{"id":1028,"date":"2026-06-16T13:55:46","date_gmt":"2026-06-16T13:55:46","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=1028"},"modified":"2026-06-16T13:55:46","modified_gmt":"2026-06-16T13:55:46","slug":"tibetan-mastiffs-high-altitude-adaptation-adaptive-introgression","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/cs\/science\/zoology\/tibetan-mastiffs-high-altitude-adaptation-adaptive-introgression\/","title":{"rendered":"Tibetsk\u00e9 mastify: Genetick\u00e1 zkratka k \u017eivotu ve v\u00fd\u0161k\u00e1ch"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Jak se tibetsk\u00e9 mastify staly \u0161ampi\u00f3ny ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch<\/h2>\n\n<h2 class=\"wp-block-heading\">Adaptivn\u00ed introgrese: genetick\u00e1 zkratka<\/h2>\n\n<p>Tibetsk\u00fd mastif s charakteristick\u00fdm hust\u00fdm rufem a impozantn\u00ed postavou prosperuje v \u0159\u00eddce okysli\u010den\u00e9m vzduchu tibetsk\u00e9 n\u00e1horn\u00ed plo\u0161iny, prost\u0159ed\u00ed, kter\u00e9 p\u0159edstavuje v\u00fdzvu pro v\u011bt\u0161inu zv\u00ed\u0159at. Ale jak si tito psi osvojili adaptace pot\u0159ebn\u00e9 k p\u0159ekon\u00e1n\u00ed tak extr\u00e9mn\u00edch podm\u00ednek?<\/p>\n\n<p>Do hry vstupuje adaptivn\u00ed introgrese, fenom\u00e9n, p\u0159i kter\u00e9m si druh z\u00edsk\u00e1v\u00e1 v\u00fdhodn\u00e9 rysy k\u0159\u00ed\u017een\u00edm s jin\u00fdm, l\u00e9pe p\u0159izp\u016fsoben\u00fdm druhem. Genetik Zhen Wang ze \u0160anghajsk\u00fdch \u00fastav\u016f biologick\u00fdch v\u011bd podez\u00edral, \u017ee tibet\u0161t\u00ed mastifi tuto evolu\u010dn\u00ed zkratku vyu\u017eili k\u0159\u00ed\u017een\u00edm se \u0161ed\u00fdmi vlky, zv\u00ed\u0159aty ji\u017e p\u0159izp\u016fsoben\u00fdmi vysok\u00fdm nadmo\u0159sk\u00fdm v\u00fd\u0161k\u00e1m.<\/p>\n\n<h2 class=\"wp-block-heading\">Odhalen\u00ed genetick\u00fdch tajemstv\u00ed<\/h2>\n\n<p>Aby otestoval svou teorii, Wang analyzoval geny tibetsk\u00fdch mastif\u016f a hledal unik\u00e1tn\u00ed genetick\u00e9 variace spojen\u00e9 s \u00fasp\u011bchem ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch. Tak\u00e9 zkoumal genomy 49 druh\u016f psovit\u00fdch \u017eivo\u010dich\u016f \u017eij\u00edc\u00edch v bl\u00edzkosti tibetsk\u00e9 n\u00e1horn\u00ed plo\u0161iny, v\u010detn\u011b vlk\u016f, ps\u016f a \u0161akal\u016f.<\/p>\n\n<p>Jeho t\u00fdm objevil dva speci\u00e1ln\u00ed genov\u00e9 varianty sd\u00edlen\u00e9 v\u00fdhradn\u011b tibetsk\u00fdmi mastify a \u0161ed\u00fdmi vlky: geny HBB a EPAS1. Tyto varianty spolupracuj\u00ed na zvy\u0161ov\u00e1n\u00ed efektivity kysl\u00edku a p\u0159edch\u00e1zen\u00ed sr\u00e1\u017een\u00ed krve ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch.<\/p>\n\n<h2 class=\"wp-block-heading\">Role gen\u016f HBB a EPAS1<\/h2>\n\n<p>Varianta genu HBB zvy\u0161uje kapacitu hemoglobinu, b\u00edlkoviny v \u010derven\u00fdch krvink\u00e1ch, kter\u00e1 transportuje kysl\u00edk po cel\u00e9m t\u011ble. Tato adaptace umo\u017e\u0148uje tibetsk\u00fdm mastif\u016fm z\u00edskat v\u00edce kysl\u00edku z \u0159\u00eddk\u00e9ho vzduchu ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch.<\/p>\n\n<p>Varianta genu EPAS1 naopak podporuje r\u016fst krevn\u00edch c\u00e9v a sou\u010dasn\u011b potla\u010duje celkovou tvorbu hemoglobinu. To zabra\u0148uje t\u011blu v nadm\u011brn\u00e9 produkci hemoglobinu jako reakci na n\u00edzkou hladinu kysl\u00edku, \u010d\u00edm\u017e sni\u017euje riziko tvorby krevn\u00edch sra\u017eenin a mrtvice.