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https://www.readbyqxmd.com/read/28533441/trends-in-dna-methylation-with-age-replicate-across-diverse-human-populations
#1
Shyamalika Gopalan, Oana Carja, Maud Fagny, Etienne Patin, Justin W Myrick, Lisa M McEwen, Sarah M Mah, Michael S Kobor, Alain Froment, Marcus W Feldman, Lluis Quintana-Murci, Brenna M Henn
Aging is associated with widespread changes in genome-wide patterns of DNA methylation. Thousands of CpG sites whose tissue-specific methylation levels are strongly correlated with chronological age have been previously identified. However, the majority of these studies have focused primarily on cosmopolitan populations living in the developed world; it is not known if age-related patterns of DNA methylation at these loci are similar across a broad range of human genetic and ecological diversity. We investigated genome-wide methylation patterns using saliva- and whole blood-derived DNA from two traditionally hunting and gathering African populations: the Baka of the western Central African rainforest and the ≠Khomani San of the South African Kalahari Desert...
May 22, 2017: Genetics
https://www.readbyqxmd.com/read/28507529/parkinson-disease-an-evolutionary-perspective
#2
Pedro J Garcia-Ruiz, Alberto J Espay
There are two central premises to this evolutionary view of Parkinson disease (PD). First, PD is a specific human disease. Second, the prevalence of PD has increased over the course of human history. Several lines of evidence may explain why PD appears to be restricted to the human species. The major manifestations of PD are the consequence of degeneration in the dopamine-synthesizing neurons of the mesostriatal neuronal pathway. It is of note the enormous expansion of the human dopamine mesencephalic neurons onto the striatum compared with other mammals...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28499932/dietary-customs-and-food-availability-shape-the-preferences-for-basic-tastes-a-cross-cultural-study-among-polish-tsimane-and-hadza-societies
#3
Agnieszka Sorokowska, Robert Pellegrino, Marina Butovskaya, Michalina Marczak, Agnieszka Niemczyk, Tomas Huanca, Piotr Sorokowski
Biological significance of food components suggests that preferences for basic tastes should be similar across cultures. On the other hand, cultural factors play an important role in diet and can consequently influence individual preference for food. To date, very few studies have compared basic tastes preferences among populations of very diverse environmental and cultural conditions, and research rather did not involve traditional populations for whom the biological significance of different food components might be the most pronounced...
May 9, 2017: Appetite
https://www.readbyqxmd.com/read/28489015/tracking-the-evolution-of-causal-cognition-in-humans
#4
Marlize Lombard, Peter Gärdenfors
We suggest a seven-grade model for the evolution of causal cognition as a framework that can be used to gauge variation in the complexity of causal reasoning from the panin-hominin split until the appearance of cognitively modern hunter-gatherer communities. The intention is to put forward a cohesive model for the evolution of causal cognition in humans, which can be assessed against increasingly fine-grained empirical data from the palaeoanthropological and archaeological records. We propose that the tracking behaviour (i...
May 8, 2017: Journal of Anthropological Sciences, Rivista di Antropologia: JASS
https://www.readbyqxmd.com/read/28488767/an-assessment-of-postcranial-indices-ratios-and-body-mass-versus-eco-geographical-variables-of-prehistoric-jomon-yayoi-agriculturalists-and-kumejima-islanders-of-japan
#5
Noriko Seguchi, Conrad B Quintyn, Shiori Yonemoto, Hirofumi Takamuku
OBJECTIVES: We explore variations in body and limb proportions of the Jomon hunter-gatherers (14,000-2500 BP), the Yayoi agriculturalists (2500-1700 BP) of Japan, and the Kumejima Islanders of the Ryukyus (1600-1800 AD) with 11 geographically diverse skeletal postcranial samples from Africa, Europe, Asia, Australia, and North America using brachial-crural indices, femur head-breadth-to-femur length ratio, femur head-breadth-to-lower-limb-length ratio, and body mass as indicators of phenotypic climatic adaptation...
