The Molecular Choreography Behind Flowering<\/strong><\/p>\n Since timing is so critical, plants need to know when to flower. How do they do that? They cannot keep a calendar, but they rely on environmental signals \u2013 especially temperature and day length \u2013 to activate the processes that lead to flowering.<\/p>\n Inside the plant, these cues become a complex molecular dialogue to determine when the timing is right. This dialogue involves many actors, including proteins<\/strong>: molecules transcribed from DNA into RNA before being assembled into amino\u2011acid chains. They then fold into functional shapes that carry out many roles.<\/p>\n For flowering, two of these proteins are especially important:<\/p>\n This system, while very complex in nature, is essentially a molecular version of \u201cWhen the cat\u2019s away, the mice will play.\u201d FLC is the cat: once its activity drops, FT \u2013 the mice \u2013 can be on the move. But proteins aren\u2019t the only voices in this story. RNA molecules<\/strong> \u2013 nucleic\u2011acid strands best known as intermediates between DNA and protein \u2013 also influence when the cat quiets down. One of these, called COOLAIR, helps modulate FLC\u2019s activity. Let\u2019s see how.<\/p>\n The Winter Movement: Vernalization and COOLAIR<\/strong><\/p>\n To understand COOLAIR\u2019s role, we first need to look at how the FLC brake is lifted. It doesn\u2019t happen instantly; the cat doesn\u2019t slip out the door suddenly. It is removed gradually over weeks of winter, thanks to a process called vernalization<\/strong>. Vernalization is the plant\u2019s requirement for a prolonged period of cold to unlock the flowering program: a way of confirming that enough winter has passed. Since the break lifts slowly, the plant isn\u2019t fooled by a brief return of mild weather in the middle of winter. Quite smart, isn\u2019t it?<\/p>\n And this is where COOLAIR comes in<\/strong>. Vernalization sets off a series of molecular adjustments that accumulate over weeks of cold, including the production of an RNA molecule called COOLAIR, to help register that winter is underway [4]. While, many RNA molecules act as protein-coding messages, telling the cell which proteins to make, COOLAIR is a non\u2011coding RNA<\/strong>, which doesn\u2019t make proteins at all. For years, these non-coding molecules were dismissed \u2013 but we now know they can play key regulatory roles. In COOLAIR\u2019s case, that includes helping silence the FLC gene [5, 6].<\/p>\n The Fold Is the Instruction<\/strong><\/p>\n Knowing that COOLAIR helps regulate FLC is one thing \u2013 understanding how it does it is another. Recent advances in RNA\u2011analysis techniques reveal that it involves the RNA structure<\/strong> itself.<\/p>\n Like origami, RNA molecules twist and bend into intricate shapes that determine how they interact with other molecules. What researchers have uncovered is striking: in response to sustained cold, COOLAIR folds into specific structures that allow it to bind near the FLC gene and gradually silence it [7].<\/p>\n COOLAIR is only one example: it\u2019s increasingly clear that RNA molecules across the cell carry hidden layers of information in their shapes, and the more closely we examine them, the more unexpected instructions we are likely to find. It\u2019s an exciting new field, with many mechanisms still to uncover.<\/p>\n COOLAIR is the plant\u2019s tiny archivist of winter \u2013 folding, refolding, and keeping count until spring can safely begin. When Jean Combes watched the trees outside her door, she revealed a world in motion: COOLAIR reveals part of the machinery beneath that motion. Both remind us that even the smallest observations can help us understand how our climate is changing, and how organisms are trying to adapt.<\/p>\n <\/p>\n Am\u00e9lie Allard<\/strong><\/p> Am\u00e9lie Allard is a master\u2019s student in biochemistry in the laboratory of Prof. Zo\u00e9 Joly\u2011Lopez at UQAM. Her research focuses on how RNA structures change in response to high\u2011temperature stress in rice, with the goal of making plants more resilient to climate change.<\/p>\n<\/div><\/div><\/div>\n <\/p>\n References:<\/strong><\/p>\n [1] Combes J. Jean Combes obituary. The Guardian. 2023 Sep 24. Available from: https:\/\/www.theguardian.com\/environment\/2023\/sep\/24\/jean-combes-obituary From the age of twenty until her death at ninety\u2011six in 2023, an English woman, Jean Combes, noted the date of first bud opening in four tree species every spring [1]. Her 76 years of records, combined with more than 400,000 citizen observations across 400 plant species, enabled a Cambridge research team to show that, […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3055","post","type-post","status-publish","format-standard","hentry"],"acf":[],"yoast_head":"\n\n
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\n[2] B\u00fcntgen, U., Piermattei, A., Krusic, P. J., Esper, J., Sparks, T., & Crivellaro, A. (2022). Plants in the UK flower a month earlier under recent warming. Proceedings of the Royal Society B, 289(1968), 20212456.
\n[3] Memmott, J., Craze, P. G., Waser, N. M., & Price, M. V. (2007). Global warming and the disruption of plant\u2013pollinator interactions. Ecology letters, 10(8), 710-717.
\n[4] Zhao, Y., Zhu, P., Hepworth, J., Bloomer, R., Antoniou-Kourounioti, R. L., Doughty, J., … & Dean, C. (2021). Natural temperature fluctuations promote COOLAIR regulation of FLC. Genes & Development, 35(11-12), 888-898.
\n[5] Csorba, T., Questa, J. I., Sun, Q., & Dean, C. (2014). Antisense COOLAIR mediates the coordinated 4 switching of chromatin states at FLC during vernalization. Proceedings of the National Academy of Sciences, 111(45), 16160-16165.
\n[6] Whittaker, C., & Dean, C. (2017). The FLC locus: a platform for discoveries in epigenetics and adaptation. Annual review of cell and developmental biology, 33, 555-575.
\n[7] Yang, M., Zhu, P., Cheema, J., Bloomer, R., Mikulski, P., Liu, Q., … & Ding, Y. (2022). In vivo single-molecule analysis reveals COOLAIR RNA structural diversity. Nature, 609(7926), 394-399.<\/p>\n","protected":false},"excerpt":{"rendered":"