{"id":3376,"date":"2023-07-29T14:42:58","date_gmt":"2023-07-29T14:42:58","guid":{"rendered":"https:\/\/dailyai.com\/?p=3376"},"modified":"2023-07-31T09:16:54","modified_gmt":"2023-07-31T09:16:54","slug":"researchers-use-machine-learning-to-resurrect-ancient-molecules","status":"publish","type":"post","link":"https:\/\/dailyai.com\/pt\/2023\/07\/researchers-use-machine-learning-to-resurrect-ancient-molecules\/","title":{"rendered":"Os investigadores utilizam a aprendizagem autom\u00e1tica para \"ressuscitar\" mol\u00e9culas antigas"},"content":{"rendered":"<p><b>Uma equipa de bioengenheiros utilizou com sucesso a IA para ressuscitar mol\u00e9culas do nosso passado antigo.\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Este estudo intrigante utilizou a aprendizagem autom\u00e1tica (ML) para analisar dados de prote\u00ednas de humanos modernos (<\/span><i><span style=\"font-weight: 400;\">Homo sapiens<\/span><\/i><span style=\"font-weight: 400;\">), bem como dos nossos parentes extintos, os Neandertais (<\/span><i><span style=\"font-weight: 400;\">Homo neanderthalensis<\/span><\/i><span style=\"font-weight: 400;\">) e os Denisovans, uma esp\u00e9cie ou subesp\u00e9cie extinta de humanos da \u00c1sia.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">O <\/span><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S1931312823002962?via%3Dihub\"><span style=\"font-weight: 400;\">estudo<\/span><\/a><span style=\"font-weight: 400;\"> descobriram mol\u00e9culas com potencial para combater bact\u00e9rias causadoras de doen\u00e7as. Estas t\u00e9cnicas, designadas por \"de-extin\u00e7\u00e3o\", poder\u00e3o servir de base para a localiza\u00e7\u00e3o de novos antibi\u00f3ticos.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\"Estamos motivados pela no\u00e7\u00e3o de trazer de volta mol\u00e9culas do passado para resolver problemas que temos atualmente\", Cesar de la Fuente, coautor do estudo e bioengenheiro da Universidade da Pensilv\u00e2nia, em Filad\u00e9lfia, <\/span><a href=\"https:\/\/www.nature.com\/articles\/d41586-023-02403-0\"><span style=\"font-weight: 400;\">disse \u00e0 Nature<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p>Se isto o faz pensar numa certa franquia de filmes baseados em dinossauros <span style=\"font-weight: 400;\">-<\/span> foi precisamente isso que inspirou a equipa de investiga\u00e7\u00e3o.<\/p>\n<p>De la Fuente disse: \"Come\u00e7\u00e1mos a pensar em\u00a0<i>Parque Jur\u00e1ssico<\/i>\", diz ele. Em vez de trazer os dinossauros de volta \u00e0 vida, como os cientistas fizeram no filme de 1993, a equipa teve uma ideia mais vi\u00e1vel: \"Porque n\u00e3o trazer de volta as mol\u00e9culas?<\/p>\n<p><span style=\"font-weight: 400;\">A press\u00e3o exercida sobre os investigadores para encontrarem novos antibi\u00f3ticos \u00e9 enorme, uma vez que nos \u00faltimos 30 anos foram descobertos poucos medicamentos eficazes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> Entretanto, a preval\u00eancia de bact\u00e9rias resistentes aos antibi\u00f3ticos est\u00e1 a aumentar, pelo que s\u00e3o bem-vindos novos tratamentos. <\/span><span style=\"font-weight: 400;\">A IA fornece <a href=\"https:\/\/dailyai.com\/pt\/2023\/05\/ai-helps-researchers-discover-a-new-antibiotic-for-treating-drug-resistant-bacteria\/\">numerosas vias<\/a> para explorar esses novos tratamentos, com uma s\u00e9rie de estudos que tiram partido da tecnologia para descobrir mol\u00e9culas ocultas e desconhecidas clinicamente relevantes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Muitos organismos geram subunidades proteicas curtas, conhecidas como p\u00e9ptidos, com propriedades antimicrobianas. V\u00e1rios p\u00e9ptidos antimicrobianos, predominantemente provenientes de bact\u00e9rias, s\u00e3o utilizados para tratar infec\u00e7\u00f5es.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As prote\u00ednas de esp\u00e9cies extintas - incluindo os seres humanos - podem servir como um recurso valioso, mas pouco explorado, para o desenvolvimento de novos antibi\u00f3ticos.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Os investigadores treinaram um algoritmo de aprendizagem de m\u00e1quina para identificar os locais nas prote\u00ednas humanas onde estas s\u00e3o divididas em p\u00e9ptidos. Aplicaram este algoritmo a sequ\u00eancias de prote\u00ednas publicamente dispon\u00edveis de <\/span><i><span style=\"font-weight: 400;\">H. sapiens, H. neanderthalensis<\/span><\/i><span style=\"font-weight: 400;\">e Denisovans, identificando novos p\u00e9ptidos com base nas caracter\u00edsticas de p\u00e9ptidos antimicrobianos conhecidos.