Maření „zlaté“ příležitosti

PALO ALTO – Skupina vědců z několika evropských zemí využila postupů genového sestřihu k vytvoření pozoruhodného rajského jablka. Pyšní se sytě nachovou slupkou i dužninou a obsahuje hladiny antioxidantů o 200% vyšší než u nemodifikovaných rajčat. Když se tato rajčata podávala myším silně náchylným k rakovině, výrazně jim prodloužila život.

Těmto výzkumům se dostalo široké pozornosti, ale neméně významný pokrok v oblasti genetické modifikace se už téměř deset let povětšinou přehlíží. Jde o průkopnickou „zlatou rýži“, soubor nových odrůd rýže, která je biologicky obohacená pomocí genů vyjadřujících se jako beta-karoten, prekurzor vitaminu A, který se v těle dle potřeby mění v aktivní formu.

Většina lékařů v Severní Americe a v Evropě se během své profesní kariéry nesetká ani s jediným případem nedostatku vitaminu A. Situace je však zcela jiná v chudých zemích, kde je nedostatek vitaminu A epidemický mezi chudými lidmi, v jejichž stravě převládá právě rýže (neobsahující ani beta-karoten, ani vitamin A) či jiné zdroje kalorií bohaté na uhlovodany a chudé na vitaminy.

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