Реконструкция и анализ регуляторной генной сети функционирования клеточной стенки листьев Arabidopsis thaliana L. при ответе на водный дефицит

Растительная клеточная стенка представляет собой внешний компартмент растительной клетки, который во многом обеспечивает физический барьер и запуск сигнальных каскадов при действии био- и абиотических стрессоров. Засуха негативно влияет как на рост, так и развитие растений. Белки клеточной стенки (БКС) играют существенную роль в ответе растений на водный дефицит. Механизмы адаптации клеточной стенки к потере воды могут быть использованы для выявления важных генетических факторов, определяющих устойчивость растений к засухе, и предоставляют ценные данные о биомаркерах для дальнейшей селекции, направленной на повышение урожайности культурных растений. С помощью ANDSystem реконструирована генная сеть, позволяющая описывать регуляцию БКС в условиях ограничения полива. Анализ генной сети совместно с анализом транскриптомных данных позволил провести приоритизацию транскрипционных факторов (ТФ) по их обогащенности регулируемыми дифференциально экспрессирующимися генами. В результате были рассчитаны веса, являющиеся индикаторами ассоциации ТФ с водным дефицитом. По значениям весов отобраны восемь наиболее значимых ТФ. Наибольшим приоритетом обладал ТФ GBF3. Приоритизация БКС проведена по критерию суммирования весов транскрипционных факторов, регулирующих эти гены. К наиболее приоритетным БКС отнесены ген AT5G03350, кодирующий лектин-подобный белок; AT4G20860, кодирующий фермент берберинового моста BBE-like 22 (berberine bridge enzyme-like 22), необходимый для окисления продуктов распада целлюлозы, и AT4G37800, кодирующий ксилоглюкан эндотрансгликозилазу/гидролазу 7.

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