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Genoma do homem de Neanderthal é desvendado

Pesquisadores na Alemanha dizem que fizeram pela primeira vez um mapa do DNA de um Neanderthal, tido como um parente próximo do homem moderno na evolução das espécies.

Os cientistas esperam que a descoberta possa levar a mais revelações de como o homem moderno evoluiu.

“Pela primeira vez, nós construimos uma seqüência de um DNA antigo que é essencialmente sem erro”, disse Richard Green do Instituto Max-Planck para Antropologia Evolucionária, na Alemanha.

O material genético analisado – DNA mitocondrial – foi retirado de um osso de 38 mil anos encontrado em uma caverna na Croácia.

Este tipo de DNA é encontrado fora do núcleo, na mitocôndria, onde a célula gera energia. Como as células podem conter milhares de mitocôndrias, o DNA mitocondrial é mais abundante do que o DNA nuclear e pode ser encontrado em cabelos e em fragmentos de ossos antigos.

Adaptabilidade

A seqüência obtida na Alemanha revelou que o homem de Neanderthal teve menos mudanças evolucionárias do que o homem moderno, tornando-o menos adaptável e precipitando seu desaparecimento.

Acredita-se que o Neanderthal e o homem surgiram de um ancestral comum há mais de 660 mil anos.

Estudos anteriores sugeriram que humanos e Neanderthais não procriaram entre si e os cientistas alemães acreditam que a seqüência genética obtida agora confirma esta teoria.

A relação exata entre homem e o Neanderthal nunca ficou muito clara. Os pesquisadores esperam que diferenças significativas entre os genes de ambos possam indicar o caminho para descobrir o que torna os seres humanos únicos em relação aos outros primatas.

A pesquisa alemã foi divulgada na revista Cell.

Fonte: BBC Brasil




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