RESUMO
The Bronze Age of Eurasia (around 3000-1000 BC) was a period of major cultural changes. However, there is debate about whether these changes resulted from the circulation of ideas or from human migrations, potentially also facilitating the spread of languages and certain phenotypic traits. We investigated this by using new, improved methods to sequence low-coverage genomes from 101 ancient humans from across Eurasia. We show that the Bronze Age was a highly dynamic period involving large-scale population migrations and replacements, responsible for shaping major parts of present-day demographic structure in both Europe and Asia. Our findings are consistent with the hypothesized spread of Indo-European languages during the Early Bronze Age. We also demonstrate that light skin pigmentation in Europeans was already present at high frequency in the Bronze Age, but not lactose tolerance, indicating a more recent onset of positive selection on lactose tolerance than previously thought.
Assuntos
Povo Asiático/genética , Evolução Cultural/história , Fósseis , Genoma Humano/genética , Genômica , Idioma/história , População Branca/genética , Arqueologia/métodos , Ásia/etnologia , DNA/genética , DNA/isolamento & purificação , Europa (Continente)/etnologia , Frequência do Gene/genética , Genética Populacional , História Antiga , Migração Humana/história , Humanos , Intolerância à Lactose/genética , Polimorfismo de Nucleotídeo Único/genética , Pigmentação da Pele/genéticaRESUMO
Flattening and lowering of the skull base in response to improper bone growth is called platybasis, and is considered a sensitive and reliable indicator of adverse living conditions such as malnutrition and disease during the prenatal period and early childhood. The degree of platybasis was assessed in three series of skulls representing geographically distinct historical native populations from Europe, Australia and Africa. Platybasis was determined by measuring the height of the base of the skull. The degree of platybasis varied among the populations examined, and was the lowest in the Australian group, and the highest in the African group. This may be due to either variability of living conditions or genetic factors, which have an influence on robusticity and cranial architecture. There were also differences among the groups in terms of the other skull measurements and indices examined. The height of the base of the skull was generally greater in males than in females, which indicates sexual dimorphism or fact that females had worse living conditions. Correlation coefficients between the height of the base of the skull and other measurements including skull length and skull width were also calculated indicating significant relationships. The differences between the height of the base of the skull and height/length index and height/width index, were statistically significant.
Assuntos
Fósseis , Paleontologia , Qualidade de Vida , Base do Crânio/anatomia & histologia , África , Austrália , Europa (Continente) , Feminino , História Antiga , Humanos , Masculino , Caracteres SexuaisRESUMO
The study examined the relationship between marital status and the body mass index (BMI) and the prevalence of overweight and obesity in the Polish population. The sample included 2,266 men and 4,122 women, 25-60 years of age, who were occupationally active inhabitants of Wroclaw, in southwestern Poland. Marital status was defined by two categories: never married and presently married, and two groups in each category were established on the basis of educational level: well-educated (12 or more years in school) and poorly educated (less than 12 years in school). The subjects were also divided into four age groups: 25-30, 31-40, 41-50, and 51-60 years. Height and weight were measured and the BMI was calculated. Three categories of the BMI were established: normal, BMI < 25.0 kg/m(2), overweight, BMI > or = 25 < 30 kg/m(2), and obese, BMI > or = 30 kg/m(2). In each age and educational group, married individuals had a higher BMI than those who were never married. With the exception of well-educated males 51-60 years, differences in the BMI between married and never married individuals increased with age. In general, married men and women were more likely to be overweight and obese than never married individuals. The results indicated a significant association (P < 0.001) between marital status and the BMI in both sexes. After age, marital status was the most important predictor of overweight/obesity among men (P < 0.001), whereas educational level did not have a significant role. Among women, age, marital status, and education were significantly (P < 0.001) related to the BMI.