Restricted Research - Award List, Note/Discussion Page
Fiscal Year: 2023
302 The University of Texas Rio Grande Valley (142190)
Principal Investigator: VandeBerg,John L
Total Amount of Contract, Award, or Gift (Annual before 2011): $ 366,300
Exceeds $250,000 (Is it flagged?): Yes
Start and End Dates: 2/1/23 - 1/31/25
Restricted Research: YES
Academic Discipline: Human Genetics
Department, Center, School, or Institute: Human Genetics
Title of Contract, Award, or Gift: Creation of Knockout Laboratory Opossums
Name of Granting or Contracting Agency/Entity:
U.S. Dept of Health & Human Services
CFDA: 93.351
Program Title: Research Infrastructure Programs
Note:
SAMs 1.1.1--In this research project, the PI’s laboratory will pave the way for achieving the long-term objective, which is to establish a national research resource that will efficiently and economically create geneedited opossums required by US investigators to address important biomedical questions that this laboratory animal is uniquely suited to address. While the volume of research with this species at any single institution cannot justify the cost of establishing a large colony and gene editing technologies, a centralized resource will be capable of serving all of the national needs at minimal cost. The specific aims are 1) to establish expertise and proof-of-principle in our laboratory by targeted disruption of Tyr in a fully inbred strain of laboratory opossums, and 2) to conduct targeted disruption of the phosphatase and tensin homolog gene (Pten) in opossums of the same inbred strain. Knockout opossums will be created by applying CRISPR-Cas9 technology to opossum embryos collected 30 - 34 hours after copulation, after which the egg shell becomes too hard to penetrate. Penetration will be enhanced via the use of a piezoelectric actuator. The laboratory opossum is the only marsupial that is available in large numbers for biomedical research. It is a unique or specialized model for research on many human diseases and developmental processes, as well as for comparative biology and comparative genomics purposes. The PI maintains by far the largest breeding and research colony of this species in the world. The most critical barrier to fulfilling the research potential of the laboratory opossum is the lack of success of anyone in the US in establishing gene-editing procedures for this species. A Japanese group recently overcame the technological impediments to gene editing of this species, and succeeded in knocking out the tyrosinase (Tyr) gene in random-bred opossums. The implementation and optimization of their methods at the Confirmation of knockout genotype will be established by genomic DNA analysis of progeny weaned from the treated embryos, and from subsequent generations of animals produced from those progeny. Pten -/- homozygotes are expected to embryonic lethal, but heterozygotes are expected to serve as new model in comparative medicine research on Autism Spectrum Disorder. We plan to establish a research project on that topic beyond the 2-year project period, after a sufficient number of +/- animals have been produced.
Discussion: No discussion notes