Associations of Prenatal Mercury Exposure and PUFA with Telomere Length and mtDNA Copy Number in 7-Year-Old Children in the Seychelles Child Development Nutrition Cohort 2
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| Název: | Associations of Prenatal Mercury Exposure and PUFA with Telomere Length and mtDNA Copy Number in 7-Year-Old Children in the Seychelles Child Development Nutrition Cohort 2 |
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| Autoři: | Stajnko, Anja, Pineda, Daniela, Klus, Jonathan K, Love, Tanzy M, Thurston, Sally W, Mulhern, Maria S, Strain, J J, McSorley, Emeir M, Myers, Gary J, Watson, Gene E, Shroff, Emelyn, Shamlaye, Conrad F, Yeates, Alison J, van Wijngaarden, Edwin, Broberg, Karin |
| Zdroj: | Environmental Health Perspectives; 133(2), no 027002 (2025) ; ISSN: 1552-9924 |
| Informace o vydavateli: | National Institute of Environmental Health Sciences |
| Rok vydání: | 2025 |
| Sbírka: | Lund University Publications (LUP) |
| Témata: | Occupational Health and Environmental Health, Humans, Female, Seychelles, Child, Pregnancy, Mercury/blood, Telomere/drug effects, Prenatal Exposure Delayed Effects, Fatty Acids, Unsaturated, Male, DNA, Mitochondrial, DNA Copy Number Variations, Hair/chemistry, Cohort Studies, Fetal Blood/chemistry, Environmental Pollutants/blood, Environmental Exposure/statistics & numerical data |
| Popis: | BACKGROUND: Telomere length (TL) and mitochondrial DNA copy number (mtDNAcn) variations are linked to age-related diseases and are associated with environmental exposure and nutritional status. Limited data, however, exist on the associations with mercury exposure, particularly early in life.OBJECTIVE: We examined the association between prenatal mercury (Hg) exposure and TL and mtDNAcn in 1,145 Seychelles children, characterized by a fish-rich diet.METHODS: Total mercury (THg) was determined in maternal hair at delivery and cord blood. TL and mtDNAcn were determined relative to a single-copy hemoglobin beta gene in the saliva of 7-y-old children. Linear regression models assessed associations between THg and relative TL (rTL) and relative mtDNAcn (rmtDNAcn) while controlling for maternal and cord serum polyunsaturated fatty acid (PUFA) status and sociodemographic factors. Interactions between THg and child sex, PUFA, and telomerase genotypes were evaluated for rTL and rmtDNAcn.RESULTS: Higher THg concentrations in maternal hair and cord blood were associated with longer rTL [ β = 0.009 ; 95% confidence interval (CI): 0.002, 0.016 and β = 0.002 ; 95% CI: 0.001, 0.003, respectively], irrespective of sex, PUFA, or telomerase genotypes. Maternal serum n-6 PUFA and n-6/n-3 ratio were associated with shorter [ β = - 0.24 ; 95% CI: - 0.33 , - 0.15 and β = - 0.032 ; 95% CI: - 0.048 , - 0.016 , respectively] and n - 3 PUFA with longer ( β = 0.34 ; 95% CI: 0.032, 0.65) rTL. Cord blood n-6 PUFA was associated with longer ( β = 0.15 ; 95% CI: 0.050, 0.26) rTL. Further analyses revealed linoleic acid in maternal blood and arachidonic acid in cord blood as the main drivers of the n-6 PUFA associations. No associations were observed for THg and PUFA with rmtDNAcn. DISCUSSION: Our results indicate that prenatal THg exposure and PUFA status are associated with rTL later in childhood, although not consistently aligned with our initial hypothesis. Subsequent research is needed to confirm this finding, further evaluate the ... |
| Druh dokumentu: | article in journal/newspaper |
| Jazyk: | English |
| Relation: | http://dx.doi.org/10.1289/EHP14776; scopus:85218027999; pmid:39903555 |
| DOI: | 10.1289/EHP14776 |
| Dostupnost: | https://lup.lub.lu.se/record/79c338a4-46d0-4c69-9b8e-bb702dac2213 https://doi.org/10.1289/EHP14776 |
| Přístupové číslo: | edsbas.F5CD8DB3 |
| Databáze: | BASE |
Nájsť tento článok vo Web of Science | Abstrakt: | BACKGROUND: Telomere length (TL) and mitochondrial DNA copy number (mtDNAcn) variations are linked to age-related diseases and are associated with environmental exposure and nutritional status. Limited data, however, exist on the associations with mercury exposure, particularly early in life.OBJECTIVE: We examined the association between prenatal mercury (Hg) exposure and TL and mtDNAcn in 1,145 Seychelles children, characterized by a fish-rich diet.METHODS: Total mercury (THg) was determined in maternal hair at delivery and cord blood. TL and mtDNAcn were determined relative to a single-copy hemoglobin beta gene in the saliva of 7-y-old children. Linear regression models assessed associations between THg and relative TL (rTL) and relative mtDNAcn (rmtDNAcn) while controlling for maternal and cord serum polyunsaturated fatty acid (PUFA) status and sociodemographic factors. Interactions between THg and child sex, PUFA, and telomerase genotypes were evaluated for rTL and rmtDNAcn.RESULTS: Higher THg concentrations in maternal hair and cord blood were associated with longer rTL [ β = 0.009 ; 95% confidence interval (CI): 0.002, 0.016 and β = 0.002 ; 95% CI: 0.001, 0.003, respectively], irrespective of sex, PUFA, or telomerase genotypes. Maternal serum n-6 PUFA and n-6/n-3 ratio were associated with shorter [ β = - 0.24 ; 95% CI: - 0.33 , - 0.15 and β = - 0.032 ; 95% CI: - 0.048 , - 0.016 , respectively] and n - 3 PUFA with longer ( β = 0.34 ; 95% CI: 0.032, 0.65) rTL. Cord blood n-6 PUFA was associated with longer ( β = 0.15 ; 95% CI: 0.050, 0.26) rTL. Further analyses revealed linoleic acid in maternal blood and arachidonic acid in cord blood as the main drivers of the n-6 PUFA associations. No associations were observed for THg and PUFA with rmtDNAcn. DISCUSSION: Our results indicate that prenatal THg exposure and PUFA status are associated with rTL later in childhood, although not consistently aligned with our initial hypothesis. Subsequent research is needed to confirm this finding, further evaluate the ... |
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| DOI: | 10.1289/EHP14776 |