Genetic correlations in the dental dimensions of Saguinus fuscicollis
Genetic correlations in the dental dimensions of Saguinus fuscicollis
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DOI：
10.1002/ajpa.23861
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发表时间：
2019-07-01
影响因子：
2.8
通讯作者：
Hardin, Anna M.
中科院分区：
文献类型：
--
作者：
Hardin, Anna M.
本研究的目的是描述一种长颈犀灵长类动物牙齿尺寸之间的遗传相关性，评估棕毛绢毛猴牙列是否按牙齿类型表现出遗传模块性，并讨论体型减小与牙齿性状遗传结构之间的关系。材料和方法利用386个个体的谱系，利用SOLAR的最大似然方差分解，估计了302个个体的线性牙齿测量、估计的冠面积、相对前磨牙和磨牙大小的遗传相关性。结果遗传相关估计表明，褐毛绢毛猴牙列具有很强的遗传整合性，而牙齿类型、上下颌骨内部和之间的模块化证据很少。假设狒狒的相对臼齿大小变量具有遗传模式，但该变量没有显著的遗传性，相对前臼齿大小也不符合该种群的遗传模式标准。这些结果证明了灵长类动物牙齿尺寸遗传相关模式的差异，为毛齿动物谱系遗传结构的进化提供了证据。正如这里所展示的，没有牙齿类型模块化的牙齿尺寸的遗传整合，预计会以模块化不会的方式限制牙齿的进化。本文讨论了在牙列遗传结构的进化过程中体型减小的作用。对更多灵长类动物种群牙齿尺寸的定量遗传分析将为灵长类动物牙齿形态遗传结构的变异和进化提供更多证据。
Objectives The objectives of this study are to describe genetic correlations between dental dimensions in a platyrrhine primate, to assess whether the brown-mantled tamarin dentition exhibits genetic modularity by tooth type, and to discuss the relationship between body size reduction and the genetic architecture of dental traits. Materials and methods Genetic correlations were estimated for linear dental measurements, estimated crown areas, and measures of relative premolar and molar size from 302 individuals, using a pedigree of 386 individuals, with maximum likelihood variance decomposition in SOLAR. Results Genetic correlation estimates indicate strong genetic integration in the dentition of brown-mantled tamarins, with little evidence of modularity by tooth type, within and between the maxilla and mandible. The relative molar size variable hypothesized to be genetically patterned in baboons is not significantly heritable, and relative premolar size does not meet the criteria to be considered genetically patterned in this population. Discussion These results demonstrate variation in the pattern of genetic correlations between dental dimensions in primates, providing evidence of evolution of the genetic architecture in the callitrichine lineage. Genetic integration of dental dimensions without modularity by tooth type, as demonstrated here, is expected to constrain dental evolution in ways that modularity would not. The role of body size reduction in the callitrichine lineage in the evolution of the genetic architecture of the dentition is discussed. Quantitative genetic analyses of dental dimensions in more primate populations will provide greater evidence of variation and evolution in the genetic architecture underlying primate dental morphology.