Enzima única pode explicar sobrevivência dos humanos modernos

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[{"selector":"#anim-31eee19f-c808-4f0b-8747-b60f11d217ee","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-59a7c2cd-bed1-46dd-9462-2cce95bd7dc4","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-53f61803-3d51-472b-816d-4cae86294be7","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-8baf49e0-f1e2-4bff-b77d-22da4795917b","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-67767e99-6d1e-4ff9-ad3b-50e1aae93f7a [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(0, 32.831546146254055%, 0)","translate3d(0, 0%, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] Os humanos modernos são sobreviventes evolutivos, prosperando geração após geração enquanto nossos parentes ancestrais se extinguiram. Agora, uma nova pesquisa sugere que uma enzima exclusiva do Homo sapiens pode nos ter tornado mais eficientes na busca por água Freepick

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[{"selector":"#anim-0bb83a56-abba-42ff-a257-5df06aa8353f","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8e8f69b8-ae56-4a47-8ba6-7a95786d8aa9","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-74793552-62b4-49da-a817-f0312096f9be","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-7c75ae90-f8ef-44d2-80c5-7356ef8d4a0f","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-bf30ce9f-618e-496c-8453-ddb1dfeabf7e [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(7.81630556270486%, 0, 0)","translate3d(0%, 0, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] Na cadeia de 484 aminoácidos da enzima, um aminoácido na posição 429, chamado alanina, foi substituído por valina. É uma pequena mudança, mas produziu uma versão da ADSL que apenas os humanos modernos possuem Freepick

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[{"selector":"#anim-d5aa0d11-9943-402c-a764-40271f3d367e","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d3e34cae-ec45-4651-afb5-f8725e6bfa50","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8211836f-d26a-44e2-af3a-0adbfbc7c28a","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-27f207fd-cd8d-43e4-9b39-e3b7ade16f0c","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Eles testaram esses camundongos "humanizados", junto com um grupo controle de camundongos não alterados, primeiro restringindo gradualmente seu acesso à água por 12 dias e depois disponibilizando água unoL/Geety Images

[{"selector":"#anim-99d743f2-e02a-4672-a4f6-f477be79493b","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0f1298db-4ace-4ee5-8cf9-767162a28e88","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5e32191d-849e-4a25-8c97-a70270e76fe5","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-2d963803-f95f-4dd3-850b-f0500ff44484","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Os cientistas descobriram que camundongos fêmeas com a variante humana da enzima visitavam a área de distribuição de água com mais frequência quando estavam com sede Pixabay

[{"selector":"#anim-47a77b49-938c-46a6-a52e-adb59f9c0a0b","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-21ecfea6-1f87-4b88-a295-a5093bd4e518","keyframes":{"transform":["translate3d(0px, 298.93552%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-670e2ca5-bd38-4818-9d3a-425db01492a6","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8895fc51-da5c-43ff-9454-11aa84600d1d","keyframes":{"transform":["translate3d(0px, 357.62966%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Este estudo levanta possibilidades intrigantes sobre como nossos ancestrais podem ter obtido vantagem sobre contemporâneos como Neandertais e Denisovanos em ambientes instáveis com recursos limitados Maanasa Raghavan, professora assistente de genética humana na Universidade de Chicago

CNNBRASIL.COM.BR

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