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He Yuehui's group reveals the molecular mechanism of "vernalization memory" reset and gene expression reprogramming in plant embryos

 Last Update: 2022-04-27
 Source: Internet
 Author: User

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On March 2 ,

Eukaryotic gene expression is regulated by epigenetic mechanisms such as chromatin modification and remodeling

Previous research by He Yuehui's team found that during seedling vernalization, the B3 domain proteins VAL1 and VAL2 recognize Cold Memory Element (CME ) DNA elements at the FLC site , recruit the Polycomb protein complex ( PRC2 ) and silence FLC expression (Yuan et al.

The newly published study found that in late embryonic development, the B3 domain transcription factor ABI3 recognizes CME sequences and recruits a supercomplex composed of the scaffold protein FRIGIDA (FRI) and activating chromatin modifiers ( FRIc ), which are stained in FLC .

Figure 1 The sequential expression of seed-specific LAFL genes forms a molecular pathway for "vernalization memory" reset and FLC reactivation ( https://doi.

This study, along with previous work by the team, revealed a critical role for the seed-specific LAFL gene regulatory network ( LEC1 , LEC2 , FUS3 and ABI3 ) in resetting "vernalized memory" .

Figure 2 The mechanism of reset of FLC chromatin silencing state and FLC reactivation during seed development ( https://doi.

Dr.

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