

Infant Regulatory Problems and Obesity in Early Childhood

OBJECTIVE

Difficult infant temperament is associated with higher weight status in infancy. However, the association of infant temperament, including regulatory capacities, has not been well studied as a possible predictor of future weight status in early childhood. We examined prospective associations of infant regulatory difficulties with obesity in early childhood in a large, diverse cohort.

METHODS

We used data from 5750 children in the Early Childhood Longitudinal Study-Birth Cohort, excluding preterm infants and infants small or large for gestational age. Infant regulatory ability was measured at age 9 months by the Infant Toddler Symptom Checklist (ITSC). We created a multivariable logistic regression model comparing risk of obesity at preschool age in infants with ITSC scores ≥6 to infants with scores <6. We further examined the association when stratified by a measure of maternal sensitivity.

RESULTS

The cohort of children was 48% non-Hispanic white, and 51% were boys. Twenty-one percent of children with ITSC scores ≥6 were obese at preschool age. Infants with ITSC scores ≥6 had 32% increased odds of being obese at preschool age (adjusted odds ratio 1.32 [95% confidence interval 1.03, 1.70]). The strongest association existed among children described as demanding attention constantly. There was no difference in the association when comparing mothers with high or low maternal sensitivity.

CONCLUSIONS

Infant regulatory difficulties are associated with a higher risk of obesity at preschool age. Helping parents manage and respond to difficult infant behaviors before preschool may serve as a focal point for future interventions.

Individual and Joint Effects of Early-Life Ambient Exposure and Maternal Prepregnancy Obesity on Childhood Overweight or Obesity

BACKGROUND

Although previous studies suggest that exposure to traffic-related pollution during childhood increases the risk of childhood overweight or obesity (COWO), the role of early life exposure to fine particulate matter (aerodynamic diameter <2.5 μm; PM_2.5) and its joint effect with the mother’s prepregnancy body mass index (MPBMI) on COWO remain unclear.

OBJECTIVES

The present study was conducted to examine the individual and joint effects of ambient PM_2.5 exposures and MPBMI on the risk of COWO.

METHODS

We estimated exposures to ambient PM_2.5in utero and during the first 2 y of life (F2YL), using data from the U.S. Environmental Protection Agency’s (EPA’s) Air Quality System matched to residential address, in 1,446 mother–infant pairs who were recruited at birth from 1998 and followed up prospectively through 2012 at the Boston Medical Center in Massachusetts. We quantified the individual and joint effects of PM_2.5 exposure with MPBMI on COWO, defined as the child’s age- and sex-specific BMI z-score ≥85th percentile at the last well-child care visit between 2 and 9 y of age. Additivity was assessed by estimating the reduced excess risk due to interaction.

RESULTS

Comparing the highest and lowest quartiles of PM_2.5, the adjusted relative risks (RRs) [95% confidence intervals (CIs)] of COWO were 1.3 (95% CI: 1.1, 1.5), 1.2 (95% CI: 1.0, 1.4), 1.2 (95% CI: 1.0, 1.4), 1.3 (95% CI: 1.1, 1.6), 1.3 (95% CI: 1.1, 1.5) and 1.3 (1.1, 1.5) during preconception; the first, second, and third trimesters; the entire period of pregnancy; and F2YL, respectively. Spline regression showed a dose–response relationship between PM_2.5 levels and COWO after a threshold near the median exposure (10.46 μg/m³–10.89 μg/m³). Compared with their counterparts, children of obese mothers exposed to high levels of PM_2.5 had the highest risk of COWO [RR≥2.0, relative excess risk due to interaction (RERI) not significant].

CONCLUSIONS

In the present study, we observed that early life exposure to PM_2.5 may play an important role in the early life origins of COWO and may increase the risk of COWO in children of mothers who were overweight or obese before pregnancy beyond the risk that can be attributed to MPBMI alone. Our findings emphasize the clinical and public health policy relevance of early life PM_2.5 exposure. https://doi.org/10.1289/EHP261

Genome-wide approach identifies a novel gene-maternal pre-pregnancy BMI interaction on preterm birth

Preterm birth (PTB) contributes significantly to infant mortality and morbidity with lifelong impact. Few robust genetic factors of PTB have been identified. Such 'missing heritability' may be partly due to gene × environment interactions (G × E), which is largely unexplored. Here we conduct genome-wide G × E analyses of PTB in 1,733 African-American women (698 mothers of PTB; 1,035 of term birth) from the Boston Birth Cohort. We show that maternal COL24A1 variants have a significant genome-wide interaction with maternal pre-pregnancy overweight/obesity on PTB risk, with rs11161721 (PG × E=1.8 × 10-8; empirical PG × E=1.2 × 10-8) as the top hit. This interaction is replicated in African-American mothers (PG × E=0.01) from an independent cohort and in meta-analysis (PG × E=3.6 × 10-9), but is not replicated in Caucasians. In adipose tissue, rs11161721 is significantly associated with altered COL24A1 expression. Our findings may provide new insight into the aetiology of PTB and improve our ability to predict and prevent PTB.