Sue Gibson
Office Address

1500 Gortner Avenue
St. Paul, MN 55108
United States



Plant and Microbial Biology

My research interests include molecular genetics; isolation and characterization of plant mutants defective in the ability to respond to soluble sugar levels; regulation of source-sink interactions, manipulation of indole alkaloid metabolism to increase production of anti-cancer agents; eQTL analysis of soybean composition and yield.

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Research interests

Our lab is taking a molecular-genetic approach to investigating the role of endogenous sugar levels in regulating plant gene expression and development. Sugars may be considered to be similar to hormones in that they are synthesized in one part of the plant and then transported to other parts of the plant where they affect gene expression, time of flowering, early seedling development and other plant processes. To learn more about the role of soluble sugar levels in regulating plant development, and to identify the signal transduction pathways between sugar and gene expression, we isolated mutants of Arabidopsis thaliana that are defective in their response to sugar. Currently, we are focusing our efforts on the sis3, sis8 and hac1 mutants that carry mutations in an ubiquitin e3 ligase, a protein kinase and a histone acetyl transferase, respectively. In addition to addressing basic scientific questions, a long-term goal of our research is to engineer more productive plants by altering the way that plants respond to sugar in order to manipulate source-sink interactions.

A second project in our lab is aimed at using genetic engineering to increase the levels of two anti-cancer agents, vincristine and vinblastine, in C. roseus (periwinkle).

A third project in our lab focuses on identifying soybean expression quantitative trait loci (eQTL) that are involved in controlling seed yield or composition.

Selected publications

Huang, Y., Li, C.Y., Pattison, D.L., Gray, W., Park, S., and Gibson, S.I. (2010). SUGAR INSENSITIVE3, a RING E3 ligase, is a new player in plant sugar response. Plant Physiol. 152, 1889-1900.

Huang, Y., Li, C.Y., Biddle, K.D., and Gibson, S.I. (2008). Identification, cloning and characterization of sis7 and sis10 sugar-insensitive mutants of ArabidopsisBMC Plant Biol. 8, 104.

Peebles, C.A.M., Gibson, S.I., Shanks, J.V., and San, K.-Y. (2007). Long-term maintenance of a transgenic Catharanthus roseus hairy root line. Biotechnol. Prog. 23, 1517-1518.

Peebles, C.A.M., Gibson, S.I., Shanks, J.V., and San, K.-Y. (2007). Characterization of an ethanol-inducible promoter system in Catharanthus roseus hairy roots. Biotechnol. Prog. 23, 1258-1260.

Hong, S.-B., Peebles, C.A.M., Shanks, J.V., San, K.-Y., and Gibson, S.I. (2006). Terpenoid indole alkaloid production by Catharanthus roseus hairy roots induced by Agrobacterium tumefaciens harboring rol ABC genes. Biotechnol. Bioeng. 93, 386-390.

Hong, S.-B., Peebles, C.A.M., Shanks, J.V., San, K.-Y., and Gibson, S.I. (2006). Expression of the Arabidopsis feedback-insensitive anthranilate synthase holoenzyme and tryptophan decarboxylase genes in Catharanthus roseus hairy roots. J. Biotechnol. 122, 28-38.

Peebles, C.A.M., Hong, S.-B., Gibson, S.I., Shanks, J.V., and San, K.-Y. (2006). Effects of terpenoid precursor feeding on Catharanthus roseus hairy roots over-expressing the alpha or the alpha and beta subunits of anthranilate synthase. Biotechnol Bioeng 93, 534-540.

Peebles, C.A.M., Hong, S.-B., Gibson, S.I., Shanks, J.V., and San, K.-Y. (2005). Transient effects of over-expressing anthranilate synthase alpha and beta subunits in Catharanthus roseus hairy roots. Biotech. Prog. 21, 1572-1576.

Gibson, S.I. (2005). Control of plant development and gene expression by sugar signaling. Curr. Opin. Plant Biol93-102.

Gibson, S.I. (2004). Sugar and phytohormone response pathways: navigating a signaling network. J. Exp. Bot55 253-264.

Hughes, E.H., Hong, S.B., Gibson, S.I. , Shanks, J.V. and San, K.Y. (2004). Expression of a feedback-resistant anthranilate synthase in Catharanthus roseus hairy roots provides evidence for tight regulation of terpenoid indole alkaloid levels. Biotechnol. Bioeng86 718-727.

Hughes, E.H., Hong, S.B., Gibson, S.I. , Shanks, J.V. and San, K.Y. (2004). Metabolic engineering of the indole pathway in Catharanthus roseus hairy roots and increased accumulation of tryptamine and serpentine. Metab. Eng268-276.

Hong, S.-B., Hughes, E.H., Shanks, J.V., San, K.-Y. and Gibson, S.I. (2003). Role of the non-mevalonate pathway in indole alkaloid production by Catharanthus roseus hairy roots. Biotechnol. Prog19 1105-1108.

To, J.P.C., Reiter, W.-D. and Gibson, S.I. (2003). Chloroplast biogenesis by Arabidopsis seedlings is impaired in the presence of exogenous glucose. Physiol. Plant118 456-463.

Finkelstein, R.R. and Gibson, S.I. (2002). ABA and sugar interactions regulating development: cross-talk or voices in a crowd? Curr. Opin. Plant Biol26-32.

Hughes, E.H., Hong, S.-B., San, K.-Y., Shanks, J.V. and Gibson, S.I. (2002). Characterization of an inducible promoter system in Catharanthus roseus hairy roots. Biotech. Prog18 1183-1186.

To, J.P.C., Reiter, W.-D. and Gibson, S.I. (2002). Mobilization of seed storage lipid by Arabidopsis seedlings is retarded in the presence of exogenous sugars. BMC Plant Biol4.

Gibson, S.I. , Laby, R.J. and Kim, D. (2001). The sugar-insensitive1 sis1 ) mutant of Arabidopsis is allelic to ctr1 Biochem. Biophys. Res. Commun280 196-203.

Laby, R.J., Kim, D. and Gibson, S.I. (2001). The ram1 mutant of Arabidopsis exhibits severely decreased -amylase activity. Plant Physiol127 1798-1807.

Chia, D.W., Yoder, T.J., Reiter, W.-D. and Gibson, S.I. (2000). Fumaric acid: an overlooked form of fixed carbon in Arabidopsis and other plant species. Planta211 743-751.

Gibson, S.I. (2000). Plant sugar-response pathways. Part of a complex regulatory web. Plant Physiol.124 1532-1539.

Laby, R.J., Kincaid, M.S., Kim, D. and Gibson, S.I. (2000). The Arabidopsis sugar-insensitive mutants sis4 and sis5 are defective in abscisic acid synthesis and response. Plant J.23 587-596.

Gibson, S.I. and Graham, I.A. (1999). Another player joins the complex field of sugar-regulated gene expression in plants. Proc. Natl. Acad. Sci. USA96 4746-4748.