A Late Middle Pleistocene human tooth from the Luonan Basin (Shaanxi, China)

Zhang, Gaike; Xing, Song; Martinón‐Torres, María; Castro, José Marı́a Bermúdez de; Wang, Shejiang

doi:10.1016/j.jhevol.2023.103343

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…Dental anthropological analyses often utilize nonmetric crown traits to assess the degree of similarity among global populations [ 1 – 17 ], detect biological kinship within a site [ 18 – 29 ], establish phylogenetic relationships across extinct and extant hominoid taxa [ 30 – 49 ], explore the population history associated with specific groups or geographic regions [ 50 – 70 ], and more recently, to estimate population affinity in recently deceased individuals as part of the biological profile [ 71 – 82 ]. The nonmetric crown traits dental anthropologists rely upon to conduct these analyses include the presence and expression of accessory cusps.…”

Section: Introductionmentioning

confidence: 99%

Evaluating predictions of the patterning cascade model of crown morphogenesis in the human lower mixed and permanent dentition

Kenessey,

Stojanowski,

Paul

2024

PLoS ONE

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Objective The patterning cascade model of crown morphogenesis has been studied extensively in a variety of organisms to elucidate the evolutionary history surrounding postcanine tooth form. The current research is the first to use a large modern human sample to examine whether the crown configuration of lower deciduous and permanent molars aligns with expectations derived from the model. This study has two main goals: 1) to determine if metameric and antimeric pairs significantly differ in size, accessory trait expression, and relative intercusp spacing, and 2) assess whether the relative distance among early-forming cusps accounts for observed variation in accessory cusp expression. Methods Tooth size, intercusp distance, and morphological trait expression data were collected from 3D scans of mandibular dental casts representing participants of the Harvard Solomon Islands Project. Paired tests were utilized to compare tooth size, accessory trait expression, and relative intercusp distance between diphyodont metameres and permanent antimeres. Proportional odds logistic regression was implemented to investigate how the odds of greater accessory cusp expression vary as a function of the distance between early-developing cusps. Results/Significance Comparing paired molars, significant differences were identified for tooth size and cusp 5 expression. Several relative intercusp distances emerged as important predictors of cusp 6 expression, however, results for cusp 5 and cusp 7 did not match expected patterns. These findings support previous quantitative genetic results and suggest the development of neighboring crown structures represents a zero-sum partitioning of cellular territory and resources. As such, this study contributes to a better understanding of the foundations of deciduous and permanent molar crown variation in humans.

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Section: Introductionmentioning

confidence: 99%

Evaluating predictions of the patterning cascade model of crown morphogenesis in the human lower mixed and permanent dentition

Kenessey,

Stojanowski,

Paul

2024

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Dental anthropological analyses often utilize nonmetric crown traits to assess the degree of similarity among global populations [1–17], detect biological kinship within a site [18–29], establish phylogenetic relationships across taxa [30–49], explore the population history associated with specific groups or geographic regions [50–70], and more recently, to estimate population affinity in recently deceased individuals as part of the biological profile [71–82]. The nonmetric crown traits that dental anthropologists rely upon to conduct these analyses include the presence and expression of accessory cusps.…”

Section: Introductionmentioning

confidence: 99%

“…Dental anthropological analyses often utilize nonmetric crown traits to assess the degree of similarity among global populations [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], detect biological kinship within a site [18][19][20][21][22][23][24][25][26][27][28][29], establish phylogenetic relationships across taxa [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49], explore the population history associated with specific groups or geographic regions , and more recently, to...…”

Section: Introductionmentioning

confidence: 99%

Evaluating the patterning cascade model of tooth morphogenesis in the human lower mixed and permanent dentition

Kenessey,

Stojanowski,

Paul

2023

Preprint

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Objective: The patterning cascade model of crown morphogenesis has been studied extensively in a variety of organisms to elucidate the evolutionary history surrounding postcanine tooth form. The current research examines the degree to which model expectations are reflected in the crown configuration of lower deciduous and permanent molars in a modern human sample. This study has two main goals: 1) to determine if metameric and antimeric pairs significantly differ in size, accessory trait expression, and relative intercusp spacing, and 2) to establish if the relative distance among early-forming cusps accounts for observed variation in accessory cusp expression. Methods: Tooth size, intercusp distance, and morphological trait expression data were collected from 3D scans of mandibular dental casts representing 124 individual participants of the Harvard Solomon Islands Project. Paired tests were utilized to compare tooth size, accessory trait expression, and relative intercusp distance between diphyodont metameres and permanent antimeres. Proportional odds logistic regression was implemented to investigate how the likelihood of accessory cusp formation varies as a function of the distance between early-developing cusps. Results/Significance: For paired molars, results indicated significant discrepancies in tooth size and cusp 5 expression, but not cusp 6 and cusp 7 expression. Several relative intercusp distances emerged as important predictors of accessory cusp expression. These findings support previous quantitative genetic results and suggest the development of neighboring crown structures represents a zero-sum partitioning of cellular territory and resources. As such, this study contributes to a better understanding of the evolution of deciduous and permanent molar crown configuration in humans.

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Terminologies associated with “early <italic>Homo sapiens</italic>” and their evolutionary status

ZHAO,

XING

2024

Prehistory

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A Late Middle Pleistocene human tooth from the Luonan Basin (Shaanxi, China)

Cited by 3 publications

References 27 publications

Evaluating predictions of the patterning cascade model of crown morphogenesis in the human lower mixed and permanent dentition

Evaluating predictions of the patterning cascade model of crown morphogenesis in the human lower mixed and permanent dentition

Evaluating the patterning cascade model of tooth morphogenesis in the human lower mixed and permanent dentition

Terminologies associated with “early <italic>Homo sapiens</italic>” and their evolutionary status

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A Late Middle Pleistocene human tooth from the Luonan Basin (Shaanxi, China)

Cited by 3 publications

References 27 publications

Evaluating predictions of the patterning cascade model of crown morphogenesis in the human lower mixed and permanent dentition

Evaluating predictions of the patterning cascade model of crown morphogenesis in the human lower mixed and permanent dentition

Evaluating the patterning cascade model of tooth morphogenesis in the human lower mixed and permanent dentition

Terminologies associated with &ldquo;early &lt;italic&gt;Homo sapiens&lt;/italic&gt;&rdquo; and their evolutionary status

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Terminologies associated with “early <italic>Homo sapiens</italic>” and their evolutionary status