<\/p>\n\n<h2 class=\"wp-block-heading\">P\u0159ekvapiv\u00fd zvrat v evolu\u010dn\u00ed historii<\/h2>\n\n<p>Wangova studie nazna\u010duje, \u017ee pozoruhodn\u00e9 adaptace tibetsk\u00fdch mastif\u016f na vysok\u00e9 nadmo\u0159sk\u00e9 v\u00fd\u0161ky byly z\u00edsk\u00e1ny relativn\u011b ned\u00e1vno, p\u0159ed zhruba 24\u202f000 lety. Tento objev zpochyb\u0148uje tradi\u010dn\u00ed darwinovsk\u00e9 pojet\u00ed \u201ep\u0159e\u017eit\u00ed nejschopn\u011bj\u0161\u00edch\u201c a ukazuje, \u017ee druhy mohou n\u011bkdy t\u011b\u017eit z p\u0159eb\u00edr\u00e1n\u00ed v\u00fdhodn\u00fdch gen\u016f od jin\u00fdch druh\u016f.<\/p>\n\n<h2 class=\"wp-block-heading\">D\u016fsledky pro jin\u00e9 druhy<\/h2>\n\n<p>Studie tibetsk\u00fdch mastif\u016f a jejich adaptivn\u00ed introgrese m\u00e1 v\u00fdznam pro pochopen\u00ed toho, jak se jin\u00e9 druhy p\u0159izp\u016fsobuj\u00ed extr\u00e9mn\u00edm prost\u0159ed\u00edm. Zd\u016fraz\u0148uje roli genetick\u00e9 v\u00fdm\u011bny p\u0159i urychlen\u00fdch evolu\u010dn\u00edch zm\u011bn\u00e1ch a nazna\u010duje, \u017ee mezidruhov\u00e9 k\u0159\u00ed\u017een\u00ed m\u016f\u017ee b\u00fdt kl\u00ed\u010dov\u00fdm faktorem p\u0159e\u017eit\u00ed a diverzifikace \u017eivota na Zemi.<\/p>\n\n<h2 class=\"wp-block-heading\">Dal\u0161\u00ed poznatky<\/h2>\n\n<ul class=\"wp-block-list\">\n<li>Adaptace tibetsk\u00fdch mastif\u016f na vysok\u00e9 nadmo\u0159sk\u00e9 v\u00fd\u0161ky zahrnuj\u00ed zv\u00fd\u0161enou efektivitu vyu\u017eit\u00ed kysl\u00edku, sn\u00ed\u017een\u00e9 riziko sr\u00e1\u017een\u00ed krve a schopnost odol\u00e1vat n\u00edzk\u00fdm hladin\u00e1m kysl\u00edku.<\/li>\n<li>Adaptivn\u00ed introgrese umo\u017enila tibetsk\u00fdm mastif\u016fm z\u00edskat tyto adaptace k\u0159\u00ed\u017een\u00edm se \u0161ed\u00fdmi vlky, kter\u00e9 ji\u017e byly dob\u0159e p\u0159izp\u016fsobeny drsn\u00fdm podm\u00ednk\u00e1m tibetsk\u00e9 n\u00e1horn\u00ed plo\u0161iny.<\/li>\n<li>Geny HBB a EPAS1 hraj\u00ed z\u00e1sadn\u00ed roli v \u00fasp\u011bchu tibetsk\u00fdch mastif\u016f ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch t\u00edm, \u017ee zvy\u0161uj\u00ed kapacitu p\u0159enosu kysl\u00edku a reguluj\u00ed r\u016fst krevn\u00edch c\u00e9v.<\/li>\n<li>Studie poskytuje d\u016fkazy, \u017ee druhy mohou t\u011b\u017eit z mezidruhov\u00e9ho k\u0159\u00ed\u017een\u00ed, co\u017e zpochyb\u0148uje tradi\u010dn\u00ed pohledy na evolu\u010dn\u00ed sout\u011b\u017e.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Jak se tibetsk\u00e9 mastify staly \u0161ampi\u00f3ny ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch Adaptivn\u00ed introgrese: genetick\u00e1 zkratka Tibetsk\u00fd mastif s charakteristick\u00fdm hust\u00fdm rufem a impozantn\u00ed postavou prosperuje v \u0159\u00eddce okysli\u010den\u00e9m vzduchu tibetsk\u00e9 n\u00e1horn\u00ed&hellip;<\/p>\n","protected":false},"author":1,"featured_media":25505,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280],"tags":[2398,2399,136,188,2397,2396],"class_list":["post-1028","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zoology","tag-adaptive-introgression","tag-canine-biology","tag-evolution","tag-genetics","tag-high-altitude-adaptation","tag-tibetan-mastiff"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=1028"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1028\/revisions"}],"predecessor-version":[{"id":25506,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/1028\/revisions\/25506"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media\/25505"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=1028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=1028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=1028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}