May 10, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28464262/a-tale-of-agriculturalists-and-hunter-gatherers-exploring-the-thrifty-genotype-hypothesis-in-native-south-americans
#6
Guillermo Reales, Diego L Rovaris, Vanessa C Jacovas, Tábita Hünemeier, José R Sandoval, Alcibiades Salazar-Granara, Darío A Demarchi, Eduardo Tarazona-Santos, Aline B Felkl, Michele A Serafini, Francisco M Salzano, Rafael Bisso-Machado, David Comas, Vanessa R Paixão-Côrtes, Maria Cátira Bortolini
OBJECTIVES: To determine genetic differences between agriculturalist and hunter-gatherer southern Native American populations for selected metabolism-related markers and to test whether Neel's thrifty genotype hypothesis (TGH) could explain the genetic patterns observed in these populations. MATERIALS AND METHODS: 375 Native South American individuals from 17 populations were genotyped using six markers (APOE rs429358 and rs7412; APOA2 rs5082; CD36 rs3211883; TCF7L2 rs11196205; and IGF2BP2 rs11705701)...
May 2, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28450590/in-surprise-tooth-decay-afflicts-hunter-gatherers
#7
Ann Gibbons
No abstract text is available yet for this article.
April 28, 2017: Science
https://www.readbyqxmd.com/read/28442785/hunter-gatherer-social-networks-and-reproductive-success
#8
Abigail E Page, Nikhil Chaudhary, Sylvain Viguier, Mark Dyble, James Thompson, Daniel Smith, Gul D Salali, Ruth Mace, Andrea Bamberg Migliano
Individuals' centrality in their social network (who they and their social ties are connected to) has been associated with fertility, longevity, disease and information transmission in a range of taxa. Here, we present the first exploration in humans of the relationship between reproductive success and different measures of network centrality of 39 Agta and 38 BaYaka mothers. We collected three-meter contact ('proximity') networks and reproductive histories to test the prediction that individual centrality is positively associated with reproductive fitness (number of living offspring)...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28434535/fruits-of-the-forest-human-stable-isotope-ecology-and-rainforest-adaptations-in-late-pleistocene-and-holocene-%C3%A2-36-to-3-ka-sri-lanka
#9
Patrick Roberts, Nimal Perera, Oshan Wedage, Siran Deraniyagala, Jude Perera, Saman Eregama, Michael D Petraglia, Julia A Lee-Thorp
Sri Lanka has yielded some of the earliest dated fossil evidence for Homo sapiens (∼38-35,000 cal. years BP [calibrated years before present]) in South Asia, within a region that is today covered by tropical rainforest. Archaeozoological and archaeobotanical evidence indicates that these hunter-gatherers exploited tropical forest resources, yet the contribution of these resources to their overall subsistence strategies has, as in other Late Pleistocene rainforest settings, remained relatively unexplored...
May 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28431626/sleep-patterns-in-villagers-and-urban-african-volunteers-in-a-humid-tropical-climate-influence-of-accessibility-to-electric-light
#10
Alain Buguet, Pascal Bogui, Stéphane Picot, Raymond Cespuglio
Recent publications focusing on sleep-wake alternation, using actigraphic recordings in hunter-gatherers, stressed the existence of a potential effect of electricity availability on sleep habits. These reports prompted us to achieve a new analysis of the polysomnographic data already obtained in healthy African volunteers in equatorial Africa during two different investigations. Comparison of the 24-h polysomnographic sleep patterns were done between 9 volunteers sleeping in a laboratory in Abidjan (Abidjan cohort) and 11 villagers living in electricity-free bush villages (Sinfra cohort)...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28426763/individual-based-modelling-of-population-growth-and-diffusion-in-discrete-time
#11
Natalie Tkachenko, John D Weissmann, Wesley P Petersen, George Lake, Christoph P E Zollikofer, Simone Callegari
Individual-based models (IBMs) of human populations capture spatio-temporal dynamics using rules that govern the birth, behavior, and death of individuals. We explore a stochastic IBM of logistic growth-diffusion with constant time steps and independent, simultaneous actions of birth, death, and movement that approaches the Fisher-Kolmogorov model in the continuum limit. This model is well-suited to parallelization on high-performance computers. We explore its emergent properties with analytical approximations and numerical simulations in parameter ranges relevant to human population dynamics and ecology, and reproduce continuous-time results in the limit of small transition probabilities...
