Toshio Tsukiyama, PhD, DVM

faculty member

Toshio Tsukiyama, PhD, DVM

Professor and Associate Director
Basic Sciences Division, Fred Hutch

Fax: 206.667.6497
Mail Stop: A1-162

Dr. Toshio “Toshi” Tsukiyama studies how cells regulate chromatin, the packaging proteins responsible for compressing several feet of DNA inside each cell’s tiny nucleus. This genetic material needs to be carefully unpacked and repacked when cells need to divide or turn on genes at just the right time — two processes that can go wrong in cancer cells. Dr. Tsukiyama has discovered that a specific family of proteins helps the most basic units of chromatin — cartwheel-shaped molecular complexes around which DNA spools — slide along DNA to help control when genes are turned on and off. He also studies how the 3D structure of DNA, the large loops and folds it undergoes, can be harnessed to regulate cellular processes. Widespread gene shutdown and DNA compaction are hallmarks of an important, energy-conserving cellular state known as quiescence. Though quiescence is a normal state for cells in many of our tissues, it can also be used by cancer cells to resist chemotherapy. A deeper understanding of this state could lead to better treatments for cancer and other diseases. Dr. Tsukiyama studies how cells create the 3D DNA structure that helps them enter quiescence and keep genes turned off.

Other Appointments & Affiliations

Affiliate Associate Professor, Biochemistry
University of Washington School of Medicine


Ph.D., Mechanism of Suppression of the Long Terminal Repeat of Moloney Leukemia Virus in Mouse Embryonal Carcinoma Cells, Hiroshima University, 1991

D.V.M., Transforming Genes of Canine Adenovirus Type, Obihiro University of Agriculture & Veterinary Medicine, 1987

B.S., Obihiro University of Agriculture & Veterinary Medicine, 1985

"I’ve never had a moment that I wanted to do anything else."

— Dr. Toshio Tsukiyama

Find A Clinical Trial

Dr. Tsukiyama in the News

Chromatin fibers: oh what a tangled web we weave

Science Spotlight - January 17, 2022

Science on the horizon

Hutch News - December 27, 2019

Condensing DNA in dormancy

Science Spotlight - February 18, 2019

For cells, keeping quiet is a cinch

Hutch News - January 03, 2019

Chromatin remodeling at the yeast ribosomal DNA locus

Science Spotlight - December 17, 2018

For the Media

The Media Relations team at Fred Hutch is available to assist members of the news media who would like to arrange interviews with faculty.

Email or call 206.667.2210