{"id":9620,"date":"2025-12-12T10:41:21","date_gmt":"2025-12-12T10:41:21","guid":{"rendered":"https:\/\/info-eforie.ro\/index.php\/2025\/12\/12\/ursii-polari-isi-modifica-adn-ul-pentru-a-se-adapta-la-incalzirea-globala-descoperirea-facuta-in-groenlanda\/"},"modified":"2025-12-12T10:41:21","modified_gmt":"2025-12-12T10:41:21","slug":"ursii-polari-isi-modifica-adn-ul-pentru-a-se-adapta-la-incalzirea-globala-descoperirea-facuta-in-groenlanda","status":"publish","type":"post","link":"https:\/\/info-eforie.ro\/index.php\/2025\/12\/12\/ursii-polari-isi-modifica-adn-ul-pentru-a-se-adapta-la-incalzirea-globala-descoperirea-facuta-in-groenlanda\/","title":{"rendered":"Ur\u0219ii polari \u00ee\u0219i modific\u0103 ADN-ul pentru a se adapta la \u00eenc\u0103lzirea global\u0103. Descoperirea f\u0103cut\u0103 \u00een Groenlanda"},"content":{"rendered":"<div>\n<p>Oamenii de \u0219tiin\u021b\u0103 spun c\u0103 ur\u0219ii din sudul Groenlandei difer\u0103 genetic de cei din nord, ceea ce sugereaz\u0103 c\u0103 ace\u0219tia s-ar putea adapta.<\/p>\n<div><picture loading=\"eager\" width=\"1400\" height=\"750\" alt=\"Ur\u0219i polari FOTO: Pixabay\"><source type=\"image\/webp\"  media=\"(min-width: 1400px)\"><source type=\"image\/webp\"  media=\"(min-width: 1000px)\"><source type=\"image\/webp\"  media=\"(min-width: 700px)\"><source type=\"image\/jpeg\"  media=\"(min-width: 1400px)\"><source type=\"image\/jpeg\"  media=\"(min-width: 1000px)\"><source type=\"image\/jpeg\"  media=\"(min-width: 700px)\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/cdn.adh.reperio.news\/image-d\/d6509beb-a73b-4da8-9258-c028075f4b37\/index.jpeg?p=a%3D1%26co%3D1.05%26w%3D700%26h%3D750%26r%3Dcontain%26f%3Dwebp\" alt=\"Ur\u0219i polari FOTO: Pixabay\" width=\"1400\" height=\"750\" loading=\"eager\"><\/picture>\n<p>Ur\u0219i polari FOTO: Pixabay<\/p>\n<\/div>\n<p>Cercet\u0103torii au detectat modific\u0103ri ale ADN-ului ur\u0219ilor polari care ar putea ajuta animalele s\u0103 se adapteze la climele mai calde, \u00eentr-un studiu considerat a fi prima dat\u0103 c\u00e2nd a fost g\u0103sit\u0103 o leg\u0103tur\u0103 semnificativ\u0103 din punct de vedere statistic \u00eentre cre\u0219terea temperaturilor \u0219i modificarea ADN-ului la o specie de mamifere s\u0103lbatice.<\/p>\n<p>Dezastrul climatic amenin\u021b\u0103 supravie\u021buirea ur\u0219ilor polari. Se preconizeaz\u0103 c\u0103 dou\u0103 treimi dintre ace\u0219tia vor disp\u0103rea p\u00e2n\u0103 \u00een 2050, pe m\u0103sur\u0103 ce habitatul lor \u00eenghe\u021bat se tope\u0219te \u0219i vremea devine mai cald\u0103, scrie <a href=\"https:\/\/www.theguardian.com\/environment\/2025\/dec\/12\/changes-to-polar-bear-dna-could-help-them-adapt-to-global-heating-study-finds?CMP=Share_AndroidApp_Other&#038;fbclid=IwY2xjawOolAJleHRuA2FlbQIxMABicmlkETEwQ29Dd3p1OEJrQTgzRzQ5c3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHl9dz_wvin4UyNADxFI8WDHwMp_WGVs6hyI1XO1SmhYIEjDzofdz-68zNyOA_aem_PJ7TFOnmgOBTkjHCVmcS8A\" rel=\"nofollow\">The Guardian.