{"id":1384049,"date":"2026-04-20T07:51:57","date_gmt":"2026-04-20T05:51:57","guid":{"rendered":"https:\/\/dnaera.com\/cs\/?p=1384049"},"modified":"2026-04-20T08:09:22","modified_gmt":"2026-04-20T06:09:22","slug":"odolnost-vuci-malarii","status":"publish","type":"post","link":"https:\/\/dnaera.com\/cs\/blog\/odolnost-vuci-malarii\/","title":{"rendered":"Sv\u011btov\u00fd den mal\u00e1rie: Co n\u00e1m o ochran\u011b p\u0159ed mal\u00e1ri\u00ed \u0159\u00edk\u00e1 genetika?"},"content":{"rendered":"\n

Ka\u017ed\u00fd rok 25. dubna si p\u0159ipom\u00edn\u00e1me Sv\u011btov\u00fd den mal\u00e1rie. <\/strong>Jeho c\u00edlem je upozornit na jednu z nejz\u00e1va\u017en\u011bj\u0161\u00edch infek\u010dn\u00edch nemoc\u00ed na sv\u011bt\u011b. Mal\u00e1ri\u00ed ka\u017edoro\u010dn\u011b onemocn\u00ed miliony lid\u00ed, zejm\u00e9na v tropick\u00fdch a subtropick\u00fdch oblastech. Krom\u011b prevence, l\u00e9\u010dby a huben\u00ed kom\u00e1r\u016f se v\u0161ak v\u011bdci st\u00e1le v\u00edce zam\u011b\u0159uj\u00ed tak\u00e9 na roli genetiky v p\u0159irozen\u00e9 ochran\u011b \u010dlov\u011bka p\u0159ed touto nemoc\u00ed.<\/em><\/p>\n\n\n\n

N\u011bkte\u0159\u00ed lid\u00e9 toti\u017e mohou m\u00edt ve sv\u00e9 DNA varianty, kter\u00e9 ovliv\u0148uj\u00ed, jak snadno se parazit dok\u00e1\u017ee dostat do jejich \u010derven\u00fdch krvinek. Jedn\u00edm z nejzaj\u00edmav\u011bj\u0161\u00edch p\u0159\u00edklad\u016f je Duffy antigen<\/strong>, specifick\u00e1 molekula na povrchu \u010derven\u00fdch krvinek, kter\u00e1 m\u016f\u017ee hr\u00e1t kl\u00ed\u010dovou roli p\u0159i infekci mal\u00e1ri\u00ed zp\u016fsoben\u00e9 jedn\u00edm konkr\u00e9tn\u00edm druhem parazita. Jak m\u016f\u017ee pr\u00e1v\u011b tento genetick\u00fd detail ovlivnit riziko infekce?<\/p>\n\n\n\n

Co je to mal\u00e1rie a jak vznik\u00e1?<\/strong><\/h2>\n\n\n\n

Mal\u00e1rie je infek\u010dn\u00ed onemocn\u011bn\u00ed zp\u016fsoben\u00e9 mikroskopick\u00fdmi parazity rodu Plasmodium. Na \u010dlov\u011bka se p\u0159en\u00e1\u0161\u00ed po bodnut\u00ed infikovanou sami\u010dkou kom\u00e1ra rodu Anopheles. Kdy\u017e kom\u00e1r nasaje krev infikovan\u00e9ho \u010dlov\u011bka a n\u00e1sledn\u011b bodne dal\u0161\u00edho hostitele, m\u016f\u017ee spolu se slinami p\u0159en\u00e9st parazita do jeho krevn\u00edho ob\u011bhu.<\/p>\n\n\n\n

\"Malarie,<\/figure>\n\n\n\n

Po vstupu do t\u011bla v\u0161ak parazit neza\u010dne okam\u017eit\u011b vyvol\u00e1vat p\u0159\u00edznaky. Nejprve se dostane do jater, kde se v bu\u0148k\u00e1ch n\u011bkolik dn\u00ed a\u017e t\u00fddn\u016f mno\u017e\u00ed, ani\u017e by na sebe upozor\u0148oval. Teprve po t\u00e9to tich\u00e9 f\u00e1zi se paraziti uvoln\u00ed do krevn\u00edho ob\u011bhu a za\u010dnou napadat \u010derven\u00e9 krvinky (erytrocyty). Pr\u00e1v\u011b tato f\u00e1ze je zodpov\u011bdn\u00e1 za typick\u00e9 projevy mal\u00e1rie, jako jsou opakuj\u00edc\u00ed se hore\u010dky, zimnice, an\u00e9mie nebo v\u00fdrazn\u00e1 \u00fanava.<\/p>\n\n\n\n

