On a causal mechanism of chronic thymic involution in man

M Hartwig, G Steinmann - Mechanisms of ageing and development, 1994 - Elsevier
The age-associated chronic thymus involution is interpreted to occur due to cytolytic
depletion of thymic stromal tissue whose cells present altered self-peptides. Using simplified
assumptions and based on morphometric data on thymic involution in man, the chance for a
single protein to be altered is estimated to be in the range of 2–4× 10− 6 per year. The
corresponding mutation rate is compatible with that derived from both evolutionary and
direct studies, thus supporting the proposed model.