{"id":79578,"date":"2025-05-25T00:18:09","date_gmt":"2025-05-24T22:18:09","guid":{"rendered":"https:\/\/www.infokuryr.cz\/n\/?p=79578"},"modified":"2025-05-24T13:11:12","modified_gmt":"2025-05-24T11:11:12","slug":"obelisky-ve-strevech-na-stope-nove-formy-zivota","status":"publish","type":"post","link":"https:\/\/www.infokuryr.cz\/n\/2025\/05\/25\/obelisky-ve-strevech-na-stope-nove-formy-zivota\/","title":{"rendered":"Obelisky ve st\u0159evech: Na stop\u011b nov\u00e9 formy \u017eivota?"},"content":{"rendered":"
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\u017dij\u00ed v na\u0161ich st\u0159evech, jsou mikroskopicky mal\u00e9 a mohou pat\u0159it do zcela nov\u00e9 t\u0159\u00eddy biologick\u00fdch entit: takzvan\u00fdch obelisk\u016f. Tyto z\u00e1hadn\u00e9 struktury RNA produkuj\u00ed vlastn\u00ed proteiny, pou\u017e\u00edvaj\u00ed bakterie jako hostitele \u2013 a mohly by zpochybnit na\u0161e ch\u00e1p\u00e1n\u00ed samotn\u00e9ho \u017eivota.<\/span><\/strong><\/p>\n

V hlubin\u00e1ch na\u0161eho t\u011bla \u017eije nezvl\u00e1dnuteln\u00e9 mno\u017estv\u00ed mikroorganism\u016f \u2013 bakterie, viry, pl\u00edsn\u011b a mnoho dal\u0161\u00edch. Lidsk\u00e9 st\u0159evo nen\u00ed jen tr\u00e1vic\u00ed org\u00e1n, ale mikrokosmos pro biliony mikrob\u016f, kter\u00e9 mnoha zp\u016fsoby ovliv\u0148uj\u00ed na\u0161i pohodu. V posledn\u00edch letech se v\u00fdzkum mikrobiomu rychle rozv\u00edj\u00ed a odhalil \u010detn\u00e9 souvislosti mezi st\u0159evn\u00ed fl\u00f3rou a zdrav\u00edm. Ale nyn\u00ed jeden objev vrh\u00e1 v\u0161e, co jsme si d\u0159\u00edve mysleli, do zmatku \u2013 a m\u016f\u017ee dokonce zpochybnit na\u0161i definici \u017eivota.<\/span><\/p>\n

N\u00e1lez jako z jin\u00e9 planety<\/span><\/h3>\n

Mezin\u00e1rodn\u00ed t\u00fdm v\u00fdzkumn\u00edk\u016f veden\u00fd Ivanem \u017deludevem ze Stanfordsk\u00e9 univerzity objevil p\u0159i anal\u00fdze lidsk\u00fdch vzork\u016f\u00a0<\/span>genetick\u00e9 struktury<\/span><\/a>\u00a0tak bizarn\u00ed a nov\u00e9, \u017ee by mohly p\u0159edstavovat zcela novou t\u0159\u00eddu biologick\u00fdch entit. Tyto drobn\u00e9 molekuly RNA, kter\u00e9 v\u011bdci nazvali \u201eobelisky\u201c, se skl\u00e1daj\u00ed z kruhov\u00e9 RNA s neobvyklou ty\u010dinkovitou sekund\u00e1rn\u00ed strukturou. Jsou dlouh\u00e9 asi 1 000 nukleotid\u016f \u2013 p\u0159\u00edli\u0161 mal\u00e9 pro klasick\u00e9 viry, ale p\u0159\u00edli\u0161 slo\u017eit\u00e9 na to, aby byly pova\u017eov\u00e1ny za pouh\u00e9 bun\u011b\u010dn\u00e9 zbytky.<\/span><\/p>\n

Obelisky se z\u00e1sadn\u011b li\u0161\u00ed od zn\u00e1m\u00fdch vir\u016f nebo viroid\u016f. A\u010dkoli se na prvn\u00ed pohled podobaj\u00ed rostlinn\u00fdm viroid\u016fm \u2013 tak\u00e9 kruhov\u00fdm molekul\u00e1m RNA \u2013 obelisky obsahuj\u00ed kompletn\u00ed genetick\u00fd program pro produkci vlastn\u00edch protein\u016f. V\u011bdci identifikovali tzv. \u201eotev\u0159en\u00e9 \u010dtec\u00ed r\u00e1mce\u201c, kter\u00e9 k\u00f3duj\u00ed mal\u00e9 proteiny, je\u017e nazvali \u201eobliny\u201c. D\u00edky t\u00e9to schopnosti jsou obelisky biologicky exotick\u00e9 \u2013 n\u011bco mezi virem, viroidem a n\u011b\u010d\u00edm zcela nov\u00fdm.<\/span><\/p>\n

