Асинхронная репликация у онкологических больных

Эпигенетика – наука об обратимых наследственных изменениях функционирования гена, которые происходят без изменений в нуклеотидной последовательности ДНК. Один из важнейших маркеров нарушений эпигенетической регуляции генома клетки – асинхронность репликации ДНК биаллельно экспрессирующихся генов. Удобным методом оценки нарушения синхронности репликации (асинхронной репликации) в культивированных лимфоцитах периферической крови человека, как правило, является интерфазная флуоресцентная in situ гибридизация (I-FISH). В обзоре проведен анализ работ, направленных на изучение асинхронной репликации биаллельно экспрессирующихся генов в лимфоцитах периферической крови онкологических больных. Этот анализ показал, что асинхронная репликация – неспецифический маркер злокачественных новообразований и наблюдается как у онкогематологических больных, так и у пациентов с солидными опухолями, причем не только в клетках опухоли, но и в лимфоцитах периферической крови. Проведенный анализ продемонстрировал, что встречаемость лимфоцитов с асинхронной репликацией изученных генов у онкологических больных достоверно повышена по сравнению со здоровыми лицами и увеличивается в процессе малигнизации (злокачественного перерождения) заболеваний. Это дает потенциальную возможность использовать асинхронную репликацию как молекулярно-генетический маркер для раннего выявления лиц с онкологическими заболеваниями.

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