\u00a0<\/span><\/p>\n<figure id=\"attachment_3377\" aria-describedby=\"caption-attachment-3377\" style=\"width: 729px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3377\" src=\"https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg.jpg\" alt=\"Desextin\u00e7\u00e3o da IA\" width=\"729\" height=\"729\" srcset=\"https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg.jpg 996w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-300x300.jpg 300w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-150x150.jpg 150w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-768x768.jpg 768w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-180x180.jpg 180w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-90x90.jpg 90w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-370x370.jpg 370w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-800x800.jpg 800w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-20x20.jpg 20w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-740x740.jpg 740w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-24x24.jpg 24w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-48x48.jpg 48w, https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/1-s2.0-S1931312823002962-fx1_lrg-96x96.jpg 96w\" sizes=\"auto, (max-width: 729px) 100vw, 729px\" \/><figcaption id=\"caption-attachment-3377\" class=\"wp-caption-text\">A \"de-extin\u00e7\u00e3o\" molecular com a IA. Fonte: <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S1931312823002962?via%3Dihub\">Desextin\u00e7\u00e3o molecular de p\u00e9ptidos antimicrobianos antigos possibilitada pela aprendizagem autom\u00e1tica<\/a>.<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">S\u00e3o necess\u00e1rias apenas algumas semanas para identificar e testar potenciais candidatos a medicamentos utilizando a IA, em compara\u00e7\u00e3o com o processo tradicional que demora entre 3 a 6 meses para descobrir um novo antibi\u00f3tico.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A equipa testou uma variedade de p\u00e9ptidos em laborat\u00f3rio para explorar a sua capacidade de eliminar bact\u00e9rias. Seleccionaram 6 p\u00e9ptidos potentes - 4 de <\/span><i><span style=\"font-weight: 400;\">H. sapiens<\/span><\/i><span style=\"font-weight: 400;\">, 1 de <\/span><i><span style=\"font-weight: 400;\">H. neanderthalensis<\/span><\/i><span style=\"font-weight: 400;\">e 1 de Denisovans. Os p\u00e9ptidos foram testados em ratinhos infectados com <\/span><i><span style=\"font-weight: 400;\">Acinetobacter baumannii<\/span><\/i><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Embora nenhum dos pept\u00eddeos tenha matado completamente as bact\u00e9rias, todos eles conseguiram inibir o crescimento de <\/span><i><span style=\"font-weight: 400;\">A. baumannii <\/span><\/i><span style=\"font-weight: 400;\">no tecido muscular da coxa. 5 mol\u00e9culas mataram bact\u00e9rias em abcessos cut\u00e2neos, embora fossem necess\u00e1rias doses elevadas.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\"Embora o algoritmo que utiliz\u00e1mos n\u00e3o tenha produzido mol\u00e9culas fant\u00e1sticas, penso que o conceito e a estrutura representam uma via totalmente nova para pensar na descoberta de medicamentos\", afirma de la Fuente.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Euan Ashley, especialista em gen\u00f3mica e sa\u00fade de precis\u00e3o da Universidade de Stanford, comentou: \"De la Fuente e os seus colegas persuadiram-me de que mergulhar no genoma humano arcaico era uma abordagem interessante e potencialmente \u00fatil\".<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Como funcionou o estudo: resumo<\/span><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Os investigadores propuseram-se ressuscitar (ou \"de-extin\u00e7\u00e3o\") mol\u00e9culas bioactivas que j\u00e1 n\u00e3o s\u00e3o produzidas por organismos vivos. Estas mol\u00e9culas poderiam ser utilizadas para a descoberta de medicamentos.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Utilizaram um modelo de aprendizagem autom\u00e1tica (ML) conhecido como panCleave. Trata-se de um modelo de \"floresta aleat\u00f3ria\", um tipo de algoritmo de IA que prev\u00ea resultados com base em muitos dados. O modelo panCleave previu onde as prote\u00ednas seriam divididas em partes mais pequenas, conhecidas como p\u00e9ptidos. Estes p\u00e9ptidos t\u00eam, por vezes, propriedades antimicrobianas.