EnTrans , 04.04.2006 23:28
Ãðóïïå àâñòðàëèéñêèõ èññëåäîâàòåëåé óäàëîñü ïðîëèòü ñâåò íà îäèí èç ôóíäàìåíòàëüíûõ âîïðîñîâ áèîëîãèè - ïî÷åìó ó ìóæñêèõ îñîáåé îáðàçóþòñÿ ñïåðìàòîçîèäû, à ó æåíñêèõ - ÿéöåêëåòêè. Ó÷¸íûå èç Institute for Molecular Bioscience (University of Queensland) îáíàðóæèëè, ÷òî äåðèâàòû âèòàìèíà À èíäóöèðóþò ïðîöåññû ìåéîçà. Ãåðìèíàòèâíûå êëåòêè, êîòîðûå ñòàíîâÿòñÿ ÿéöåêëåòêàìè èëè ñïåðìàòîçîèäàìè, èäåíòè÷íû ó ìóæñêèõ è æåíñêèõ ýìáðèîíîâ. Îáðàçóþòñÿ èç ãåðìèíàòèâíûõ êëåòîê ñïåðìàòîçîèäû èëè ÿéöåêëåòêè, çàâèñèò îò âðåìåíè íà÷àëà ìåéîçà. Ó ñàìîê ìåéîç íà÷èíàåòñÿ äî ðîæäåíèÿ, è îáðàçóþòñÿ ÿéöåêëåòêè, à ó ñàìöîâ - ïîñëå ðîæäåíèÿ, è èç ãåðìèíàòèâíûõ êëåòîê ôîðìèðóþòñÿ ñïåðìàòîçîèäû. Âûÿñíåíî, ÷òî ðåòèíîåâàÿ êèñëîòà, äåðèâàò âèòàìèíà A, èíäóöèðóåò ìåéîç ãåðìèíàòèâíûõ êëåòîê ó æåíñêèõ ýìáðèîíîâ, ÷òî ïðèâîäèò ê îáðàçîâàíèþ ÿéöåêëåòîê. Âûäåëåí ôåðìåíò, èìåþùèéñÿ ó ìóæñêèõ ýìáðèîíîâ, êîòîðûé ðàçðóøàåò ðåòèíîåâóþ êèñëîòó, è òàêèì îáðàçîì, ïîäàâëÿåò ìåéîç äî ðîæäåíèÿ, â ðåçóëüòàòå èç ãåðìèíàòèâíûõ êëåòîê ðàçâèâàþòñÿ ñïåðìàòîçîèäû. Çíàíèå òðèããåðîâ è ñóïðåññîðîâ ìåéîçà, ìîæåò ïîìî÷ü ó÷¸íûì â ðàçðàáîòêå íîâûõ ìåòîäîâ ëå÷åíèÿ áåñïëîäèÿ, ðàêà ÿè÷åê, à òàêæå â áîðüáå ñ íàñåêîìûìè-âðåäèòåëÿìè. Èñòî÷íèê: biologynews.netêàòåãîðèÿ - 1
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