{"id":101047,"date":"2025-12-17T19:44:05","date_gmt":"2025-12-17T17:44:05","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=101047"},"modified":"2025-12-17T19:44:05","modified_gmt":"2025-12-17T17:44:05","slug":"noi-oamenii-provenim-din-luca-o-forma-de-viata-aparuta-in-urma-cu-42-miliarde-de-ani","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/noi-oamenii-provenim-din-luca-o-forma-de-viata-aparuta-in-urma-cu-42-miliarde-de-ani\/","title":{"rendered":"Noi, oamenii, provenim din LUCA &#8211; o form\u0103 de via\u0163\u0103 ap\u0103rut\u0103 \u00een urm\u0103 cu 4,2 miliarde de ani!?"},"content":{"rendered":"<figure id=\"attachment_101048\" aria-describedby=\"caption-attachment-101048\" style=\"width: 350px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/LUCA-viata_1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-101048\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/LUCA-viata_1.jpg\" alt=\"\" width=\"360\" height=\"281\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/LUCA-viata_1.jpg 360w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/LUCA-viata_1-300x234.jpg 300w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><figcaption id=\"caption-attachment-101048\" class=\"wp-caption-text\"><strong>Imagine:<\/strong> generata de <strong>Google Gemini<\/strong><\/figcaption><\/figure>\n<p>Toat\u0103 via\u021ba de pe P\u0103m\u00e2nt poate fi urm\u0103rit\u0103 p\u00e2n\u0103 la un Ultim Str\u0103mo\u0219 Comun Universal (<strong>LUCA<\/strong>). Un studiu sugereaz\u0103 c\u0103 acest organism a tr\u0103it probabil pe P\u0103m\u00e2nt la doar 400 de milioane de ani de la formarea sa. Analize ulterioare arat\u0103, de asemenea, c\u0103 aceast\u0103 form\u0103 de via\u021b\u0103 avea probabil un sistem imunitar timpuriu, ceea ce \u00eenseamn\u0103 c\u0103 probabil lupta \u00eempotriva viru\u0219ilor.<\/p>\n<p>Via\u021ba pe P\u0103m\u00e2nt a trebuit s\u0103 \u00eenceap\u0103 de undeva, iar oamenii de \u0219tiin\u021b\u0103 cred c\u0103 acel &#8222;undeva&#8221; este LUCA &#8211; sau Ultimul Str\u0103mo\u0219 Comun Universal. Acest organism asem\u0103n\u0103tor procariotelor reprezint\u0103 str\u0103mo\u0219ul oric\u0103rei fiin\u021be vii, de la cea mai mic\u0103 bacterie p\u00e2n\u0103 la cea mai mare balen\u0103 albastr\u0103. De\u0219i Explozia Cambrian\u0103 a dat startul vie\u021bii complexe \u00eentr-un mod major, acum aproximativ 530 de milioane de ani, adev\u0103rata cronologie a vie\u021bii pe P\u0103m\u00e2nt este mult mai lung\u0103. Ani de zile, oamenii de \u0219tiin\u021b\u0103 au estimat c\u0103 LUCA a ap\u0103rut probabil \u00een urm\u0103 cu aproximativ 4 miliarde de ani, adic\u0103 la doar 600 de milioane de ani de la formarea planetei.<\/p>\n<p>\u00cens\u0103 un studiu realizat de o echip\u0103 interna\u021bional\u0103 de oameni de \u0219tiin\u021b\u0103 extinde aceast\u0103 cronologie \u0219i mai departe, p\u00e2n\u0103 la aproximativ 4,2 miliarde de ani \u00een urm\u0103, descoperind totodat\u0103 c\u00e2teva detalii fascinante despre cum ar fi putut fi via\u021ba pe LUCA. Rezultatele studiului au fost publicate \u00een revista <strong><em>&#8222;Nature Ecology &amp; Evolution&#8221;<\/em><\/strong>.<\/p>\n<p>\u00cen lucrare se spune: <em>&#8222;Str\u0103mo\u0219ul comun al \u00eentregii vie\u021bi celulare existente este eviden\u021biat de codul genetic universal, mecanismul de sintez\u0103 a proteinelor, chiralitatea comun\u0103 a setului aproape universal de 20 de aminoacizi \u0219i utilizarea ATP-ului ca moned\u0103 energetic\u0103 comun\u0103. Ca atare, \u00een\u021belegerea noastr\u0103 despre LUCA are impact asupra \u00een\u021belegerii noastre despre evolu\u021bia timpurie a vie\u021bii pe P\u0103m\u00e2nt. A fost LUCA un organism simplu sau complex? \u00cen ce fel de mediu a locuit \u0219i c\u00e2nd?