2017: PloS One
https://www.readbyqxmd.com/read/28426286/on-the-evolution-of-lactase-persistence-in-humans
#12
Laure Ségurel, Céline Bon
Lactase persistence-the ability of adults to digest the lactose in milk-varies widely in frequency across human populations. This trait represents an adaptation to the domestication of dairying animals and the subsequent consumption of their milk. Five variants are currently known to underlie this phenotype, which is monogenic in Eurasia but mostly polygenic in Africa. Despite being a textbook example of regulatory convergent evolution and gene-culture coevolution, the story of lactase persistence is far from clear: Why are lactase persistence frequencies low in Central Asian herders but high in some African hunter-gatherers?Whywas lactase persistence strongly selected for even though milk processing can reduce the amount of lactose? Are there other factors, outside of an advantage of caloric intake, that contributed to the selective pressure for lactase persistence? It is time to revisit what we know and still do not know about lactase persistence in humans...
April 19, 2017: Annual Review of Genomics and Human Genetics
https://www.readbyqxmd.com/read/28424643/oral-storytelling-as-evidence-of-pedagogy-in-forager-societies
#13
Michelle Scalise Sugiyama
Teaching is reportedly rare in hunter-gatherer societies, raising the question of whether it is a species-typical trait in humans. A problem with past studies is that they tend to conceptualize teaching in terms of Western pedagogical practices. In contrast, this study proceeds from the premise that teaching requires the ostensive manifestation of generalizable knowledge: the teacher must signal intent to share information, indicate the intended recipient, and transmit knowledge that is applicable beyond the present context...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28407013/dietary-resilience-among-hunter-gatherers-of-tierra-del-fuego-isotopic-evidence-in-a-diachronic-perspective
#14
Mary Anne Tafuri, Atilio Francisco Javier Zangrando, Augusto Tessone, Sayuri Kochi, Jacopo Moggi Cecchi, Fabio Di Vincenzo, Antonio Profico, Giorgio Manzi
The native groups of Patagonia have relied on a hunter-gatherer economy well after the first Europeans and North Americans reached this part of the world. The large exploitation of marine mammals (i.e., seals) by such allochthonous groups has had a strong impact on the local ecology in a way that might have forced the natives to adjust their subsistence strategies. Similarly, the introduction of new foods might have changed local diet. These are the premises of our isotopic-based analysis. There is a large set of paleonutritional investigations through isotopic analysis on Fuegians groups, however a systematic exploration of food practices across time in relation to possible pre- and post-contact changes is still lacking...
2017: PloS One
https://www.readbyqxmd.com/read/28387361/origin-and-spread-of-human-mitochondrial-dna-haplogroup-u7
#15
Hovhannes Sahakyan, Baharak Hooshiar Kashani, Rakesh Tamang, Alena Kushniarevich, Amirtharaj Francis, Marta D Costa, Ajai Kumar Pathak, Zaruhi Khachatryan, Indu Sharma, Mannis van Oven, Jüri Parik, Hrant Hovhannisyan, Ene Metspalu, Erwan Pennarun, Monika Karmin, Erika Tamm, Kristiina Tambets, Ardeshir Bahmanimehr, Tuuli Reisberg, Maere Reidla, Alessandro Achilli, Anna Olivieri, Francesca Gandini, Ugo A Perego, Nadia Al-Zahery, Massoud Houshmand, Mohammad Hossein Sanati, Pedro Soares, Ekta Rai, Jelena Šarac, Tena Šarić, Varun Sharma, Luisa Pereira, Veronica Fernandes, Viktor Černý, Shirin Farjadian, Deepankar Pratap Singh, Hülya Azakli, Duran Üstek, Natalia Ekomasova Trofimova, Ildus Kutuev, Sergei Litvinov, Marina Bermisheva, Elza K Khusnutdinova, Niraj Rai, Manvendra Singh, Vijay Kumar Singh, Alla G Reddy, Helle-Viivi Tolk, Svjetlana Cvjetan, Lovorka Barac Lauc, Pavao Rudan, Emmanuel N Michalodimitrakis, Nicholas P Anagnou, Kalliopi I Pappa, Maria V Golubenko, Vladimir Orekhov, Svetlana A Borinskaya, Katrin Kaldma, Monica A Schauer, Maya Simionescu, Vladislava Gusar, Elena Grechanina, Periyasamy Govindaraj, Mikhail Voevoda, Larissa Damba, Swarkar Sharma, Lalji Singh, Ornella Semino, Doron M Behar, Levon Yepiskoposyan, Martin B Richards, Mait Metspalu, Toomas Kivisild, Kumarasamy Thangaraj, Phillip Endicott, Gyaneshwer Chaubey, Antonio Torroni, Richard Villems
Human mitochondrial DNA haplogroup U is among the initial maternal founders in Southwest Asia and Europe and one that best indicates matrilineal genetic continuity between late Pleistocene hunter-gatherer groups and present-day populations of Europe. While most haplogroup U subclades are older than 30 thousand years, the comparatively recent coalescence time of the extant variation of haplogroup U7 (~16-19 thousand years ago) suggests that its current distribution is the consequence of more recent dispersal events, despite its wide geographical range across Europe, the Near East and South Asia...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28374451/dental-wear-and-age-grading-at-roonka-south-australia
#16
Judith Littleton
OBJECTIVES: In many hunter-gatherer populations, the teeth are used as a third hand or a tool. Much attention has been paid to wear and its relationship to gendered division of labor, but age is also a significant organizing factor in many societies. In this article, I analyze whether the pattern of wear at Roonka, Australia, reflects the age-graded acquisition of tasks. MATERIALS AND METHODS: The remains analyzed come from Roonka and date from c6000 BP to 150 BP...
