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Dennis Welker

Profile Picture

Molecular genetics of lactic acid bacteria

Professor & Director of Undergraduate Studies - Biology Department

Professor

Contact Information

Office Location: BNR 101
DialPhone: 435-797-3552
SendEmail: dennis.welker@usu.edu


Educational Background

PhD, Biophysics, Pennsylvania State University, 1977
MS, Biophysics, Pennsylvania State University, 1976
BA, Physics, Shippensburg State University, 1973

Biography

Microbial molecular geneticist with experience with bacterial, fungal, and cellular slime mold species


Teaching Interests

Genetics and Society Molecular Genetics Biology Professions Health Professions Internship/Co-op

Research Interests

Genetic analyses of lactic acid bacteria Phylogenetics of Ascosphaera fungi Bee transcriptomics

Awards

Oustanding New Faculty Advisor, 2005

National Academic Advising Association

Outstanding New Faculty Advisor, 2005

USU

Undergraduate Research Mentor of the Year, 2003

USU College of Science

Publications - Abstracts

    Publications - Books & Book Chapters

      * Has not been peer reviewed

      Publications - Fact Sheets

        * Has not been peer reviewed

        Publications - Curriculum

          * Has not been peer reviewed

          Publications - Journal Articles

            Academic Journal

          • Welker, D.L, Hughes, J.E, Steele, J.L, Broadbent, J.R, (2015). High efficiency electrotransformation of Lactobacillus casei. FEMS Microbiol. Lett., 362, 1-6. doi: 10.1093/femsle/fnu033
          • Klinger, E.G, Vojvodic, S., DeGrandi-Hoffman, G., Welker, D.L, James, R.R, (2015). Mixed infections reveal virulence differences between host-specific bee pathogens. Journal of Invertebrate Pathology, 129, 28-35.
          • Broadbent, J.R, Oberg, T.S, Hughes, J.E, Ward, R.E, Brighton, C., Welker, D.L, Steele, J.L, (2014). Influence of polysorbate 80 and cyclopropane fatty acid synthase activity on lactic acid production by Lactobacillus casei ATCC 334 at low pH.. Journal of industrial microbiology & biotechnology, 41, 545-553. doi: 10.1007/s10295-013-1391-2
          • Broadbent, J.R, Hughes, J.E, Welker, D.L, Tompkins, T., Steele, J.L, (2013). Complete genome sequence for Lactobacillus helveticus CNRZ 32, a commercial cheese starter and cheese flavor adjunct. Genome Announc, 1, e00590-13.
          • Cefalo, A.D, Broadbent, J.R, Welker, D.L, (2013). Streptococcus thermophilus Wzh functions as a phosphotyrosine phosphatase. Can. J. Microbiol, 59, 391-398.
          • Cefalo, A.D, Broadbent, J.R, Welker, D.L, (2011). Intraspecific and interspecific interactions among proteins regulating exopolysaccharide synthesis in Streptococcus thermophilus, Streptococcus iniae, and Lactococcus lactis ssp. cremoris and the assessment of potential lateral gene transfer.. Can. J. Microbiol., 57, 1002-1015.
          • Broadbent, J.R, Cai, H., Larsen, R.L, Hughes, J.E, Welker, D.L, De Carvallo, V.G, Thompkins, T.A, Ardo, Y., Vogensen, F., DeLorentiis, A., Gatti, M., Neviani, E., Steele, J.L, (2011). Genetic diversity in proteolytic enzymes and amino acid metabolism among Lactobacillus helveticus strains.. J. Dairy Sci., 94, 4313-4328.
          • Cefalo, A.D, Broadbent, J.R, Welker, D.L, (2011). Protein-protein interactions among the components of the biosynthetic machinery responsible for exopolysaccharide production in Streptococcus thermophilus MR-1C. J. Appl. Microbiol., 110, 801-812.
          • Hagen, K.E, Tramp, C.A, Altermann, E., Welker, D.L, Tompkins, T.A, (2010). Sequence analysis of plasmid pIR52-1 from Lactobacillus helveticus R0052 and investigation of its method of replication. Plasmid, 63, 108-117.
          • Christiansen, J.K, Hughes, J.E, Welker, D.L, Rodriguez, B.T, Steele, J.L, Broadbent, J.R, (2008). Phenotypic and Genotypic analysis of amino acid auxotrophy in Lactobacillus helveticus CNRZ32. Applied and Environmental Microbiology, 74, 416-423.
          • Makarova, K., Slesarev, A., Wolf, Y., Sorokin, A., Mirkin, B., Koonin, E., Pavlov, A., Pavlova, N., Karamychev, V., Polouchine, N., Shakhova, V., Grigoriev, I., Lou, Y., Rohksar, D., Lucas, S., Huang, K., Goodstein, D.M, Hawkins, T., Plengvidhya, V., Welker, D.L, Hughes, J., Goh, Y., Benson, A., Baldwin, K., Lee, J., Diaz-Muniz, I., Dosti, B., Smenianov, V., Wechter, W., Barabote, R., Lorca, G., Altermann, E., Barrangou, R., Ganesan, B., Xie, Y., Rawsthorne, H., Tamir, D., Parker, C., Breidt, F., Broadbent, J., Hutkins, R., O'Sullivan, D., Steele, J., Unlu, G., Saier, M., Klaenhammer, T., Richardson, P., Kozyavkin, S., Weimer, B., Mills, D., (2006). Comparative genomics of the lactic acid bacteria. PNAS, 103, 15611-15616.
          • Welker, D.L, (2005). Identification of endopeptidase genes from the genomic sequence of Lactobacillus helveticus CNRZ32 and the role of these genes in hydrolysis of model bitter peptides. Applied and Environmental Microbiology , 71, 3025-3032.
          • Welker, D.L, (2003). Streptococcus thermophilus exopolysaccharide biochemistry, genetics, and applications of exopolysaccharide production in Streptococcus thermophilus: a review. Journal of Dairy Science, 86, 407-423.
          • Broadbent, J.R, McMahon, D.J, Oberg, C.J, Welker, D.L, (2001). Use of exopolysaccharide- producing cultures to improve the functionality of low fat cheese. International Dairy Journal, 11, 433-439.
          • Broadbent, J.R, McMahon, D.J, Oberg, C.J, Welker, D.L, (2001). Use of exopolysaccharide-producing cultures to improve the functionality of low fat cheese.. Int. Dairy J., 11, 433-439.
          • Professional Journal

