Efeito da simbiose com fungos sobre genes do metabolismo de amido e de alguns aminoácidos na formiga Mycocepurus goeldii
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Data
2016-08-04
Autores
Silva, Dayane Pires da [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Relações de simbiose com micro-organismos são descritas como uma forma de inovação evolutiva que permite a alguns animais acesso aos nutrientes que de outra forma não estariam disponíveis. As formigas da tribo Attini são conhecidas pelo hábito de cultivar fungos que lhes fornecem nutrientes. Parte destes nutrientes são obtidos quando o fungo fornece enzimas que são instáveis ou mesmo ausentes nas formigas. No presente trabalho nós mostramos que as formigas Attini apresentam amilases submetidas a uma baixa pressão seletiva e grande quantidade de substituições de aminoácidos potencialmente deletérias. Esses dados reforçam a hipótese de que a função da amilase das formigas foi substituída pela amilase fúngica. Nós também demonstramos que, tal como ocorre com as Attini derivadas, a Attini basal Mycocepurus goeldii é deficiente em duas enzimas da via de síntese de arginina, a argininossuccinato liase e a argininossuccinato sintase. Esses dados indicam que a complementação pelo fungo de deficiências enzimáticas das formigas é um evento ancestral na história evolutiva das Attini.
Symbiotic relationships with microorganisms are described as a form of evolutionary innovation that allows some animals access to nutrients which otherwise would not be available. The Attine ants are known for the habit of cultivating fungi which provide them with nutrients. Some of these nutrients are obtained when the fungus provides enzymes that are unstable or even absent in ants. In this work we show that the Attini ants presents amylases subjected a low selective pressure and a large amount of potentially harmful amino acid substitutions. These data corroborates the hypothesis that the function of amylase of ants was replaced by fungal amylase. We also demonstrate that, just as with derived Attine, in the basal Attine Mycocepurus goeldii two enzymes is deficient in arginine synthetic pathway, the argininosuccinate lyase and argininosuccinate synthase. These data indicate that supplementation of deficient enzymes in ants made by fungal is an ancient event in the evolutionary history of Attine.
Symbiotic relationships with microorganisms are described as a form of evolutionary innovation that allows some animals access to nutrients which otherwise would not be available. The Attine ants are known for the habit of cultivating fungi which provide them with nutrients. Some of these nutrients are obtained when the fungus provides enzymes that are unstable or even absent in ants. In this work we show that the Attini ants presents amylases subjected a low selective pressure and a large amount of potentially harmful amino acid substitutions. These data corroborates the hypothesis that the function of amylase of ants was replaced by fungal amylase. We also demonstrate that, just as with derived Attine, in the basal Attine Mycocepurus goeldii two enzymes is deficient in arginine synthetic pathway, the argininosuccinate lyase and argininosuccinate synthase. These data indicate that supplementation of deficient enzymes in ants made by fungal is an ancient event in the evolutionary history of Attine.
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Palavras-chave
Formiga, Tribo Attini, Sequenciamento de nova geração, Transcriptoma, Vias metabólicas