How do cells keep time? For decades, biological timekeeping has been understood through the lens of master clocks: the CDK–Cyclin oscillator that drives the cell division cycle and the circadian clock that aligns physiology with the day–night cycle. Yet recent discoveries are reshaping this view. Cellular time control is now emerging as a phenomenon governed not solely by such master clocks, but by coupled networks of otherwise independent timing mechanisms dedicated to specific cellular events.

This book introduces and defines the emerging concept of autonomous clocks: cellular timing systems that can be entrained by canonical cell-cycle or circadian programs, yet retain the ability to operate independently to time and execute specific biological events. These autonomous clocks are increasingly recognized across organelle biogenesis, transcription, cytoskeletal remodeling, redox metabolism, proteostasis, immunity, nuclear organization, and even cytoplasmic division independent of nuclei and classical cell-cycle control. Together, they reveal a rich temporal architecture of the cell—one in which subcellular processes are not merely passive outputs of master clocks but are governed by dedicated oscillators that act as autonomous timing systems.

Bringing together leading voices in cell biology, physiology, synthetic biology, biophysics, and mathematical biology, this volume offers the first comprehensive account of autonomous clocks as a unifying framework for biological time control. The chapters span foundational discoveries in autonomous transcriptional, cytoskeletal, redox, proteostasis, immune, and otherwise sub-cellular timing systems, while also exploring how these autonomous cycles couple to broader cellular rhythms, how they may be engineered synthetically, and how their principles can be understood through theory and computation. By synthesizing a decade of rapidly expanding discoveries, this book challenges long-standing textbook models of cellular timekeeping and opens new conceptual ground for understanding how cells coordinate physiology, maintain temporal order, and preserve function when canonical clocks are slowed, suspended, or silenced.

Biological Time Control: Autonomous Clocks in Cellular Organization, Dynamics, and Function is an essential resource for students, researchers, and scholars interested in biological time control from the perspective of cell biology, systems biology, synthetic biology, physiology, and the molecular logic of cellular organization. It will be especially valuable to readers seeking a forward-looking framework for how timing mechanisms shape life at the subcellular, cellular, and organismal scales.

Dr. Mustafa Aydogan is an Assistant Professor of Genetics and Development at Columbia University and an Early Career Scholar of the Howard Hughes Medical Institute. He received his B.A. in Molecular, Cellular, and Developmental Biology from the University of Colorado Boulder, where he worked under the mentorship of J. Richard McIntosh and Natalie G. Ahn. During his doctoral studies with Jordan Raff at the University of Oxford, Dr. Aydogan discovered the molecular clock that drives centriole biogenesis cycles: one that is normally entrained by the canonical cell-cycle oscillator, CDK-cyclin complexes, to remain synchronized with the cycles of DNA replication and segregation, yet it can also operate independently to govern centriole biogenesis when CDK activity is silenced. Together with other studies revealing a broad range of cell biological processes regulated by autonomous cycles, Dr. Aydogan’s foundational contributions and leadership have helped define the emerging concept of autonomous clocks. His pioneering work enabled him to launch his independent laboratory immediately after his Ph.D. as a Faculty Fellow at the University of California, San Francisco. Dr. Aydogan’s recent work continues to shape this field, including his laboratory’s discovery that cytokinesis, the division of the cytoplasm, can proceed in periodic cycles independently of the nucleus and mitotic CDK-cyclin complexes. His early accomplishments have been recognized by numerous honors, including the Sandler Foundation Faculty Award in 2020, the NIH Director’s New Innovator Award in 2023, and the HHMI Freeman Hrabowski Scholar Award in 2025.