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Tracing the First Asymmetry: How Fertilization Orchestrates Cell Fate Biases in the Early Mammalian Embryo

Award Number: F31HD122376
ORGANIZATION: NATIONAL INSTITUTE OF CHILD HEALTH AND HUMAN DEVELOPMENT
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: FELLOWSHIP/SCHOLARSHIP/STUDENT LOANS
PERIOD OF PERFORMANCE START DATE: 07/01/2026
PERIOD OF PERFORMANCE END DATE: 06/30/2029

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Tracing the First Asymmetry: How Fertilization Orchestrates Cell Fate Biases in the Early Mammalian Embryo - Abstract In sexually reproducing organisms, the fusion of an oocyte and a sperm forms a totipotent zygote capable of generating every cell type in the body. In several model organisms such as Drosophila melanogaster, early asymmetries in the oocyte established before fertilization determine future developmental trajectories. However, the mechanisms that break symmetry and guide early cell fate biases in mammals remain poorly understood. Classical views held that mammalian embryos remain developmentally equivalent until the 16-cell stage, when inside and outside cells begin to emerge. Yet, recent studies suggest that asymmetries can arise as early as the 2-cell stage. At this early stage, both blastomeres are capable of generating all embryonic and extraembryonic lineages, but they often display reproducible biases in lineage contributions. One blastomere tends to favor epiblast fate, which gives rise to the embryo proper, while the other more often contributes to extraembryonic lineages like the trophectoderm. This phenomenon has also been observed in human embryos, implying conserved mechanisms underlying early cell fate biases. When these cells are physically separated at the 2-cell stage and cultured independently, only one consistently forms a robust inner cell mass, suggesting inherent differences in developmental potential. We have observed that in 2-cell stage mouse embryos, the cell with higher epiblast contribution correlates with the cell that inherits the sperm entry point. This research aims to identify the molecular and structural cues introduced at fertilization—such as sperm-derived components and the second polar body—that influence early fate biases in the mammalian embryo. Understanding these early symmetry-breaking events has broad implications for reproductive biology, stem cell research, and our fundamental understanding of developmental potential.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2026 ( Subtotal = $50,114 )
2026	2026	CALIFORNIA INSTITUTE OF TECHNOLOGY	1200 E CALIFORNIA BLVD	PASADENA	CA	91125	LOS ANGELES	USA	Child Health and Human Development Extramural Research	001	1	6/10/2026	NEW	$0
2026	2026	CALIFORNIA INSTITUTE OF TECHNOLOGY	1200 E CALIFORNIA BLVD	PASADENA	CA	91125	LOS ANGELES	USA	Child Health and Human Development Extramural Research	000	1	6/10/2026	NEW	$50,114
														Subtotal = $50,114

Grand Total All Awards = $50,114

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Tracing the First Asymmetry: How Fertilization Orchestrates Cell Fate Biases in the Early Mammalian Embryo

Award Number: F31HD122376

ORGANIZATION: NATIONAL INSTITUTE OF CHILD HEALTH AND HUMAN DEVELOPMENT

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: FELLOWSHIP/SCHOLARSHIP/STUDENT LOANS

PERIOD OF PERFORMANCE START DATE: 07/01/2026

PERIOD OF PERFORMANCE END DATE: 06/30/2029

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