Two splice variants of the IDD14 transcription factor competitively form nonfunctional heterodimers which may regulate starch metabolism

Pil Joon Seo, Mi Jung Kim, Jae-Yong Ryu, Eun-Young Jeong and Chung-Mo Park ()
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Pil Joon Seo: Seoul National University
Mi Jung Kim: Seoul National University
Jae-Yong Ryu: Seoul National University
Eun-Young Jeong: Seoul National University
Chung-Mo Park: Seoul National University

Nature Communications, 2011, vol. 2, issue 1, 1-8

Abstract: Abstract Alternative splicing of primary gene transcripts provides eukaryotic cells, with a critical scheme for enriching transcriptome and proteome diversity. Here we report that alternative splicing of the Arabidopsis INDERMINATE DOMAIN 14 (IDD14) transcription factor gene generates a competitive inhibitor in regulating starch metabolism. An alternatively spliced IDD14 form (IDD14β), which is produced predominantly under cold conditions, lacks functional DNA-binding domain but is able to form heterodimers with the functional IDD14 form (IDD14α). IDD14α–IDD14β heterodimers have reduced binding activity to the promoter of Qua-Quine Starch (QQS) gene that regulates starch accumulation. Transgenic Arabidopsis plants overproducing IDD14α (35S:IDD14α) exhibited retarded growth with pale green leaves as appeared on QQS-overexpressing plants. Notably, IDD14β overproduction rescued the 35S:IDD14α phenotypes. We propose that alternative splicing of the IDD14 gene generates a self-controlled regulatory loop that may modulate starch accumulation in response to cold.

Date: 2011
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DOI: 10.1038/ncomms1303

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