Glob\u00e1ln\u00ed fenom\u00e9n<\/span><\/h3>\n

Objev je obzvl\u00e1\u0161t\u011b pozoruhodn\u00fd t\u00edm, \u017ee obelisky jsou zjevn\u011b\u00a0<\/span>roz\u0161\u00ed\u0159en\u00e9<\/span><\/a>\u00a0. V\u011bdci zkoumali vzorky z \u00fastn\u00edho a st\u0159evn\u00edho mikrobiomu stovek lid\u00ed r\u016fzn\u00e9ho p\u016fvodu. D\u016fkazy o t\u011bchto struktur\u00e1ch RNA byly nalezeny v p\u0159ibli\u017en\u011b 50 procentech vzork\u016f slin a asi 7 procentech vzork\u016f stolice. Celkem identifikovali t\u00e9m\u011b\u0159 30 000 r\u016fzn\u00fdch sekvenc\u00ed obelisk\u016f \u2013 co\u017e je jasn\u00fdm d\u016fkazem obrovsk\u00e9 genetick\u00e9 rozmanitosti a d\u0159\u00edve p\u0159ehl\u00ed\u017een\u00e9 biologick\u00e9 p\u0159\u00edtomnosti v lidsk\u00e9m t\u011ble.<\/span><\/p>\n

Zd\u00e1 se, \u017ee rozmno\u017eov\u00e1n\u00ed obelisk\u016f z\u00e1vis\u00ed na specifick\u00fdch mikrobi\u00e1ln\u00edch hostitel\u00edch. Obzvl\u00e1\u0161t\u011b \u010dast\u00e9 byly ve spojen\u00ed s bakteri\u00e1ln\u00edm druhem Streptococcus sanguinis, b\u011b\u017en\u00fdm obyvatelem lidsk\u00e9 \u00fastn\u00ed dutiny. Experimenty uk\u00e1zaly, \u017ee obelisky mohou v t\u011bchto bakteri\u00edch existovat, ani\u017e by v\u00fdznamn\u011b ovliv\u0148ovaly jejich r\u016fst. Zda je v\u0161ak tento vztah neutr\u00e1ln\u00ed, symbiotick\u00fd nebo dokonce parazitick\u00fd, z\u016fst\u00e1v\u00e1 nejasn\u00e9.<\/span><\/p>\n

Ani virus, ani bun\u011b\u010dn\u00e9 j\u00e1dro \u2013 co jsou vlastn\u011b obelisky?<\/span><\/h3>\n

Tento objev zpochyb\u0148uje klasick\u00e1 krit\u00e9ria pou\u017e\u00edvan\u00e1 biology ke kategorizaci \u017eiv\u00fdch bytost\u00ed. Obelisky nemaj\u00ed vlastn\u00ed metabolick\u00fd syst\u00e9m a pro rozmno\u017eov\u00e1n\u00ed jsou z\u00e1visl\u00e9 na hostiteli \u2013 podobn\u011b jako viry. Z\u00e1rove\u0148 v\u0161ak produkuj\u00ed proteiny, co\u017e je jasn\u011b odli\u0161uje od viroid\u016f, co\u017e jsou \u010dist\u00e9 smy\u010dky RNA bez jak\u00e9koli k\u00f3duj\u00edc\u00ed funkce. A a\u010dkoli nemaj\u00ed j\u00e1dro, vykazuj\u00ed genetickou organizaci, kter\u00e1 byla d\u0159\u00edve nezn\u00e1m\u00e1.<\/span><\/p>\n

Tyto rysy vedou k fascinuj\u00edc\u00ed ot\u00e1zce: Jsou obelisky zcela novou formou \u017eivota? Takov\u00fd, kter\u00fd mohl b\u00fdt po tis\u00edce let skryt v lidsk\u00e9m t\u011ble, ani\u017e by byl objeven? Nebylo by to poprv\u00e9 v historii biologie, kdy by nov\u00e1 forma \u017eivota zpo\u010d\u00e1tku existovala mezi n\u00e1mi zcela bez pov\u0161imnut\u00ed \u2013 sta\u010d\u00ed vzpomenout na pozdn\u00ed objev samotn\u00fdch mikrob\u016f.<\/span><\/p>\n

P\u0159\u00edtel, nebo nep\u0159\u00edtel? Velk\u00e1 nezn\u00e1m\u00e1<\/span><\/h3>\n

St\u00e1le nen\u00ed\u00a0<\/span>zcela jasn\u00e9,<\/span><\/a>\u00a0jakou roli hraj\u00ed obelisky v na\u0161em t\u011ble. Pokud se chovaj\u00ed paraziticky, mohou naru\u0161it k\u0159ehkou rovnov\u00e1hu na\u0161eho mikrobiomu. Zejm\u00e9na ve st\u0159ev\u011b, kde je vyv\u00e1\u017een\u00e1 interakce mikrob\u016f kl\u00ed\u010dov\u00e1 pro tr\u00e1ven\u00ed, imunitn\u00ed syst\u00e9m a dokonce i na\u0161i n\u00e1ladu, by nerovnov\u00e1ha mohla m\u00edt fat\u00e1ln\u00ed n\u00e1sledky. Souvislost se z\u00e1n\u011btliv\u00fdmi onemocn\u011bn\u00edmi st\u0159ev, metabolick\u00fdmi poruchami nebo dokonce neurologick\u00fdmi onemocn\u011bn\u00edmi je p\u0159edstaviteln\u00e1.<\/span><\/p>\n

