Peer-Reviewed Publications ---also see Google Scholar link: [ Google Scholar]
# Graduate Student, ## Undergraduate Student, ### Postdoctoral Scholar Accepted: Younghwan Kwak#, Allison K. Hansen. Accepted. Unveiling Metabolic Integration in Psyllids and Their Nutritional Endosymbionts through Comparative Transcriptomics Analysis. iScience. in press
Jacob Argondona##, Dohyup Kim#, Allison K. Hansen. 2023. Comparative Transcriptomics of aphid species that diverged >22 MYA reveals genes that are important for the maintenance of their symbiosis. Scientific Reports.13, 5341 (2023). https://doi.org/10.1038/s41598-023-32291-3
Younghwan Kwak#, Jacob Argondona##, Patrick H. Degnan, Allison K. Hansen. 2023. Chromosomal-level assembly of Bactericera cockerelli reveals rampant gene family expansions impacting genome structure, function and insect-microbe-plant-interactions. Molecular Ecology Resources. Mol Ecol Resour. 2023 Jan;23(1):233-252. doi: 10.1111/1755-0998.13693. Epub 2022 Aug 16. PMID: 35925827.
Allison K. Hansen, Ariana Sanchez##, Younghwan Kwak#. 2022. Divergent host-microbe interaction and pathogenesis proteins detected in recently identified Liberibacter species. Microbiology Spectrum. Aug 31;10(4):e0209122. doi: 10.1128/spectrum.02091-22. Epub 2022 Jul 28. PMID: 35900091; PMCID: PMC9430466. Mackenzie Patton, Allison K. Hansen, Clare Casteel. Accepted 2021. Potato leafroll virus reduces Buchneraaphidocola titer and alters vector transcriptome responses. Scientific Reports. 11, 23931. https://doi.org/10.1038/s41598-021-02673-6
Younghwan Kwak#, Penglin Sun, Venkata RamaSravani Meduri, Diana M. Percy, Kerry E. Mauck, Allison K. Hansen. 2021. Uncovering symbionts across the psyllid tree of life and the discovery of a new Liberibacter species, ‘Candidatus’ Liberibacter capsica. Frontiers in Microbiology. Sep 29;12:739763. doi: 10.3389/fmicb.2021.739763.
Margaret W. Thairu#, Venkata Rama Sravani Meduri, Patrick H. Degnan, Allison K. Hansen. 2021. Natural selection shapes maintenance of orthologous sRNAs in divergent host-restricted bacterial genomes. Molecular Biology and Evolution. Volume 38, Issue 11, November 2021, Pages 4778–4791, https://doi.org/10.1093/molbev/msab202.
Pers, Daniel### and Allison K. Hansen. 2021. The boom and bust of the aphid's essential amino acid metabolism across nymphal development. Genes Genomes Genetics (G3). Volume 11, Issue 9, September 2021, jkab115, https://doi.org/10.1093/g3journal/jkab115 Alison Ravenscraft, Margaret W. Thairu#, Allison K. Hansen, Martha S. Hunter. 2020. Continent-scale sampling reveals fine-scale turnover in a beneficial bug symbiont. Frontiers in Microbiology. 19 June (11). 1276. https://doi.org/10.3389/fmicb.2020.01276
Allison K. Hansen, Daniel Pers### and Jacob A. Russell. 2020. Symbiotic solutions to nitrogen limitation and amino acid imbalance in insect diets. In Kerry Oliver (Ed), Advances in Insect Physiology-VOL 58-Mechanisms Underlying Microbial Symbiosis (pp. in press LINK). Elsevier.
Thairu#, M.W. and A. K. Hansen. 2019. Changes in aphid host-plant diet influences the small RNA expression profiles of its obligate nutritional symbiont, Buchnera. mBio: 10(6) e01733-19. doi: 10.1128/mBio .01733-19. mbio.asm.org/content/10/6/e01733-19 Pers###, D., and A. K. Hansen. 2019. The effects of different diets and transgenerational stress on Acyrthosiphon pisum development. Insects. 10(9). pii: E260. doi: 10.3390/insects10090260.