<\/a><\/p>\n<p>Acum, oamenii de \u0219tiin\u021b\u0103 de la University of East Anglia au descoperit c\u0103 unele gene legate de stresul termic, \u00eemb\u0103tr\u00e2nire \u0219i metabolism se comport\u0103 diferit la ur\u0219ii polari care tr\u0103iesc \u00een sud-estul Groenlandei, suger\u00e2nd c\u0103 ace\u0219tia s-ar putea adapta la condi\u021biile mai calde.<\/p>\n<p>Cercet\u0103torii au analizat probe de s\u00e2nge prelevate de la ur\u0219i polari din dou\u0103 regiuni ale Groenlandei \u0219i au comparat \u201e<i>genele s\u0103ritoare<\/i>\u201d: p\u0103r\u021bi mici \u0219i mobile ale genomului care pot influen\u021ba modul \u00een care func\u021bioneaz\u0103 alte gene. Oamenii de \u0219tiin\u021b\u0103 au analizat genele \u00een func\u021bie de temperaturile din cele dou\u0103 regiuni \u0219i de modific\u0103rile asociate \u00een expresia genelor.<\/p>\n<p><i>\u201eADN-ul este cartea de instruc\u021biuni din interiorul fiec\u0103rei celule, ghid\u00e2nd modul \u00een care un organism cre\u0219te \u0219i se dezvolt\u0103\u201d,<\/i> a declarat cercet\u0103torul principal, Dr. Alice Godden. <i>\u201eCompar\u00e2nd genele active ale acestor ur\u0219i cu datele climatice locale, am constatat c\u0103 temperaturile \u00een cre\u0219tere par s\u0103 determine o cre\u0219tere dramatic\u0103 a activit\u0103\u021bii genelor s\u0103ritoare din ADN-ul ur\u0219ilor din sud-estul Groenlandei.\u201d<\/i><\/p>\n<p>Pe m\u0103sur\u0103 ce clima \u0219i dieta local\u0103 evolueaz\u0103 ca urmare a schimb\u0103rilor de habitat \u0219i prad\u0103 for\u021bate de \u00eenc\u0103lzirea global\u0103, genetica ur\u0219ilor pare s\u0103 se adapteze, grupul de ur\u0219i din cea mai cald\u0103 parte a \u021b\u0103rii prezent\u00e2nd mai multe schimb\u0103ri dec\u00e2t comunit\u0103\u021bile aflate mai la nord. Autorii studiului au declarat c\u0103 aceste schimb\u0103ri ne-ar putea ajuta s\u0103 \u00een\u021belegem cum ar putea supravie\u021bui ur\u0219ii polari \u00eentr-o lume care se \u00eenc\u0103lze\u0219te, s\u0103 \u00een\u021belegem care sunt popula\u021biile <a href=\"https:\/\/adevarul.ro\/stil-de-viata\/magazin\/o-statie-de-cercetare-abandonata-din-arctica-2474965.html\">cele mai expuse riscului \u0219i s\u0103 orient\u0103m viitoarele eforturi de conservare.<\/a><\/p>\n<p>Acest lucru se datoreaz\u0103 faptului c\u0103 rezultatele, publicate vineri \u00een revista Mobile DNA, sugereaz\u0103 c\u0103 genele care se schimb\u0103 joac\u0103 un rol crucial \u00een modul \u00een care evolueaz\u0103 diferitele popula\u021bii de ur\u0219i polari.<\/p>\n<p>Godden a declarat: <i>\u201eAceast\u0103 descoperire este important\u0103 pentru c\u0103 arat\u0103, pentru prima dat\u0103, c\u0103 un grup unic de ur\u0219i polari din cea mai cald\u0103 parte a Groenlandei utilizeaz\u0103 \u201dgene s\u0103ritoare\u201e pentru a-\u0219i rescrie rapid propriul ADN, ceea ce ar putea fi un mecanism disperat de supravie\u021buire \u00eempotriva topirii ghe\u021bii marine.\u201d<\/i><\/p>\n<p>Temperaturile din nord-estul Groenlandei sunt mai reci \u0219i mai pu\u021bin variabile, \u00een timp ce \u00een sud-est exist\u0103<a href=\"https:\/\/adevarul.ro\/stil-de-viata\/calatorii\/jurnal-de-nord-canada-ziua-3-inconjurat-de-13-2355150.html\"> un mediu mult mai cald \u0219i mai pu\u021bin \u00eenghe\u021bat,<\/a> cu fluctua\u021bii accentuate de temperatur\u0103.