Complete Mitochondrial Genomes Reveal Neolithic Expansion into Europe

The Neolithic transition from hunting and gathering to farming and cattle breeding marks one of the most drastic cultural changes in European prehistory. Short stretches of ancient mitochondrial DNA (mtDNA) from skeletons of pre-Neolithic hunter-gatherers as well as early Neolithic farmers support the demic diffusion model where a migration of early farmers from the Near East and a replacement of pre-Neolithic hunter-gatherers are largely responsible for cultural innovation and changes in subsistence strategies during the Neolithic revolution in Europe. In order to test if a signal of population expansion is still present in modern European mitochondrial DNA, we analyzed a comprehensive dataset of 1,151 complete mtDNAs from present-day Europeans. Relying upon ancient DNA data from previous investigations, we identified mtDNA haplogroups that are typical for early farmers and hunter-gatherers, namely H and U respectively. Bayesian skyline coalescence estimates were then used on subsets of complete mtDNAs from modern populations to look for signals of past population expansions. Our analyses revealed a population expansion between 15,000 and 10,000 years before present (YBP) in mtDNAs typical for hunters and gatherers, with a decline between 10,000 and 5,000 YBP. These corresponded to an analogous population increase approximately 9,000 YBP for mtDNAs typical of early farmers. The observed changes over time suggest that the spread of agriculture in Europe involved the expansion of farming populations into Europe followed by the eventual assimilation of resident hunter-gatherers. Our data show that contemporary mtDNA datasets can be used to study ancient population history if only limited ancient genetic data is available

Atendimento multidisciplinar do paciente ortodôntico com epidermólise bolhosa Multidisciplinary management of the orthodontic patient with epidermolysis bullosa

O termo epidermólise bolhosa descreve um grupo variado de doenças hereditárias, crônicas, não inflamatórias, epiteliais e da mucosa, que são caracterizadas por excepcional fragilidade e reduzida resistência após trauma moderado. Esta doença é classificada em forma simples, juncional ou distrófica, com pelo menos 23 subtipos, e é uma doença rara que afeta toda a população, qualquer grupo racial e igualmente homens e mulheres. OBJETIVO: os autores relatam problemas sistêmicos e bucais associados à epidermólise bolhosa, norteando atitudes clínicas multidisciplinares quando o paciente necessita de tratamento ortodôntico.<br>The term epidermolysis bullosa describes a varied group of hereditary, chronic, non-inflammatory diseases of the skin and mucosa, which are characterized by remarkable skin fragility and reduced resistance after moderate trauma. This disease is classified as simple, junctional or dystrophic form, with at least 23 subtypes, and is a rare disease found in all populations and racial groups, equally affecting males and females. AIM: the authors reports systemic and oral problems associated with epidermolysis bullosa, guiding the multidisciplinary clinical attitudes when the patient needs orthodontic treatment