Mauck, K., Sun, P., Meduri, V., A. K. Hansen. 2019. New Ca. Liberibacter psyllaurous haplotype resurrected from a 49-year-old specimen of Solanum umbelliferum: a native host of the psyllid vector. Scientific Reports. 9 : 9530. doi.org/10.1038/s41598-019-45975-6 www.nature.com/articles/s41598-019-45975-6
Thairu#, M.W. and A. K. Hansen. 2019. It’s a small, small world: Unraveling the role and evolution of small RNAs in organelle and endosymbiont genomes. FEMS Microbiology Letters. Volume 366, Issue 5, March 2019, fnz049, https://doi.org/10.1093/femsle/fnz049.
Kim#, D., H., B.F. Minhas#, H. Li-Byarlay , A.K. Hansen. 2018. Key transport and ammonia recycling genes involved in aphid symbiosis respond to host-plant specialization. Genes Genomes Genetics (G3). 8(7):2433-2443. [Early online link] <see news article link on this paper: https://ucrtoday.ucr.edu/53674>
Jamison##, B.V., Thairu# , M., A.K. Hansen. 2018. Efficacy of in vivo electroporation on the delivery of molecular agents into aphid (Hemiptera: Aphididae) ovarioles. Journal of Insect Science. 18(2):49. https://doi.org/10.1093/jisesa/iey041.
Seong K.M., Coates B.S., Kim# D., Hansen A.K., B.R. Pittendrigh. 2018. Differentially expressed microRNAs associated with changes of transcript levels in detoxification pathways and DDT-resistance in the Drosophila melanogaster strain 91-R. PLoS ONE. 13(4): e0196518. https://doi.org/10.1371/journal.pone.0196518.
Thairu# M.W., Cheng## S, Hansen A.K. 2017. A sRNA in a reduced mutualistic symbiont genome regulates its own gene expression. Molecular Ecology. 00: 1–11. https://doi.org/10.1111/mec.14424[LINK]
Hansen A.K. and Skidmore##, I.H. 2017. Psyllids, it's what's on the inside that counts: community cross talk facilitates prophage interactions. mSphere. 2:e00227-17. https://doi.org/10.1128/mSphere.00227-17. [LINK]
Skidmore##, I.H. and A.K. Hansen. 2017. The evolutionary development of plant-feeding insects and their nutritional endosymbionts. Insect Science. doi:10.1111/1744-7917.12463. [LINK]
Riley##, A.B., Kim#, D., and A.K. Hansen. 2017. The Genome Sequence of Candidatus Carsonella ruddii strain BC, a Nutritional Endosymbiont of Bactericera cockerelli. Genome Announcements. 5:e00236-17. https://doi.org/10.1128/genomeA.00236-17. [LINK]
Russell, J.A., Oliver, K.M., A.K. Hansen. 2017. Band-aids for Buchnera and B-vitamins for all. Molecular Ecology. 26: 2199–2203. doi:10.1111/mec.14047. [LINK]
Thairu#,M.W., I.H. Skidmore##, R. Bansal, E. Nováková, T.E. Hansen##, H. Li-Byarlay, S.A. Wickline, and A.K. Hansen. 2017. Efficacy of RNAi knockdown using aerosolized siRNAs bound to nanoparticles in three different aphid species. Insect Molecular Biology. 26: 356–368. doi:10.1111/imb.12301. [LINK]
Muturi, E.J., J.J. Bara, A.P. Rooney, and A.K. Hansen. 2016. Midgut fungal and bacterial microbiota of Aedes triseriatus and Aedes japonicus shift in response to La Crosse virus infection. Molecular Ecology. 25(16):4075-90. [LINK]
Kim#*,D., M.W. Thairu#*, and A.K. Hansen. 2016. Novel Insights into Insect-Microbe Interactions- Role of Epigenomics and Small RNAs. Front. Plant Sci.7:1164. doi:10.3389/fpls.2016.01164.[LINK] *Co-first authors - Contributed equally
Hansen, A.K. and P.H. Degnan. 2014. Widespread expression of conserved small RNAs in small symbiont genomes. ISME J. 8, 2490–2502; doi: 10.1038/ismej.2014.121. [LINK]