V\u011bdci dnes znaj\u00ed p\u011bt druh\u016f parazit\u016f rodu Plasmodium, p\u0159i\u010dem\u017e nejz\u00e1va\u017en\u011bj\u0161\u00ed formy onemocn\u011bn\u00ed zp\u016fsobuje Plasmodium falciparum, kter\u00fd je roz\u0161\u00ed\u0159en zejm\u00e9na v subsaharsk\u00e9 Africe. Druh Plasmodium vivax<\/strong>, na kter\u00fd se zam\u011b\u0159uje i genetick\u00fd mechanismus sledovan\u00fd v na\u0161\u00ed anal\u00fdze, je naopak nejroz\u0161\u00ed\u0159en\u011bj\u0161\u00edm p\u016fvodcem mal\u00e1rie mimo Afriku.<\/p>\n\n\n\n

Kdy genetika ovliv\u0148uje infekci mal\u00e1ri\u00ed?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

V\u011bdci dnes st\u00e1le \u010dast\u011bji zji\u0161\u0165uj\u00ed, \u017ee u tohoto onemocn\u011bn\u00ed nehraje roli pouze prost\u0159ed\u00ed, ale tak\u00e9 genetika \u010dlov\u011bka. N\u011bkter\u00e9 genetick\u00e9 varianty toti\u017e mohou ovlivnit, zda se parazit dok\u00e1\u017ee dostat do na\u0161ich \u010derven\u00fdch krvinek.<\/p>\n\n\n\n

Jedn\u00edm z takov\u00fdch p\u0159\u00edklad\u016f je tzv. Duffy antigen<\/strong>, molekula na povrchu \u010derven\u00fdch krvinek, kterou parazit Plasmodium vivax vyu\u017e\u00edv\u00e1 k vstupu do bu\u0148ky. V na\u0161\u00ed DNA anal\u00fdze sledujeme genetickou variantu v genu ACKR1<\/strong>, kter\u00e1 m\u016f\u017ee ovlivnit tvorbu tohoto antigenu.<\/p>\n\n\n\n

Pokud se Duffyho antigen na \u010derven\u00fdch krvink\u00e1ch nevytv\u00e1\u0159\u00ed, m\u016f\u017ee m\u00edt parazit Plasmodium vivax v\u00fdrazn\u011b zt\u00ed\u017een\u00fd vstup do bun\u011bk. To m\u016f\u017ee poskytovat p\u0159irozenou ochranu p\u0159ed t\u00edmto typem mal\u00e1rie.<\/p>\n\n\n\n

Je v\u0161ak d\u016fle\u017eit\u00e9 zd\u016fraznit, \u017ee se jedn\u00e1 o specifick\u00fd mechanismus t\u00fdkaj\u00edc\u00ed se pouze jednoho druhu parazita, nikoli o ochranu p\u0159ed v\u0161emi formami mal\u00e1rie.<\/strong><\/p>\n\n\n\n

Pro\u010d je dobr\u00e9 zn\u00e1t tuto predispozici?<\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

Mal\u00e1rie je v\u00fdsledkem slo\u017eit\u00e9ho biologick\u00e9ho cyklu mezi kom\u00e1rem, parazitem a lidsk\u00fdm organismem. V jedn\u00e9 z jej\u00edch nejd\u016fle\u017eit\u011bj\u0161\u00edch f\u00e1z\u00ed, p\u0159i napaden\u00ed \u010derven\u00fdch krvinek, m\u016f\u017ee hr\u00e1t roli i genetick\u00e1 v\u00fdbava \u010dlov\u011bka. Znalost t\u00e9to predispozice n\u00e1m p\u0159in\u00e1\u0161\u00ed zaj\u00edmav\u00fd pohled na to, jak se lidsk\u00fd organismus v pr\u016fb\u011bhu evoluce p\u0159izp\u016fsoboval infek\u010dn\u00edm chorob\u00e1m. Z\u00e1rove\u0148 ukazuje, \u017ee i mal\u00e9 rozd\u00edly v na\u0161\u00ed DNA mohou ovlivnit vztah mezi \u010dlov\u011bkem a mikroorganismy, kter\u00e9 n\u00e1s doprov\u00e1zej\u00ed ji\u017e tis\u00edce let.<\/p>\n\n\n\n

Nov\u00fd v\u00fdsledek ve va\u0161\u00ed DNA anal\u00fdze<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

P\u0159ihlaste se<\/a> ke sv\u00fdm v\u00fdsledk\u016fm. Genetick\u00e1 predispozice k odolnosti proti mal\u00e1rii zp\u016fsoben\u00e9 parazitem Plasmodium vivax je od nyn\u011bj\u0161ka zdarma dostupn\u00e1 pro v\u0161echny na\u0161e z\u00e1kazn\u00edky. Z\u00e1rove\u0148 ji bude m\u00edt ve sv\u00e9 anal\u00fdze ka\u017ed\u00fd budouc\u00ed z\u00e1kazn\u00edk, kter\u00fd vstoup\u00ed do sv\u011bta DNA s DNA Complex testem<\/a>. Poznejte sv\u00e9 predispozice i vy.
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Zdroje<\/strong><\/strong><\/h2>\n\n\n\n