Wound Epithelium Cellular dedifferentiation Naturally turn back cellular clock Proliferation The Basis of Regeneration Wound healing
Proposal Investigate genetic pathways and specific regulators of the dedifferentiation pathway in the salamander model Manipulation of specific regulators in orthologous human pathways dedifferentiation in human cells?
The Importance Fundamental understanding of pathways give insight into control of dedifferentiated cells Regenerative pathways – scar tissue vs. redevelopment- one piece to the puzzle
The Impact Treatment for many diseases Help in tissue regeneration research Development of disease specific materials Insight into natural regenerative processes human regeneration
Competing Technologies Induced pluripotent stem cells (Yu et al. 2007) ◦ Epigenetic reprogramming ◦ Clinical research of pluripotent stem cells
KnownsUnknowns Induce pluripotency in human somatic cells Nerve-dependent regeneration/ neurotrophic factor signaling (Kumar et al. 2007) Salamander genome Control of induced pluripotent stem cells - cancerous Degree of pluripotency Self assembly of cell lines into tissues
Chitinase-erase Food Allergies: When your immune system reacts against a harmless compound found in what you eat.
Chitinase? What and Why? Plant defense: Chintin-ases breakdown fungi and some bacterial cell walls Expressed in low amounts—0.01% in grains is “substantial” Increase in production-exposure to chitin, chitosan, ethylene Increase Latex-Fruit syndrome due to our current ripening process with ethylene gas
Importance: Latex-Fruit Syndrome Chitinase causes “Cross-reactive allergen” with Latex -hevein-like domain at the N termius 1-6% of the population suffers from Latex allergy Latex-Fruit Allergy: 30-50%
Importance: Treatment of Severe Allergies Due to B cell/antibody sensitivity to specific antigens in a particular food. Recognition of Epitope Histamine release Anaphylatic shock Possible Death EpiPens: a large dosage of Epinephrine
Competing Technology: Medicinally IgE Neutralization: Omalizumab -monoclonal antibody -mainly for allergenic asthmatics Immunotherapy: -exposing bits of allergenic substances to the body, increasing the concentrations over time -either shots or small bits of food
Proposal Temporary Knockout of Chitinase before harvesting Control of Knockout through an environmentally sensitive promotor Indicator that confirms Chintinase knockout Feedback mechanism even after harvest
Knowns: Current Plant Technologies Insertion of Recombinant DNA-plants -Ti Plasmid -Gene gun Temporary knockout of proteins: -RNAi -Transcription Repressors Plants have stem cells—can develop into an entire organism from a few cells
Unknowns Chitinase protein production pathway Control of Promotor Developing an entire plant Progeny that does not need infection Would it be safe to eat? Taste the same? Accepted by Public?
Impact Allergy-free or hypoallergenic foods: more food options Same technology- eliminate or enhance certain chemicals in plants and even other organisms
Want Milk? The purpose of this project is to allow lactose intolerant individuals to consume dairy products without having to ingest lactase with every ingestion of dairy. (1)
Want Milk? Lactose intolerance affects 70-75% of people worldwide, with its prevalence varying by ethnicity. (2)
Want Milk? General Plan of Action - Create a gene that codes for lactase and insert it into Bifidobacterium Bifidum -The bacteria will then begin producing lactase -Find a way to insert new bacteria into GI tract, such as direct ingestion. Potential medium: yogurt -Possibility of bacterial conjugation
Want Milk? This project would have a great impact worldwide if it was successful. Only 10% of Americans suffer from lactose intolerance, but success would improve the lives of over 70% of the world’s population
Want Milk? Competition Lactaid and other brands make lactase that can be ingested with a meal, as well as lactose-free dairy products. (3)
Want Milk? Knowns: -Lack of ability to produce lactase causes lactose intolerance -B. Bifidum is beneficial to our health and digestion, is found in almost everyone, stays in the lower GI tract, is immobile, and safe to use -Lactase can be/has been produced through biological methods
Want Milk? Unknowns: -Whether the B. Bifidum would stay in the GI tract once it is introduced -What signals to use to trigger and halt enzyme production -Whether it is possible for the bacteria to produce sufficient amounts of lactase
Sources A Leap Towards Regeneration? Resources Picture: tree frog (Intro slide)http://artfiles.art.com/5/p/LRG/8/892/IENJ000Z/tree-frog.jpg Pictures: newswiseblog.blogspot.com/2009_05_01_archive.html Background of Earthnewswiseblog.blogspot.com/2009_05_01_archive.html Picture of axolotl Picture of zebrafish Picture of planarian flatworms Picture of axolotl Picture of cartoon salamander Picture of induced pluripotent stem cells Articles: Nishikawa, S., R.A. Goldstein, and C.R. Nierras. "The Promise of Human Induced Pluripotent Stem Cells for Research and Therapy." Nature Reviews Molecular Cell Biology. 9.Sept. (2008): Yu, J. et al. "Induced Pluripotent Stem Cell Lines Derived from Human Somatic Cells." Science. 318.Dec. (2007): Kragl, M. et al. "Cells Keep a Memory of Their Tissue Origin During Axolotl Limb Regeneration." Nature. 460.July (2009): Kumar, A. et al. "Molecular Basis for the Nerve Dependence of Limb Regeneration in an Adult Vertebrate." Science. 318.Nov (2007):
Sources continued… Chitinase-erase Picture of Payaya (intro slide) : Picture of Xolair (Omalizumab): Picture of Latex glove: Picture of avocado: Picture of N terminus hevein domain: Picture of plant callus: Picture of GUS reporter: Rice_embryo.pnghttp://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Rice_embryo.png/220px- Rice_embryo.png ssive+and+defensive+roles+for+chitinases%22&ots=yitZdTSGMH&sig=6C0KXm93mM3NLu2a0- R9JWIUx_0#v=onepage&q=&f=false ssive+and+defensive+roles+for+chitinases%22&ots=yitZdTSGMH&sig=6C0KXm93mM3NLu2a0- R9JWIUx_0#v=onepage&q=&f=false Articles: Paul P. Belliveau. "Omalizumab: A Monoclonal Anti-IgE Antibody." MedGenMed. 2005; 7(1): 27. Elizabeth Landau. “'Exciting' advance reported in peanut allergy therapy.” CNN. February 19, R. A. Jefferson. The GUS Reporter Gene System. Nature 342, (14 December 1989). Wagner, S. and Breiteneder, H.: “The latex-fruit syndrome.” Biochem. Soc. Trans., 6, (2002) latex-fruit syndrome. Website on Latex-Fruit Syndrome: