Required for the induction of seed dormancy (PubMed:17065317, PubMed:26620523, PubMed:22829147). The level of DOG1 protein in freshly harvested seeds determines the level of seed dormancy (PubMed:22829147). Determines the temperature window for germination by regulating the expression of micropylar endosperm-weakening genes through temperature control of the gibberellins metabolism (PubMed:25114251). Regulates seed dormancy and flowering time through an influence on levels of microRNAs miR156 and miR172 (PubMed:27035986). Regulator of seed maturation interfering with abscisic acid signaling components and activating ABI5 (PubMed:26729600). In cv. Cvi-1, enhances glucose induction of ABI4 (PubMed:18410483). Homodimer (PubMed:26684465). Self-binding does not influence protein accumulation but is required for full function (PubMed:26684465). Single isoforms are functional, but the presence of additional isoforms is required to prevent protein degradation (PubMed:26684465). A number of isoforms are produced. Detected only in seeds (PubMed:17065317). Expressed mainly in vascular tissues of the cotyledon, hypocotyl and radicle of the embryo. Isoform 1 and isoform 2: Transcription starts at the beginning of seed maturation 9 days after pollination and reaches its highest level during the last phases of seed development (PubMed:26620523, PubMed:17065317, PubMed:22829147). Isoform 1: Upon imbibition the transcripts rapidly disappear in both dormant and after-ripened seeds, but the level of protein is hardly affected (PubMed:17065317, PubMed:22829147). Isoform 2: Transcription starts at the beginning of seed maturation 9 days after pollination and reaches its highest level during the last phases of seed development (PubMed:26620523). Up-regulation by glucose of the Cvi-1 allele, but not of the Columbia and Landsberg erecta alleles (PubMed:18410483). May be up-regulated by the transcript elongation factor TFIIS (PubMed:21569772). Up-regulated by cold (PubMed:21803937, PubMed:22829147). Up-regulated by histone monoubiquitination through HUB1 (PubMed:17329563). Down-regulated by the histone demethylases LDL1 and LDL2 (PubMed:25852712). A shift in isoelectric focusing of the protein occurs during after-ripening, probably leading to its loss of function. Loss of seed dormancy, but no effect on sugar sensitivity (in cv. Columbia) (PubMed:17065317, PubMed:18410483). A T-DNA insertion mutant lacking the long version of the DOG1 transcript (isoform 1) but expressing isoform 2 exhibits stronger seed dormancy (PubMed:26620523). The Columbia and Landsberg erecta alleles have weak dormancy phenotypes, whereas the Cvi-1 allele shows a strong dormancy phenotype (PubMed:17065317). The Cvi-1 allele shows a sugar-supersensitive phenotype, whereas the Columbia and Landsberg erecta alleles don't have a significant effect on sugar sensitivity (PubMed:18410483). Transgenic mutant seeds expressing single DOG1 transcript variants lack dormancy and do not accumulate DOG1 protein. Simultaneous expression of two or more DOG1 transcript variants encoding different isoforms, however, leads to the accumulation of DOG1 protein and increased seed dormancy (PubMed:26684465). The spliceosome disassembly factor STIP1/NTR1 is required for proper transcript levels and splicing of DOG1 (PubMed:25568310). The use of a proximal polyadenylation site leads to the production of a short DOG1 mRNA that is translated in vivo, producing an isoform that is sufficient for seed dormancy establishment. Produced by alternative polyadenylation.