Casteel, C.L. and Hansen, A.K. 2014. Evaluating insect- microbiomes at the plant-insect interface. Journal of Chemical Ecology.40(7):836-47; doi: 10.1007/s10886-014-0475-5. [LINK]
Hansen, A.K. and N.A. Moran 2014. The impact of microbial symbionts on host plant utilization by herbivorous insects. Molecular Ecology. 23(6):1473-96. [LINK]
Sabree, Z.L., A.K. Hansen, and N.A. Moran 2012. Independent studies using deep sequencing resolve the same set of core bacterial species dominating gut communities of honey bees. PLoS ONE 7(7): e41250. [LINK]
Hansen, A.K. and N.A. Moran 2012. Altered tRNA characteristics and 3' maturation in bacterial symbionts with reduced genomes. Nucleic Acids Research 40(16), 7870-7884. [LINK]
Moran, N.A., A.K. Hansen, J.E. Powell, and Z.L. Sabree 2012. Distinctive gut microbiota of honey bees assessed using deep sampling from individual worker bees. PLoS ONE. 7(4): e36393. [LINK]
Hansen*, A.K., C.L. Casteel*, L.L. Walling, and T.D. Paine 2012. Manipulation of plant defense responses by the tomato psyllid (Bactericera cockerelli) and its associated endosymbiont Liberibacter psyllaurous. PLoS ONE. 7(4): e35191.[LINK] *Co-first authors - Contributed equally
Hansen, A.K., C. Vorburger, and N.A. Moran 2012. Genomic basis of endosymbiont-conferred protection against an insect parasitoid. Genome Research. 22:106-114. [LINK]
Hansen, A.K. and N.A. Moran 2011. Aphid genome expression reveals host-symbiont cooperation in the production of amino acids. Proceedings of the National Academy of Sciences USA. January 31, 2011. [LINK]
Six, D.L., M. Poulsen, A.K. Hansen, M.J. Wingfield, J. Roux, P. Eggleton, B. Slippers, and T.D. Paine 2011. Anthropogenic effects on interaction outcomes: examples from insect-microbial symbioses in forest and savanna ecosystems. Symbiosis. 53:101-121. [LINK]
Degnan, P.H., L.S. Bittleston, A.K. Hansen, Z.L. Sabree, N.A. Moran, and R.P. Almeida 2011. Origin and examination of a leafhopper facultative endosymbiont. Current Microbiology. 62(5): 1565-1572. [LINK]
Hansen, A.K., D.L. Six, and Y.K. Ortega 2009. Comparison of ground beetle (Coleoptera: Carabidae) assemblages in Rocky Mountain savannas invaded and un-invaded by an exotic forb, spotted knapweed. Northwest Science. Volume 83 Issue 4: 348–360. [LINK]
Hansen, A.K., J.T. Trumble, R. Stouthamer, and T.D. Paine 2008. New Huanglongbing (HLB) Candidatus species,"C. Liberibacter psyllaurous", found to infect tomato and potato is vectored by the psyllid Bactericerca cockerelli (Sulc). Applied and Environmental Microbiology. Vol. 74, No. 18: 5862-5865. [LINK]
Mc Donnell, R.J., A. Hansen, T.D. Paine, and M.J. Gormally 2008. A record of the invasive slug, Veronicella cubensis (Pfeiffer, 1840) in California. The Veliger. Vol. 50, No. 2: 81-82.
Hansen, A.K., G. Jeong, T.D. Paine, and R. Stouthamer 2007. Frequency of secondary symbiont infection in an invasive psyllid relates to parasitism pressure on a geographic scale in California. Applied and Environmental Microbiology. Vol. 73, No. 23: 7531-7535. [LINK]
Reed, D.A., K.A. Luhring, C.A. Stafford, A.K. Hansen, J.G. Millar, L.M. Hanks, and T.D. Paine 2007. Host defensive response against an egg parasitoid involves cellular encapsulation and melanization. Biological Control 41(2), 214-222. [LINK]