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">O resultado: Os investigadores encontraram v\u00e1rios p\u00e9ptidos (tanto de humanos modernos como de parentes humanos extintos) que mostraram potencial como agentes antimicrobianos quando testados em laborat\u00f3rio.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Os testes inclu\u00edram a resist\u00eancia a ser quebrada por outras prote\u00ednas e a capacidade de permear as membranas celulares. Alguns dos p\u00e9ptidos combateram eficazmente uma infe\u00e7\u00e3o bacteriana comum em abcessos cut\u00e2neos de ratinhos.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Os m\u00e9todos de aprendizagem autom\u00e1tica podem identificar p\u00e9ptidos promissores para o desenvolvimento de novos antibi\u00f3ticos. Al\u00e9m disso, a \"de-extin\u00e7\u00e3o molecular\" (ressuscitar mol\u00e9culas de organismos extintos) \u00e9 proposta como um novo quadro para a descoberta de medicamentos, especificamente para encontrar novos antibi\u00f3ticos.<\/span><\/li>\n<\/ul>\n<p>O potencial da IA para a descoberta de novos medicamentos \u00e0 escala est\u00e1 a revelar-se imenso, e n\u00e3o apenas para os antibi\u00f3ticos, mas <a href=\"https:\/\/dailyai.com\/pt\/2023\/07\/ai-accelerates-discovery-of-anti-aging-drugs-in-new-study\/\">medicamentos anti-envelhecimento e outros compostos<\/a>\u00a0tamb\u00e9m.<\/p>","protected":false},"excerpt":{"rendered":"<p>Uma equipa de bioengenheiros utilizou com sucesso a IA para ressuscitar mol\u00e9culas do nosso passado antigo.  Este estudo intrigante utilizou a aprendizagem autom\u00e1tica (ML) para analisar dados de prote\u00ednas de humanos modernos (Homo sapiens), bem como dos nossos parentes extintos, os Neandertais (Homo neanderthalensis) e os Denisovans, uma esp\u00e9cie ou subesp\u00e9cie extinta de humanos da \u00c1sia.  O estudo descobriu mol\u00e9culas com potencial para combater bact\u00e9rias causadoras de doen\u00e7as. Estas t\u00e9cnicas, designadas por \"de-extin\u00e7\u00e3o\", podem servir de base para a localiza\u00e7\u00e3o de novos antibi\u00f3ticos. \"Estamos motivados pela no\u00e7\u00e3o de trazer de volta mol\u00e9culas do passado para resolver problemas que temos atualmente\", Cesar de la Fuente,<\/p>","protected":false},"author":2,"featured_media":3378,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[259,203,260,178,101],"class_list":["post-3376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-antibiotics","tag-biotech","tag-drug-discovery","tag-medicine","tag-medtech"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Researchers use machine learning to &#039;resurrect&#039; ancient molecules | DailyAI<\/title>\n<meta name=\"description\" content=\"A team of bioengineers has successfully utilized AI to resurrect molecules from our ancient past.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dailyai.com\/pt\/2023\/07\/researchers-use-machine-learning-to-resurrect-ancient-molecules\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Researchers use machine learning to &#039;resurrect&#039; ancient molecules | DailyAI\" \/>\n<meta property=\"og:description\" content=\"A team of bioengineers has successfully utilized AI to resurrect molecules from our ancient past.\u00a0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dailyai.com\/pt\/2023\/07\/researchers-use-machine-learning-to-resurrect-ancient-molecules\/\" \/>\n<meta property=\"og:site_name\" content=\"DailyAI\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-29T14:42:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-31T09:16:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dailyai.com\/wp-content\/uploads\/2023\/07\/shutterstock_1444962308.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"614\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sam Jeans\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DailyAIOfficial\" \/>\n<meta name=\"twitter:site\" content=\"@DailyAIOfficial\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sam Jeans\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\\\/\\\/dailyai.com\\\/2023\\\/07\\\/researchers-use-machine-learning-to-resurrect-ancient-molecules\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/dailyai.com\\\/2023\\\/07\\\/researchers-use-machine-learning-to-resurrect-ancient-molecules\\\/\"},\"author\":{\"name\":\"Sam Jeans\",\"@id\":\"https:\\\/\\\/dailyai.com\\\/#\\\/schema\\\/person\\\/711e81f945549438e8bbc579efdeb3c9\"},\"headline\":\"Researchers use machine learning to &#8216;resurrect&#8217; 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