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David Claassen, MD, PhD

Clinical Assistant Professor of Pediatrics - Hematology Oncology

Contact Information

1326 Boyd Tower (BT)
200 Hawkins Drive
Iowa City, IA 52242


BA, Biology, Carleton College
PhD, Cancer Research Graduate Program, University of Nebraska Medical Center
MD, Medicine, University of Nebraska College of Medicine
Resident, Pediatrics, University of Texas Southwestern/Children's Medical Center
Fellow, Pediatric Hematology/Oncology, St. Jude Children's Research Hospital

Licensure and Certifications

Board Certification, Pediatrics - American Board of Pediatrics


Claassen, D. A., Desler, M. M. & Rizzino, A. (2009). ROCK inhibition enhances the recovery and growth of cryopreserved human embryonic stem cells and human induced pluripotent stem cells. Molecular reproduction and development, 76(8), 722-32. PMID: 19235204.

Boer, B., Cox, J. L., Claassen, D., Mallanna, S. K., Desler, M. & Rizzino, A. (2009). Regulation of the Nanog gene by both positive and negative cis-regulatory elements in embryonal carcinoma cells and embryonic stem cells. Molecular reproduction and development, 76(2), 173-82. PMID: 18537119.

Claassen, D. A., Lahue, R. S. (2007). Expansions of CAG.CTG repeats in immortalized human astrocytes. Human molecular genetics, 16(24), 3088-96. PMID: 17881653.

Griffin, A. E., Cobb, B. R., Anderson, P. D., Claassen, D. A., Helip-Wooley, A., Huizing, M. & Gahl, W. A. (2005). Detection of hemizygosity in Hermansky-Pudlak syndrome by quantitative real-time PCR. Clinical genetics, 68(1), 23-30. PMID: 15952982.

Huizing, M., Hess, R., Dorward, H., Claassen, D. A., Helip-Wooley, A., Kleta, R., Kaiser-Kupfer, M. I., White, J. G. & Gahl, W. A. (2004). Cellular, molecular and clinical characterization of patients with Hermansky-Pudlak syndrome type 5. Traffic (Copenhagen, Denmark), 5(9), 711-22. PMID: 15296495.

Griffin, A., Anderson, P., Claassen, D. A., Gahl, W. A. & Huizing, M. (2004). Hemizygosity at 10q23 in a family with Hermansky-Pudlak syndrome type 1. (Vols. 81). (3), pp. 171. Molecular genetics and metabolism.

Helip-Wooley, A., Huizing, M., Dorward, H., Claassen, D. A., Hess, R. & Gahl, W. A. (2004). Abnormal vesicle formation and trafficking in Hermansky-Pudlak syndrome cells. (Vols. 81). (3), pp. 172. Molecular genetics and metabolism.

Hess, R. A., Claassen, D. A., White, J., Gahl, W. A. & Huizing, M. (2003). Huizing M. Hermansky-Pudlak syndrome type 5 and type 6: Four new patients. (Vols. 73). (Supplement), pp. 1676. American journal of human genetics.

Huizing, M., Helip-Wooley, A., Dorward, H., Claassen, D. A., Hess, R. & Gahl, W. A. (2003). Hermansky-Pudlak syndrome: a model for abnormal vesicle formation and trafficking. (Vols. 16). (5), pp. 584. Pigment cell research.

Anderson, P. D., Huizing, M., Claassen, D. A., White, J. & Gahl, W. A. (2003). Hermansky-Pudlak syndrome type 4 (HPS-4): clinical and molecular characteristics. Human genetics, 113(1), 10-17. PMID: 12664304.