Preferential expression of linear enamel hypoplasia on the sectorial premolars of rhesus monkeys (Macaca mulatta)

Guatelli‐Steinberg, Debbie; Lukacs, John R.

doi:10.1002/(sici)1096-8644(199810)107:2<179::aid-ajpa4>3.0.co;2-q

Cited by 28 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some previous studies have found elevated expression of accessory cusps in samples with evidence of developmental stress (Blankenship-Sefczek, 2019;Riga et al, 2014). However, a recent preliminary study of matrilineal effects on linear enamel hypoplasia in Cayo Santiago rhesus monkeys did not find matriline 076 to have an elevated frequency of this developmental defect relative to the remainder of the sample (Guatelli-Steinberg et al, 2023). Other studies have suggested that the talon cusp might be related to supernumerary teeth (e.g., Mays, 2005); yet in the present study, none of the 16 individuals that exhibited the talon cusp had supernumerary teeth.…”

Section: Discussionmentioning

confidence: 95%

Talon cusp expression in Cayo Santiago rhesus macaques (Macaca mulatta)

Guatelli‐Steinberg,

Kensler,

Francis

et al. 2023

American Journal of Biological Anthropology

View full text Add to dashboard Cite

ObjectivesThis brief communication documents the prevalence of maxillary central incisor talon cusps in Cayo Santiago rhesus monkeys (Macaca mulatta) and assesses whether talon cusp presence occurs at equivalent frequencies across matrilines.Materials and MethodsThe data on cusp presence vs. absence were analyzed by logistic regression in 170 monkeys (82 females, 78 males) from seven different matrilines. Sample sizes per matriline ranged from 10 to 42. Observations of talon cusps were blind with respect to matriline and sex.ResultsTalon cusps were present in 9.4% of the sample. By matriline, cusp frequencies ranged from 0%—Matrilines 073 and 106%—to 19.1% in Matriline 076. The frequency of the talon cusp in Matriline 076 was significantly greater than the frequency of the cusp in the remainder of the sample. There was no statistically significant difference in the frequency of the talon cusp by sex.ConclusionsThis study suggests that the talon cusp in rhesus monkeys, as in humans and baboons, is a rare trait. Elevated prevalence of the talon cusp in Matriline 076 suggests the possibility of a genetic influence on talon cusp expression.

show abstract

Section: Discussionmentioning

confidence: 95%

Talon cusp expression in Cayo Santiago rhesus macaques (Macaca mulatta)

Guatelli‐Steinberg,

Kensler,

Francis

et al. 2023

American Journal of Biological Anthropology

View full text Add to dashboard Cite

show abstract

“…Pterion type differences between matrilines add to the growing body of studies that have utilized known family lineages in the Cayo Santiago population to test for genetic underpinnings of health measures and phenotype (Ebersole et al, 2019;Gonzalez et al, 2016;Guatelli-Steinberg et al, 2023;Li et al, 2018;Zhdanova et al, 2016). The broad conservation of pterion patterning has been established phylogenetically across the species and suborder taxonomic levels (Murphy, 1956).…”

Section: Discussionmentioning

confidence: 99%

Pterion variation in the skulls of rhesus macaques from Cayo Santiago: Inheritance, development, and pathology

Francis,

Wang

2024

The Anatomical Record

View full text Add to dashboard Cite

The pterion is the sutural juncture of the frontal, parietal, sphenoidal, temporal, and zygomatic bones on the lateral aspect of the cranium. As a craniometric landmark, the pterion has a taxonomic valence, in addition to a common neurosurgical entry point in medicine. Variation in the articulation patterns at the pterion have been documented between primate species yet have a high degree of uniformity within species, suggesting a genetic control for this complex region of the skull. In this study, pterion pattern variation was investigated in 1627 Rhesus macaque crania of the Cayo Santiago colony. The colony's associated skeletal collections accompany known age, sex, and maternal lineages. Pterion pattern prevalence rates were tested against matrilines, as well as cranial shape, and cranial sutural fusion ages (including individuals with prematurely fused sutures). Five patterns were identified, the most prominent being the prevailing Old World Monkey frontotemporal (FT) articulation (83.4%). The relative frequency of those not exhibiting the FT pattern was found to vary considerably between matrilineal families (p = 0.037), ranging from 5.3% to 34.2%. Mothers with the non‐FT pterion pattern were three times as likely to bear non‐FT offspring. Cranial shape additionally varied with pterion type. Males exhibiting zygomaticotemporal (ZT) and sphenoparietal (SP) articulations possessed a relatively longer and narrower cranium than those with the default FT type (p = < 0.001). Cranial sutural fusion ages were not found to differ between pterion types, though all individuals with craniosynostosis (6; 0.38%) exhibited the FT type. The study provided strong evidence for a genetic source for pterion pattern as well as outlining a relatively novel relationship with cranial shape and sutural fusion ages. A unifying explanation may lie in those genes involved in both sutural and craniofacial development, or in the variation of brain growth processes channeling sutural articulation at the pterion. Both may be heritable and responsible for producing observed matrilineal differences in the pterion.

show abstract

“…Slow EERs (associated with relatively obtuse striae angles) may create LEH defects that are deeper and more defined (Guatelli-Steinberg et al, 2012;McGrath et al, 2019). In male primates, canines tend to have longer crown formation times compared to incisors (Ash and Nelson, 2003;Reed, 1973), allowing for the accrual of more LEH defects (Guatelli-Steinberg and Lukacs, 1998). However, this individual's canines contained a very large number of extremely shallow defects that often merged into indistinct grooves, preventing accurate discrimination of the boundaries of each defect.…”

Section: Specimen Selectionmentioning

confidence: 99%

A histological study of enamel developmental defects in a chacma baboon (Papio ursinus) incisor

Salaymeh,

Erkens,

Beamish

et al. 2023

DAJ

View full text Add to dashboard Cite

Physiological stress disrupts normal growth creating visible grooves on the enamel surface (i.e., linear enamel hypoplasia or LEH). Hypoplastic defects often, but not always, co-occur with internal accentuated lines (AL). Monkeys reportedly exhibit fewer enamel defects than hominoids as their presumably faster-growing teeth produce shallower LEH defects that are harder to macroscopically identify. In this case study of a chacma baboon (Papio ursinus) incisor, we assessed whether AL are matched by LEH defects; how enamel extension rates and striae angles relate to the surface distribution of LEH defects; and whether striae angles are shallow and rates of enamel extension fast compared to hominoid anterior teeth. We found a higher prevalence of internal AL (N = 48) compared to external LEH defects (N = 10), which co-occurred in all instances of LEH. However, 79.2% of AL defects do not co-occur with LEH defects. The spatial distribution of AL is more consistent, ranging from 3-10/decile, while LEH defects occur mainly in the midcrown and cervical regions. This incisor exhibits faster extension rates (mean = 23.6 µm/day) and shallower striae angles (11-16°) compared to hominoids, likely creating shallower LEH defects and contributing to the discrepancy between AL and LEH defects.

show abstract

Preferential expression of linear enamel hypoplasia on the sectorial premolars of rhesus monkeys (Macaca mulatta)

Cited by 28 publications

References 10 publications

Talon cusp expression in Cayo Santiago rhesus macaques (Macaca mulatta)

Talon cusp expression in Cayo Santiago rhesus macaques (Macaca mulatta)

Pterion variation in the skulls of rhesus macaques from Cayo Santiago: Inheritance, development, and pathology

A histological study of enamel developmental defects in a chacma baboon (Papio ursinus) incisor

Contact Info

Product

Resources

About