April 4, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28366199/favorable-ecological-circumstances-promote-life-expectancy-in-chimpanzees-similar-to-that-of-human-hunter-gatherers
#17
Brian M Wood, David P Watts, John C Mitani, Kevin E Langergraber
Demographic data on wild chimpanzees are crucial for understanding the evolution of chimpanzee and hominin life histories, but most data come from populations affected by disease outbreaks and anthropogenic disturbance. We present survivorship data from a relatively undisturbed and exceptionally large community of eastern chimpanzees (Pan troglodytes schweinfurthii) at Ngogo, Kibale National Park, Uganda. We monitored births, deaths, immigrations, and emigrations in the community between 1995 and 2016. Using known and estimated ages, we calculated survivorship curves for the whole community, for males and females separately, and for individuals ≤2 years old when identified...
April 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28362000/emergence-and-evolution-of-cooperation-under-resource-pressure
#18
María Pereda, Débora Zurro, José I Santos, Ivan Briz I Godino, Myrian Álvarez, Jorge Caro, José M Galán
We study the influence that resource availability has on cooperation in the context of hunter-gatherer societies. This paper proposes a model based on archaeological and ethnographic research on resource stress episodes, which exposes three different cooperative regimes according to the relationship between resource availability in the environment and population size. The most interesting regime represents moderate survival stress in which individuals coordinate in an evolutionary way to increase the probabilities of survival and reduce the risk of failing to meet the minimum needs for survival...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28355257/lithic-technological-responses-to-late-pleistocene-glacial-cycling-at-pinnacle-point-site-5-6-south-africa
#19
Jayne Wilkins, Kyle S Brown, Simen Oestmo, Telmo Pereira, Kathryn L Ranhorn, Benjamin J Schoville, Curtis W Marean
There are multiple hypotheses for human responses to glacial cycling in the Late Pleistocene, including changes in population size, interconnectedness, and mobility. Lithic technological analysis informs us of human responses to environmental change because lithic assemblage characteristics are a reflection of raw material transport, reduction, and discard behaviors that depend on hunter-gatherer social and economic decisions. Pinnacle Point Site 5-6 (PP5-6), Western Cape, South Africa is an ideal locality for examining the influence of glacial cycling on early modern human behaviors because it preserves a long sequence spanning marine isotope stages (MIS) 5, 4, and 3 and is associated with robust records of paleoenvironmental change...
2017: PloS One
https://www.readbyqxmd.com/read/28355249/barley-hordeum-vulgare-in-the-okhotsk-culture-5th-10th-century-ad-of-northern-japan-and-the-role-of-cultivated-plants-in-hunter-gatherer-economies
#20
Christian Leipe, Elena A Sergusheva, Stefanie Müller, Robert N Spengler, Tomasz Goslar, Hirofumi Kato, Mayke Wagner, Andrzej W Weber, Pavel E Tarasov
This paper discusses archaeobotanical remains of naked barley recovered from the Okhotsk cultural layers of the Hamanaka 2 archaeological site on Rebun Island, northern Japan. Calibrated ages (68% confidence interval) of the directly dated barley remains suggest that the crop was used at the site ca. 440-890 cal yr AD. Together with the finds from the Oumu site (north-eastern Hokkaido Island), the recovered seed assemblage marks the oldest well-documented evidence for the use of barley in the Hokkaido Region...
2017: PloS One
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