Abstract
The Hokkaido Study on Environment and Children’s Health is an ongoing study of two birth cohorts: the Sapporo cohort and the Hokkaido cohort. Our primary goals are (1) to examine the possible effects of low-level environmental chemical exposures, (2) to follow childhood development through a longitudinal observation study, (3) to identify a high-risk group classified by genetic susceptibility, and (4) to identify any additive effects. Maternal and cord blood were collected for an environmental chemical exposure assessment of dioxins, polychlorinated biphenyls, organochlorine pesticides, perfluoroalkyl substances, phthalates, bisphenol A, and methylmercury. Assessments of health outcomes regarding birth size, neurodevelopment, asthma, allergies and infectious diseases, and hormone levels were conducted, along with observation of the children’s growth. Both genetic and epigenetic analyses were also conducted to examine the effects of environmental chemical exposures on a genetically susceptible population and on DNA methylation. Our study suggests that prenatal environmental chemical exposure affects birth size, hormone balance, neurodevelopment, and immune function, even at relatively low levels. Furthermore, specific genotypes may modify the effects of chemical exposure on health outcomes. Epigenetics, such as DNA methylation, may explain in part the mechanism of action.
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Abbreviations
- ADHD-RS:
-
Attention deficit hyperactivity disorder-rating scale
- AHR:
-
Aromatic hydrocarbon receptor
- ASQ:
-
Autism screening questionnaire
- ATS-DLD:
-
American Thoracic Society-Division of Lung Disease classifications
- BiCCA:
-
Birth Cohort Consortium of Asia
- BMI:
-
Body mass index
- BPA:
-
Bisphenol A
- BSID-II:
-
The Bayley Scales of Infant Development-Second Edition
- CBCL:
-
Child behavior checklist
- CI:
-
Confidence interval
- Conners 3P:
-
Conner’s third Edition for Parents
- CYP:
-
Cytochrome P450
- DCDQ:
-
Developmental Coordination Disorder Questionnaire
- DDST:
-
The Denver Developmental Screening Test
- DEHP:
-
Di(2-ethylhexyl) phthalate
- DHEA:
-
Dehydroepiandrostenedione
- DL-PCBs:
-
Dioxin-like polychlorinated biphenyls
- DOHaD:
-
Developmental Origins of Health and Disease
- EES:
-
The Evaluation of Environmental Stimulation
- FT4:
-
Free thyroxine
- FTII:
-
The Fagan Test of Infant Intelligence
- GC/MS:
-
Gas chromatography/mass spectrometry
- GSTM1:
-
Glutathione S-transferase mu 1
- IGF2:
-
Insulin-like growth factor 2
- ISAAC:
-
International Study of Asthma and Allergies in Childhood
- J-PSAI:
-
Japanese Pre-school Activities Inventory
- K-ABC:
-
The Kaufman Assessment Battery for Children
- KIDS:
-
Kinder Infant Development Scale
- KWCST:
-
Wisconsin Card Sorting Test (Keio version)
- LBW:
-
Low birth weight
- LC-MS/MS:
-
Liquid chromatography-tandem mass spectrometry
- LINE1:
-
Long interspersed element 1
- M-CHAT:
-
Modified Checklist for Autism Toddlers
- MDI:
-
Mental Development Index
- Me-Hg:
-
Methylmercury
- MEHP:
-
Mono(2-ethylhexyl) phthalate
- MTHFR:
-
5,10-methylenetetrahydrofolate reductase
- NQO1:
-
Reduced nicotinamide adenine dinucleotide phosphate (NADPH):quinone oxidase 1
- PCDD/PCDF:
-
Polychlorinated dibenzo-p-dioxin/polychlorinated dibenzofuran
- PFASs:
-
Perfluoroalkyl substances
- PFOA:
-
Perfluorooctanoate
- PFOS:
-
Perfluorooctanesulfonic acid
- PI:
-
Ponderal index
- PRL:
-
Prolactin
- SCQ:
-
Social Communication Questionnaire
- SDQ:
-
Strengths and Difficulties Questionnaire
- SES:
-
Social economic status
- SGA:
-
Small for gestational age
- SNPs:
-
Single nucleotide polymorphisms
- T/E2:
-
Testosterone/estradiol ratio
- TEQ:
-
Toxicity equivalency quantity
- TSH:
-
Thyroid-stimulating hormone
- WAIS-R:
-
The Wechsler Adult Intelligence Scale-Revised
- WISC:
-
The Wechsler Intelligence Scale for Children-Third Edition
- XRCC1:
-
X-ray cross-complementing gene 1
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Acknowledgments
We would like to express our appreciation to all the study participants and all the personnel in hospitals and clinics that collaborated with the Hokkaido study on environment and children’s health. The Hokkaido study is supported by Grant-in-Aid for Scientific Research from the Japanese Ministry of Health, Labour and Welfare; Japan Society for the Promotion of Science; the Ministry of Education, Culture, Sports, Science and Technology; and Environment Research and Technology Development Fund.
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Kishi, R., Araki, A., Miyashita, C., Kobayashi, S., Miura, R., Minatoya, M. (2019). The Hokkaido Study on Environment and Children’s Health. In: Sata, F., Fukuoka, H., Hanson, M. (eds) Pre-emptive Medicine: Public Health Aspects of Developmental Origins of Health and Disease. Current Topics in Environmental Health and Preventive Medicine. Springer, Singapore. https://doi.org/10.1007/978-981-13-2194-8_9
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