RESUMO
It has been shown that Neanderthals contributed genetically to modern humans outside Africa 47,000-65,000 years ago. Here we analyse the genomes of a Neanderthal and a Denisovan from the Altai Mountains in Siberia together with the sequences of chromosome 21 of two Neanderthals from Spain and Croatia. We find that a population that diverged early from other modern humans in Africa contributed genetically to the ancestors of Neanderthals from the Altai Mountains roughly 100,000 years ago. By contrast, we do not detect such a genetic contribution in the Denisovan or the two European Neanderthals. We conclude that in addition to later interbreeding events, the ancestors of Neanderthals from the Altai Mountains and early modern humans met and interbred, possibly in the Near East, many thousands of years earlier than previously thought.
Assuntos
Fluxo Gênico/genética , Homem de Neandertal/genética , Altitude , Animais , Teorema de Bayes , Cromossomos Humanos Par 21/genética , Croácia/etnologia , Genoma Humano/genética , Genômica , Haplótipos/genética , Heterozigoto , Humanos , Hibridização Genética/genética , Filogenia , Densidade Demográfica , Sibéria , Espanha/etnologia , Fatores de TempoRESUMO
We present the DNA sequence of 17,367 protein-coding genes in two Neandertals from Spain and Croatia and analyze them together with the genome sequence recently determined from a Neandertal from southern Siberia. Comparisons with present-day humans from Africa, Europe, and Asia reveal that genetic diversity among Neandertals was remarkably low, and that they carried a higher proportion of amino acid-changing (nonsynonymous) alleles inferred to alter protein structure or function than present-day humans. Thus, Neandertals across Eurasia had a smaller long-term effective population than present-day humans. We also identify amino acid substitutions in Neandertals and present-day humans that may underlie phenotypic differences between the two groups. We find that genes involved in skeletal morphology have changed more in the lineage leading to Neandertals than in the ancestral lineage common to archaic and modern humans, whereas genes involved in behavior and pigmentation have changed more on the modern human lineage.
Assuntos
Exoma , Variação Genética , Homem de Neandertal/genética , Substituição de Aminoácidos , Animais , Croácia , DNA/genética , Frequência do Gene , Humanos , Paleontologia , Filogenia , Polimorfismo de Nucleotídeo Único , Sibéria , EspanhaRESUMO
Recent finds of 36 ceramic artifacts from the archaeological site of Vela Spila, Croatia, offer the first evidence of ceramic figurative art in late Upper Palaeolithic Europe, c. 17,500-15,000 years before present (BP). The size and diversity of this artistic ceramic assemblage indicate the emergence of a social tradition, rather than more ephemeral experimentation with a new material. Vela Spila ceramics offer compelling technological and stylistic comparisons with the only other evidence of a developed Palaeolithic ceramic tradition found at the sites of Pavlov I and Dolní Vestonice I, in the Czech Republic, c. 31,000-27,000 cal BP. Because of the 10,000-year gap between the two assemblages, the Vela Spila ceramics are interpreted as evidence of an independent invention of this technology. Consequently, these artifacts provide evidence of a new social context in which ceramics developed and were used to make art in the Upper Palaeolithic.
Assuntos
Arqueologia , Cerâmica , Cultura , Croácia , História Antiga , HumanosRESUMO
Neandertals, the closest evolutionary relatives of present-day humans, lived in large parts of Europe and western Asia before disappearing 30,000 years ago. We present a draft sequence of the Neandertal genome composed of more than 4 billion nucleotides from three individuals. Comparisons of the Neandertal genome to the genomes of five present-day humans from different parts of the world identify a number of genomic regions that may have been affected by positive selection in ancestral modern humans, including genes involved in metabolism and in cognitive and skeletal development. We show that Neandertals shared more genetic variants with present-day humans in Eurasia than with present-day humans in sub-Saharan Africa, suggesting that gene flow from Neandertals into the ancestors of non-Africans occurred before the divergence of Eurasian groups from each other.
Assuntos
Fósseis , Genoma Humano , Genoma , Hominidae/genética , Análise de Sequência de DNA , Animais , Povo Asiático/genética , Sequência de Bases , População Negra/genética , Osso e Ossos , DNA Mitocondrial/genética , Evolução Molecular , Extinção Biológica , Feminino , Dosagem de Genes , Fluxo Gênico , Variação Genética , Haplótipos , Humanos , Pan troglodytes/genética , Polimorfismo de Nucleotídeo Único , Seleção Genética , Alinhamento de Sequência , Tempo , População Branca/genéticaRESUMO
Analysis of Neandertal DNA holds great potential for investigating the population history of this group of hominins, but progress has been limited due to the rarity of samples and damaged state of the DNA. We present a method of targeted ancient DNA sequence retrieval that greatly reduces sample destruction and sequencing demands and use this method to reconstruct the complete mitochondrial DNA (mtDNA) genomes of five Neandertals from across their geographic range. We find that mtDNA genetic diversity in Neandertals that lived 38,000 to 70,000 years ago was approximately one-third of that in contemporary modern humans. Together with analyses of mtDNA protein evolution, these data suggest that the long-term effective population size of Neandertals was smaller than that of modern humans and extant great apes.
Assuntos
DNA Mitocondrial/genética , Fósseis , Genoma Mitocondrial , Hominidae/genética , Análise de Sequência de DNA , Animais , Teorema de Bayes , Primers do DNA , DNA Mitocondrial/análise , DNA Mitocondrial/isolamento & purificação , Evolução Molecular , Feminino , Biblioteca Gênica , Variação Genética , Genoma Humano , Geografia , Humanos , Masculino , Dados de Sequência Molecular , Filogenia , Densidade DemográficaRESUMO
A complete mitochondrial (mt) genome sequence was reconstructed from a 38,000 year-old Neandertal individual with 8341 mtDNA sequences identified among 4.8 Gb of DNA generated from approximately 0.3 g of bone. Analysis of the assembled sequence unequivocally establishes that the Neandertal mtDNA falls outside the variation of extant human mtDNAs, and allows an estimate of the divergence date between the two mtDNA lineages of 660,000 +/- 140,000 years. Of the 13 proteins encoded in the mtDNA, subunit 2 of cytochrome c oxidase of the mitochondrial electron transport chain has experienced the largest number of amino acid substitutions in human ancestors since the separation from Neandertals. There is evidence that purifying selection in the Neandertal mtDNA was reduced compared with other primate lineages, suggesting that the effective population size of Neandertals was small.
Assuntos
Evolução Molecular , Fósseis , Hominidae/genética , Análise de Sequência de DNA/métodos , Animais , Sequência de Bases , Osso e Ossos/metabolismo , Croácia , Ciclo-Oxigenase 2/química , DNA Mitocondrial/genética , Genoma Mitocondrial , Humanos , Modelos Moleculares , Dados de Sequência MolecularRESUMO
Vindija cave in Croatia has yielded the youngest securely dated Neandertal skeletal remains in Central/Eastern Europe. In addition, these remains have been found in association with archaeological material exhibiting Upper Paleolithic elements. Due to its geographic location and date, the Vindija remains are particularly crucial for the understanding of initial modern human peopling of Europe and the nature of the Neandertal demise. The significance of archaeological and paleontological finds and hominin fossils from this site is discussed in the light of new finds at Vindija and recent developments in the fields of paleoanthropology and prehistoric archaeology. Furthermore, the impact of revised chronology for several crucial specimens and sites throughout Europe, including Vindija, is discussed.
