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| SUB1A | |
|---|---|
| Name | SUB1A |
| Organism | Oryza sativa |
| Locus | Submergence tolerance locus |
| Synonyms | Sub1A-1, Sub1A allele |
SUB1A SUB1A is a plant gene found in rice varieties that confers tolerance to prolonged flooding through transcriptional control of stress responses. It encodes an ethylene response factor (ERF) family transcription factor and was discovered via genetic mapping of submergence-tolerant cultivars and positional cloning in agronomic studies. SUB1A has been central to translational research in crop improvement, featuring in field trials, breeding programs, and molecular studies across institutions and international initiatives.
SUB1A was identified during linkage analyses of quantitative trait loci by teams working with varieties from the International Rice Research Institute, the Rockefeller University, the University of California, and collaborators in Bangladesh. The discovery intersected work on QTL mapping, map-based cloning, and functional characterization using transgenic approaches at institutions such as IRRI, the University of Oxford, and the John Innes Centre. Subsequent publications appeared in prominent journals and were discussed at conferences including the Plant and Animal Genome Conference and meetings organized by the Bill & Melinda Gates Foundation.
The SUB1A locus resides within a chromosomal region mapped by using markers from the Oryza sativa genome assembly produced by the International Rice Genome Sequencing Project and analyzed against databases maintained by the National Center for Biotechnology Information and the European Bioinformatics Institute. The gene encodes a protein of the AP2/ERF superfamily with a conserved AP2 DNA-binding domain seen in proteins characterized by groups led by researchers at the Max Planck Institute, Cold Spring Harbor Laboratory, and Harvard University. Structural features include an N-terminal AP2 domain and motifs involved in transcriptional regulation, comparable to domains cataloged in UniProt and Pfam. Comparative protein modeling has drawn on structural studies from the Protein Data Bank used by groups at MIT, Stanford, and ETH Zurich.
Expression studies employing RNA extraction protocols developed at Rockefeller University, quantitative RT-PCR assays refined at Kyoto University, and RNA-Seq pipelines from the European Molecular Biology Laboratory showed that SUB1A is induced by ethylene signaling pathways characterized in classic studies from the Salk Institute and the Max Planck Institute for Plant Breeding Research. Promoter analyses involving reporter constructs used by laboratories at Wageningen University and Nagoya University identified cis-elements responding to hypoxia and hormone cues characterized in work at Yale University and Princeton University. Regulation involves interaction with signaling components studied in pathways described by researchers at the University of Cambridge and University of California, Davis.
Functional assays in transgenic lines generated in facilities at IRRI, the University of California, Berkeley, and Tsukuba demonstrated that SUB1A modulates carbohydrate metabolism and growth by restraining shoot elongation during submergence, a mechanism analogized to energy-conservation strategies described in studies from Johns Hopkins University and the University of Chicago. Chromatin immunoprecipitation experiments adapted from protocols at the EMBL mapped target promoters including genes involved in gibberellin response pathways investigated by teams at the University of Tokyo and the University of Minnesota. Protein–protein interaction studies utilized yeast two-hybrid systems pioneered at Cold Spring Harbor and co-immunoprecipitation strategies practiced at the Karolinska Institutet.
SUB1A-mediated tolerance to flooding has been evaluated in field trials coordinated by IRRI, the International Center for Tropical Agriculture, the Bangladesh Rice Research Institute, and national agricultural research systems. Field data compared SUB1A-containing lines against cultivars studied during cyclone recovery programs in regions documented by the United Nations Food and Agriculture Organization and national ministries of agriculture. Beyond submergence, SUB1A influences cross-talk with pathogen-response pathways involving salicylic acid and jasmonic acid signaling networks described in foundational work at The Scripps Research Institute, Cornell University, and Rockefeller University; these interactions affect susceptibility and resistance phenotypes examined in pathosystems characterized by researchers at the John Innes Centre and Wageningen University.
Breeding programs incorporating SUB1A used marker-assisted selection techniques developed at IRRI, CIMMYT, and the Consultative Group on International Agricultural Research, deploying introgression into popular cultivars monitored by national seed systems in India, Bangladesh, and the Philippines. Biotechnological deployment included transgenic expression studies performed under regulatory frameworks informed by analyses from the World Bank and regulatory agencies such as the United States Department of Agriculture and the European Food Safety Authority. Socioeconomic impact assessments referenced work by economists at the International Food Policy Research Institute and adoption studies led by universities including Michigan State University and the University of Reading.
Comparative genomics studies contrasted the SUB1A locus with orthologs and paralogs in Oryza species cataloged by the Oryza Map Alignment Project and with AP2/ERF family members characterized across plant genomes sequenced by the Arabidopsis Genome Initiative and the Broad Institute. Phylogenetic analyses drew on methods used by researchers at the Smithsonian Institution, the National Evolutionary Synthesis Center, and the University of California system to trace diversification among cereals, including comparisons with Triticum, Zea mays, and Hordeum genes studied at CIMMYT and the John Innes Centre. Conservation patterns were interpreted in light of domestication research from institutions such as Stanford University and the University of Wisconsin.
Category:Plant genes