&#8221;<\/em><\/p>\n<p>Pentru a stabili exact c\u00e2nd a ap\u0103rut LUCA pe P\u0103m\u00e2nt, oamenii de \u0219tiin\u021b\u0103 au trebuit s\u0103 lucreze \u00een sens invers. Mai \u00eent\u00e2i, echipa a comparat genele speciilor vii \u0219i a num\u0103rat muta\u021biile care au avut loc de c\u00e2nd au \u00eemp\u0103rt\u0103\u0219it un str\u0103mo\u0219 comun cu LUCA. Folosind o ecua\u021bie genetic\u0103 bazat\u0103 pe timpul separ\u0103rii dintre specii, echipa a calculat c\u0103 LUCA trebuie s\u0103 fi existat pe P\u0103m\u00e2nt \u00eenc\u0103 de la 400 de milioane de ani de la crearea sa, ceea ce plaseaz\u0103 acest organism chiar \u00een mijlocul co\u0219marului geologic infernal cunoscut sub numele de Eonul Hadean.<\/p>\n<p>De\u0219i LUCA este cel mai vechi str\u0103mo\u0219 comun pe care \u00eel cunoa\u0219tem, oamenii de \u0219tiin\u021b\u0103 \u00eenc\u0103 nu \u00een\u021beleg cum a evoluat via\u021ba de la originile sale p\u00e2n\u0103 la comunit\u0103\u021bile timpurii din care face parte LUCA. Studiile suplimentare vor trebui s\u0103 aprofundeze aceast\u0103 istorie primordial\u0103 \u0219i s\u0103 descopere exact cum am ajuns s\u0103 apar\u0103 omul din LUCA.<\/p>\n<p><strong>Sursa:<\/strong> studiul \u015ftiin\u0163ific <a href=\"https:\/\/www.nature.com\/articles\/s41559-024-02461-1\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;The nature of the last universal common ancestor and its impact on the early Earth system&#8221; \/ nature.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Toat\u0103 via\u021ba de pe P\u0103m\u00e2nt poate fi urm\u0103rit\u0103 p\u00e2n\u0103 la un Ultim Str\u0103mo\u0219 Comun Universal (LUCA). Un studiu sugereaz\u0103 c\u0103 acest organism a tr\u0103it probabil pe P\u0103m\u00e2nt la doar 400 de milioane de ani de la formarea sa. Analize ulterioare &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Noi, oamenii, provenim din LUCA &#8211; o form\u0103 de via\u0163\u0103 ap\u0103rut\u0103 \u00een urm\u0103 cu 4,2 miliarde de ani!?\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/noi-oamenii-provenim-din-luca-o-forma-de-viata-aparuta-in-urma-cu-42-miliarde-de-ani\/#more-101047\" aria-label=\"Cite\u0219te mai multe despre Noi, oamenii, provenim din LUCA &#8211; o form\u0103 de via\u0163\u0103 ap\u0103rut\u0103 \u00een urm\u0103 cu 4,2 miliarde de ani!?\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":101048,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[1733,1521,3711,5185,9800,105,20010,2364,366,5841],"class_list":["post-101047","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-natura-animale","tag-bacterie","tag-balena","tag-gene","tag-luca","tag-natura-animale","tag-pamant","tag-procariote","tag-revista","tag-viata","tag-virusi","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Noi, oamenii, provenim din LUCA - o form\u0103 de via\u0163\u0103 ap\u0103rut\u0103 \u00een urm\u0103 cu 4,2 miliarde de ani!? - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/noi-oamenii-provenim-din-luca-o-forma-de-viata-aparuta-in-urma-cu-42-miliarde-de-ani\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Noi, oamenii, provenim din LUCA - o form\u0103 de via\u0163\u0103 ap\u0103rut\u0103 \u00een urm\u0103 cu 4,2 miliarde de ani!?\" \/>\n<meta property=\"og:description\" content=\"Toat\u0103 via\u021ba de pe P\u0103m\u00e2nt poate fi urm\u0103rit\u0103 p\u00e2n\u0103 la un Ultim Str\u0103mo\u0219 Comun Universal (LUCA). 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