<\/p>\n<p>Secven\u021bele ADN ale animalelor se modific\u0103 \u00een timp, dar acest proces poate fi accelerat de stresul mediului, cum ar fi \u00eenc\u0103lzirea rapid\u0103 a climei.<\/p>\n<p>Au fost observate unele modific\u0103ri interesante ale ADN-ului, cum ar fi \u00een zonele legate de prelucrarea gr\u0103similor, care ar putea ajuta ur\u0219ii polari s\u0103 supravie\u021buiasc\u0103 atunci c\u00e2nd hrana este rar\u0103. Ur\u0219ii din regiunile mai calde au o diet\u0103 mai dur\u0103, bazat\u0103 pe plante, \u00een compara\u021bie cu dieta gras\u0103, bazat\u0103 pe foci, a ur\u0219ilor din nord, iar ADN-ul ur\u0219ilor din sud-est pare s\u0103 se adapteze la acest lucru.<\/p>\n<p><i>\u201eAm identificat mai multe hotspot-uri genetice \u00een care aceste gene de salt erau foarte active, unele fiind localizate \u00een regiunile de codificare a proteinelor din genom, ceea ce sugereaz\u0103 c\u0103 ur\u0219ii sufer\u0103 schimb\u0103ri genetice rapide \u0219i fundamentale pe m\u0103sur\u0103 ce se adapteaz\u0103 la dispari\u021bia habitatului lor de ghea\u021b\u0103 de mare\u201d, <\/i>a mai spus Godden.<\/p>\n<p>Urm\u0103torul pas va fi examinarea altor popula\u021bii de ur\u0219i polari, care sunt \u00een num\u0103r de 20 \u00een \u00eentreaga lume, pentru a vedea dac\u0103 se produc schimb\u0103ri similare \u00een ADN-ul lor.<\/p>\n<p>Aceast\u0103 cercetare ar putea contribui la protejarea ur\u0219ilor de dispari\u021bie. Dar oamenii de \u0219tiin\u021b\u0103 au declarat c\u0103 este esen\u021bial s\u0103 se opreasc\u0103 accelerarea cre\u0219terii temperaturii prin reducerea arderii combustibililor fosili.<\/p>\n<\/p><\/div>\n<p><a href=\"https:\/\/adevarul.ro\/stil-de-viata\/stiinta\/ursii-polari-isi-modifica-adn-ul-pentru-a-se-2493782.html\" class=\"button purchase\" rel=\"nofollow noopener\" target=\"_blank\">Read More<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oamenii de \u0219tiin\u021b\u0103 spun c\u0103 ur\u0219ii din sudul Groenlandei difer\u0103 genetic de cei din nord, ceea ce sugereaz\u0103 c\u0103 ace\u0219tia s-ar putea adapta. Ur\u0219i polari [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9621,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-9620","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-popular"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/posts\/9620","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/comments?post=9620"}],"version-history":[{"count":0,"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/posts\/9620\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/media\/9621"}],"wp:attachment":[{"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/media?parent=9620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/categories?post=9620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/info-eforie.ro\/index.php\/wp-json\/wp\/v2\/tags?post=9620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}