Exact, Time-Independent Estimation of Clone Size Distributions in Normal and Mutated Cells

The study presented an alternative method for estimating clone size distributions in normal and mutated cells without relying on clonal age, which offered analytical advantages. By modeling clone size independent of time, the researchers provided a framework applicable to general birth-death processes, such as those in epithelial progenitors, and related it to a gambler's ruin problem. This approach allowed for exact formulations of classic Luria-Delbrück-type problems and could be extended beyond neutral models of mutant clonal evolution. The applications included resolving the probability of progenitor cells generating proliferating or differentiating progeny in lineage tracing experiments and modeling mutation frequency distributions from deep sequencing of subclonal samples.