• Welcome to the Clark Lab at UCLA

    Laboratory for Reproductive Science and Stem Cell Biology

Using Stem Cell Science to Improve Reproductive and Women’s Health 

Through over two decades of rigorous, transparent science, our team is committed to inventing stem cell-based mechanistic solutions to improve human health. Our approach involves the use of biological samples, the generation of big data, machine learning, and genome engineering in stem cells to fill knowledge gaps and provide a mechanistic framework for understanding the reproductive system across the life course. The goal of our work is to apply this knowledge to stem cell models of human development, ovarian disease and ovarian aging with the goal of moving beyond prediction to mechanistic understanding.

If you are interested in learning more or would like to join our research team please send us an e.mail. To learn more about reproductive health and science research on the UCLA campus, please visit the UCLA Center for Reproductive Science Health and Education.

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Select Publications

  • Wamaitha, SE., Rojas, EJ., Monticolo, F., Hsu, FM., Sosa, E., Mackie, AM., Oyama, K., Custer, M., Murphy, M., Laird, DJ., Shu, J., Hennebold, JD., Clark, AT. (2025) Defining the cell and molecular origins of the primate ovarian reserve. Nature Communications 16:7539; 1-17 (link)

  • Sosa, E., Wamaitha, SE., Hsu, F-M., Lara, MJD., Oyama, K., Custer, M., Murphy, M., Hennebold, JD., Hwang, YS Clark, AT (2025) Testicular somatic and germ cell maturation during rhesus macaque development. Proceedings of the National Academy of Science 122, 1-11 (link)

  • Wamaitha, SE., Nie, X., Pandolfi, EC., Want, X., Yang Y., Stukenborg, JB., Cairns, BR., Guo, JT., Clark, AT (2023). Single-cell analysis of the developing human ovary defines distinct insights into ovarian somatic and germline progenitors. Developmental Cell. 58; 1-15 (link)

  • Xiang, X., Tao, Y., DiRusso, J., Hsu, FM., Zhang, J., Xue, Z., Pontis, J., Trono, D., Liu, W., Clark AT (2022). Human reproduction is regulated by retrotransposons derived from ancient Hominidae-specific viral infections. Nature Communications 13(1):463. doi: 10.1038/s41467-022-28105-1 (link)

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Our lab is funded by the following sources:

National Institutes of Health - Turning discovery into health
UCLA Broad Stem Cell Research Center
CIRM - California Stem Cell Agency
The Lalor Foundation - Advancing Research and Innovation in Reproductive Health