Off-campus UMass Amherst users: To download campus access dissertations, please use the following link to log into our proxy server with your UMass Amherst user name and password.
Non-UMass Amherst users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
Dissertations that have an embargo placed on them will not be available to anyone until the embargo expires.
Author ORCID Identifier
Campus-Only Access for Five (5) Years
Doctor of Philosophy (PhD)
Animal Biotechnology & Biomedical Sciences
Year Degree Awarded
Month Degree Awarded
Mammalian embryogenesis is a dynamic process involving rapid cell proliferation and multiple cellular differentiation events. The early stage of development consists of many milestones that the embryo must achieve prior to progressing through gestation. These critical developmental benchmarks are governed by multiple genes including those for survival. The International Mouse Phenotyping Consortium (IMPC) has generated over 6,000 gene knockout mouse lines to date and 24% of the mouse strains are identified as embryonic lethal. Our goal is to characterize homozygous knockout mouse embryos that lack both alleles of these lethal genes, identify the stage of lethality, and investigate their role in early embryonic development. Our lab has characterized over 100 embryonic lethal strains and performed detailed analysis on 10 different knockout mouse lines. Presented here are 6 knockout mouse lines – Dynein Axonemal Assembly Factor 2 (Dnaaf2) and 5 members of the Mitochondrial Ribosomal Protein (Mrp) genes in which morphology of the homozygous knockout mouse embryos and their littermates are drastically different. More importantly, none of these embryos are viable beyond embryonic day (E) 9.5 signifying the importance of these genes during early developmental stages. The largescale analysis of over 100 of the homozygous knockout mouse lines reveals developmental bottlenecks that are present in early embryogenesis. Our analysis provides insight into the function of these essential genes during early embryogenesis as well as the process of development as a whole.
Cheong, Agnes, "Analysis of Lethal Phenotypes in the Mouse" (2020). Doctoral Dissertations. 1926.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.