          • Klinger, E.G, Welker, D.L, James, R.R, Youssef, N.N, (2013). A multi-gene phylogeny provides insight into the relationships among Ascosphaera species. Journal of Invertebrate Pathology, 112, 41-48.
          • Jensen, A., Welker, D.L, Kryger, P., James, R., (2012). Polymorphic DNA sequences of the fungal honey bee pathogen Ascosphaera apis. FEMS Microbiology Letters, 330, 17-22.

          * Has not been peer reviewed

          Publications - Literary Journal

            * Has not been peer reviewed

            Publications - MultiMedia

              * Has not been peer reviewed

              Publications - Technical Reports

                * Has not been peer reviewed

                Publications - Translations & Transcripts

                  Publications - Other

                    * Has not been peer reviewed

                    Scheduled Teaching

                    BIOL 1050 - Biology Professions, Fall 2016

                    BIOL 4250 - Internship/Co-op, Fall 2016

                    BIOL 1060 - Prehealth Professions, Fall 2016

                    BIOL 3030 - Genetics and Society, Spring 2015

                    BIOL 4250 - Internship/Co-op, Spring 2015

                    BIOL 5190,6190 - Molecular Genetics, Spring 2015

                    BIOL 1050 - Biology Professions, Fall 2014

                    BIOL 4250 - Internship/Co-op, Fall 2014

                    BIOL 1060 - Prehealth Professions, Fall 2014

                    BIOL 3030 - Genetics and Society, Spring 2014

                    BIOL 4250 - Internship/Co-op, Spring 2014

                    BIOL 4250 - Internship/Co-op, Fall 2013

                    BIOL 1750 - Topics in Biology, Fall 2013

                    BIOL 1750 - Topics in Biology, Fall 2013

                    BIOL 4250 - Internship/Co-op, Summer 2013

                    BIOL 3030 - Genetics and Society, Spring 2013

                    BIOL 4250 - Internship/Co-op, Spring 2013

                    BIOL 5190,6190 - Molecular Genetics, Spring 2013

                    BIOL 4250 - Internship/Co-op, Fall 2012

                    BIOL 1750 - Topics in Biology, Fall 2012

                    BIOL 1750 - Topics in Biology, Fall 2012

                    BIOL 4250 - Internship/Co-op, Summer 2012

                    BIOL 3030 - Genetics and Society, Spring 2012

                    BIOL 4250 - Internship/Co-op, Spring 2012

                    BIOL 4250 - Internship/Co-op, Fall 2011

                    BIOL 1750 - Topics in Biology, Fall 2011

                    BIOL 1750 - Topics in Biology, Fall 2011

                    BIOL 4250 - Internship/Co-op, Summer 2011

                    BIOL 3030 - GENETICS & SOCIETY (DSC), Spring 2011

                    BIOL 1750 - Topics in Biology (Topic), Fall 2010


                    Graduate Students Mentored

                    Ellen Klinger, Biology, September 2010 - May 2015
                    Angela Cefalo, Biology, September 2001 - August 2012
                    Hassan Ashktorab, Biology, September 1983 - May 1987