Cientistas descobrem protista com código genético incomum

Pesquisadores do Earlham Institute identificaram uma espécie de protista anteriormente desconhecida que reatribui dois códons de parada genéticos para codificar aminoácidos, marcando um raro desvio das regras padrão da vida.

O organismo, chamado Oligohymenophorea sp. PL0344, foi coletado em um lago de água doce no Oxford University Parks durante um teste de rotina de um método de sequenciamento de DNA de célula única. O Dr. Jamie McGowan, cientista pós-doutorando que liderou o trabalho, descreveu a descoberta como um acaso que revelou o quão pouco se sabe sobre a genética dos protistas. Neste ciliado, os códons TAA e TAG não sinalizam mais o fim de um gene, mas especificam lisina e ácido glutâmico, respectivamente, enquanto apenas o TGA funciona como um sinal de parada.

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