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Type: Journal article
Title: Genetic correlation, pleiotropy, and molar morphology in a longitudinal sample of Australian twins and families
Author: Paul, K.
Stojnanowski, C.
Hughes, T.
Brook, A.
Townsend, G.
Citation: Genes, 2022; 13(6):996-996
Publisher: MDPI
Issue Date: 2022
ISSN: 2073-4425
Statement of
Kathleen S. Paul, Christopher M. Stojanowski, Toby Hughes, Alan H. Brook, and Grant C. Townsend
Abstract: This study aims to expand our understanding of the genetic architecture of crown morphology in the human diphyodont dentition. Here, we present bivariate genetic correlation estimates for deciduous and permanent molar traits and evaluate the patterns of pleiotropy within (e.g., m1–m2) and between (e.g., m2–M1) dentitions. Morphology was observed and scored from dental models representing participants of an Australian twin and family study (deciduous n = 290, permanent n = 339). Data collection followed Arizona State University Dental Anthropology System standards. Genetic correlation estimates were generated using maximum likelihood variance components analysis in SOLAR v.8.1.1. Approximately 23% of deciduous variance components models and 30% of permanent variance components models yielded significant genetic correlation estimates. By comparison, over half (56%) of deciduous–permanent homologues (e.g., m² hypocone–M¹ hypocone) were significantly genetically correlated. It is generally assumed that the deciduous and permanent molars represent members of a meristic molar field emerging from the primary dental lamina. However, stronger genetic integration among m2–M1/M2 homologues than among paired deciduous traits suggests the m2 represents the anterior-most member of a “true” molar field. The results indicate genetic factors act at distinct points throughout development to generate homologous molar form, starting with the m2, which is later replaced by a permanent premolariform crown.
Keywords: quantitative genetics; molar morphology; pleiotropy; dental development
Rights: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
DOI: 10.3390/genes13060996
Appears in Collections:Dentistry publications

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