Obelisky by v\u0161ak stejn\u011b dob\u0159e mohly plnit d\u0159\u00edve nerozpoznanou podp\u016frnou funkci. Mo\u017en\u00e1 stabilizuj\u00ed ur\u010dit\u00e9 kmeny bakteri\u00ed nebo produkuj\u00ed l\u00e1tky, kter\u00e9 moduluj\u00ed n\u00e1\u0161 imunitn\u00ed syst\u00e9m. N\u011bkte\u0159\u00ed v\u011bdci ji\u017e spekuluj\u00ed, zda z toho lze vyvinout nov\u00e9 terapeutick\u00e9 p\u0159\u00edstupy \u2013 nap\u0159\u00edklad c\u00edlenou manipulac\u00ed s mikrobiomem pomoc\u00ed struktur podobn\u00fdch obelisku. Ale je p\u0159ed n\u00e1mi je\u0161t\u011b dlouh\u00e1 cesta.<\/span><\/p>\n

Nov\u00e1 kapitola v evolu\u010dn\u00ed biologii<\/span><\/h3>\n

Objev obelisk\u016f nejen vyvol\u00e1v\u00e1 l\u00e9ka\u0159sk\u00e9 ot\u00e1zky, ale dot\u00fdk\u00e1 se tak\u00e9 z\u00e1kladn\u00edch koncept\u016f evolu\u010dn\u00ed biologie. Jak se tyto struktury RNA vyvinuly? Jsou to poz\u016fstatky ran\u00fdch RNA sv\u011bt\u016f, jak se p\u0159edpokl\u00e1d\u00e1 v teori\u00edch o p\u016fvodu \u017eivota? Nebo je to nov\u00e1 evolu\u010dn\u00ed linie, kter\u00e1 se vyvinula paraleln\u011b se zn\u00e1m\u00fdmi formami \u017eivota?<\/span><\/p>\n

Obelisky mohou b\u00fdt poz\u016fstatky minul\u00e9 \u00e9ry, kdy byl \u017eivot zalo\u017een na RNA, ne\u017e DNA a proteiny p\u0159evzaly biologickou f\u00e1zi. V ka\u017ed\u00e9m p\u0159\u00edpad\u011b jejich struktura siln\u011b p\u0159ipom\u00edn\u00e1 prvky, kter\u00e9 mohly hr\u00e1t hlavn\u00ed roli v d\u0159\u00edv\u011bj\u0161\u00edch f\u00e1z\u00edch evoluce. Jejich objev by mohl nejen roz\u0161\u00ed\u0159it na\u0161e ch\u00e1p\u00e1n\u00ed mikrobiomu, ale tak\u00e9 poskytnout vod\u00edtka k hlub\u0161\u00ed historii samotn\u00e9ho \u017eivota.<\/span><\/p>\n

V\u00fdhled: Meze zn\u00e1m\u00e9ho<\/span><\/h3>\n

Obelisky jsou fascinuj\u00edc\u00ed biologi\u010dt\u00ed p\u0159ekra\u010dova\u010di hranic. Ani zjevn\u011b \u017eiv\u00ed, ani zcela bez \u017eivota, pohybuj\u00ed se v \u0161ed\u00e9 z\u00f3n\u011b mezi biologi\u00ed a chemi\u00ed. Jejich objev p\u016fsobiv\u011b ukazuje, jak m\u00e1lo toho v\u00edme o mikrokosmu v n\u00e1s \u2013 a kolik p\u0159ekvapen\u00ed se v n\u011bm st\u00e1le m\u016f\u017ee skr\u00fdvat. Obelisky otev\u00edraj\u00ed novou oblast v\u00fdzkumu mikrobiomu, kter\u00e1 dalece p\u0159esahuje dosavadn\u00ed perspektivy.<\/span><\/p>\n

Budouc\u00ed studie budou muset uk\u00e1zat, zda tento objev povede ke konkr\u00e9tn\u00edm aplikac\u00edm v medic\u00edn\u011b nebo biotechnologi\u00edch. Jedna v\u011bc je v\u0161ak ji\u017e jasn\u00e1: obelisky jsou fascinuj\u00edc\u00edm p\u0159\u00edkladem toho, jak lze i v 21. stolet\u00ed objevovat zcela nov\u00e9 biologick\u00e9 jevy. A \u017ee mo\u017en\u00e1 bude pot\u0159eba p\u0159ehodnotit na\u0161i definici \u017eivota.<\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u017dij\u00ed v na\u0161ich st\u0159evech, jsou mikroskopicky mal\u00e9 a mohou pat\u0159it do zcela nov\u00e9 t\u0159\u00eddy biologick\u00fdch…<\/p>\n","protected":false},"author":2,"featured_media":79579,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[7970,9183,9182,2554,5426,21],"_links":{"self":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts\/79578"}],"collection":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/comments?post=79578"}],"version-history":[{"count":0,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts\/79578\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/media\/79579"}],"wp:attachment":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/media?parent=79578"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/categories?post=79578"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/tags?post=79578"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}