Stress exposure histories revealed by biochemical changes along accentuated lines in teeth

Austin, Christine; Kumar, Piyush; Carter, Elizabeth A.; Lee, Joonsup; Smith, Tanya M.; Hinde, Katie; Arora, Manish; Lay, Peter A.

doi:10.1016/j.chemosphere.2023.138673

Cited by 8 publications

(2 citation statements)

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“…In histological cross-sections where prism crossstriations are clearly visible, these can be measured to calculate the daily enamel secretion rate (DSR) within a given tooth (Antoine et al, 2009;Aris, 2022;Aris et al, 2020;Aris & Street, 2021;Mahoney, 2008;Mahoney et al, 2017;. Disruptions to amelogenesis can result in accentuated lines (ALs) that are visible in thin sections under light microscopy, commonly referred to as Wilson bands, accentuated brown striae, or ALs (Aris, 2020;Austin et al, 2023;FitzGerald & Saunders, 2005;Rose et al, 1978Rose et al, , 1984Wilson & Shroff, 1970). These bands may or may not correspond with an enamel surface defect (Goodman & Rose, 1990;Mahoney et al, 2017;Witzel et al, 2008) and can be distinguished from Retzius lines as they are irregular in width, darker, and visible along more of their length between the dentinoenamel junction (DEJ) and the enamel surface (Figure 2c) and may not correlate with regular Retzius line spacing (Antoine et al, 2019;Goodman & Rose, 1990).…”

Section: Enamel Developmentmentioning

confidence: 99%

Nostalgia for the old country—A histological exploration of early childhood physiological stress experiences in colonial Otago, New Zealand

Kavale‐Henderson,

Buckley,

King

et al. 2024

Intl J of Osteoarchaeology

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Many mid‐19th‐century immigrants to New Zealand are presumed to have been in pursuit of a “better life” than was achievable in their origin countries. Here, we utilize histological analyses of internal indicators of enamel growth disruption (accentuated lines [ALs]) in 19 European and Chinese immigrants and five colony‐born children from three 19th‐century Otago sites. Observations of regular enamel microstructure were used to estimate a chronology of periods of enamel growth disruption. Clear or potential ALs were present in 18/19 (95%) adults and 4/5 (80%) subadults. Mean occurrence of ALs was higher in Chinese individuals than in European individuals between birth and 1 year of age (Chinese mean = 11; European mean = 3.8) and between 3 and 5 years of age (Chinese mean = 12.7; European mean = 1.3). Potential prenatal ALs were observed in three colony‐born children. Although similar stressors such as malnutrition and infectious disease would have been present in both Europe and China, their expression in these individuals may reflect the embodiment of different push factors that stimulated emigration to New World colonies such as New Zealand. The presence of ALs in colony‐born children indicates some continuation of developmental stressors in New Zealand. The results presented here highlight the value of utilizing microscopic analyses on poorly preserved archeological samples that are frequently excluded from histological examination. This preliminary glimpse into enamel formation disruption challenges the ubiquitous 19th‐century narrative of New Zealand as free from the hardships of industrial revolution era Europe and sheds light on the stresses of childhoods spent in rural China and the potential attractions of the Pacific goldfields in comparison. Future work with larger sample sizes will contribute to a critical exploration of experiences of childhood physiological stress in those who lived and died in colonial New Zealand.

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Section: Enamel Developmentmentioning

confidence: 99%

Nostalgia for the old country—A histological exploration of early childhood physiological stress experiences in colonial Otago, New Zealand

Kavale‐Henderson,

Buckley,

King

et al. 2024

Intl J of Osteoarchaeology

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“…Teeth can therefore be used as storage for various exposures during the tooth formation period. Additionally, dental tissue shows morphological changes and mineralisation defects because of exposures to environmental toxins, disease, or malnutrition during tooth formation (Arora et al, 2012(Arora et al, , 2011Austin et al, 2013Austin et al, , 2016Austin et al, , 2023Smith et al, 2021;Smith and Boesch, 2015).…”

Section: Introductionmentioning

confidence: 99%

Toxic and Essential Trace Elements in Human Primary Teeth: A Baseline Study within the Mobatooth Biobank and the Norwegian Mother, Father and Child Cohort Study (Moba)

Jensen

Austin

Arora

et al. 2023

Preprint

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Brief communication: New method for measuring nitrogen isotopes in tooth dentine at high temporal resolution

Smith,

Ávila,

Arora

et al. 2024

American Journal of Biological Anthropology

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ObjectivesNitrogen isotopes (δ15N) are widely used to study human nursing and weaning ages. Conventional methods involve sampling 1‐mm thick sections of tooth dentine—producing an averaging effect that integrates months of formation. We introduce a novel protocol for measuring δ15N by multicollector secondary ion mass spectrometry (SIMS).Materials and MethodsWe sampled dentine δ15N on a weekly to monthly basis along the developmental axis in two first molars of healthy children from Australia and New Zealand (n = 217 measurements). Nitrogen isotope ratios were determined from measurements of CN− secondary molecular ions in ~35 μm spots. By relating spot position to enamel formation, we identified prenatal dentine, as well as sampling ages over more than 3 years. We also created calcium‐normalized barium and strontium maps with laser ablation‐inductively coupled plasma‐mass spectrometry.ResultsWe found rapid postnatal δ15N increases of ~2‰–3‰, during which time the children were exclusively breastfed, followed by declines as the breastfeeding frequency decreased. After weaning, δ15N values remained stable for several months, coinciding with diets that did not include meat or cow's milk; values then varied by ~2‰ starting in the third year of life. Barium did not show an immediate postnatal increase, rising after a few months until ~1–1.5 years of age, and falling until or shortly after the cessation of suckling. Initial strontium trends varied but both individuals peaked months after weaning.DiscussionDevelopmentally informed SIMS measurements of δ15N minimize time averaging and can be precisely related to an individual's early dietary history.

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Stress exposure histories revealed by biochemical changes along accentuated lines in teeth

Cited by 8 publications

References 50 publications

Nostalgia for the old country—A histological exploration of early childhood physiological stress experiences in colonial Otago, New Zealand

Nostalgia for the old country—A histological exploration of early childhood physiological stress experiences in colonial Otago, New Zealand

Toxic and Essential Trace Elements in Human Primary Teeth: A Baseline Study within the Mobatooth Biobank and the Norwegian Mother, Father and Child Cohort Study (Moba)

Brief communication: New method for measuring nitrogen isotopes in tooth dentine at high temporal resolution

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