Studiind o tulpină de drojdie care prezintă multe similarităţi genetice cu celula umană, oamenii de ştiinţă au descoperit că alcoolul şi cafeaua acţionează asupra unor componente ale ADN-ului implicat în îmbătrânire şi apariţia cancerului. Componentele afectate sunt telomerele – capetele lanţurilor de ADN şi proteine din cromozomi – a căror lungime este corelată cu procesul de îmbătrânire şi cu riscul de apariţie a bolilor canceroase, potrivit descopera.ro. Telomerele joacă un rol important în viaţa celulei: ele asigură acurateţea procesului de copiere şi reparare a ADN. De fiecare dată când o celulă se divide, ADN-ul este copiat în celulele-fiice cu telomere puţin mai scurte. În cele din urmă, telomerele devin prea scurte, iar atunci celula moare. Cercetătorii de la Universitatea din Tel Aviv (Israel) şi Univ. Columbia (SUA) au descoperit că alcoolul duce la creşterea lungimii telomerelor, iar cafeina determină scurtarea acestora. Rezultatele experimentelor au fost publicate în PLOS Genetics.
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