Telomeropathies, or telomere biology disorders, are a group of rare inherited conditions in which telomeres shorten too quickly because of a fault in the system that maintains them — most often the enzyme telomerase.
Tissues with active division are depleted ahead of time: the bone marrow, skin, lungs, liver. In essence this is a model of accelerated, premature aging at the cellular level.
How they present
The classic example is dyskeratosis congenita with a triad of signs: abnormal skin pigmentation, nail dystrophy and white plaques on the oral mucosa (leukoplakia). The most dangerous complication is progressive bone-marrow failure (aplastic anemia), which develops in more than 80% of patients. Also seen are pulmonary (idiopathic) fibrosis, liver involvement and an increased risk of certain tumours. A severe early form is Hoyeraal–Hreidarsson syndrome.
Genes and inheritance
The faults affect telomere-maintenance genes: DKC1 (X-linked, the protein dyskerin), TERT and TERC (components of telomerase), TINF2 (part of shelterin), as well as NOP10 and NHP2. Inheritance can be X-linked, autosomal dominant or recessive. A characteristic feature is genetic anticipation: in each successive generation of the family the disease may begin earlier and run more severely, because shortened telomeres are passed on to offspring.
Link to aging
Telomeropathies show what happens when the "division counter" is broken from birth: tissues wear out decades earlier. This is not the same as ordinary aging, but a striking illustration of the role of telomeres. For example, some cases of pulmonary fibrosis in adults are linked precisely to TERT mutations. Mechanistically, telomere shortening leads to cellular senescence and stem-cell depletion.
Calculate using this marker
Calculators where Telomeropathies is used directly:
Frequently asked questions
Are telomeropathies accelerated aging?
Partly yes: because telomere maintenance is broken, dividing tissues are depleted ahead of time. But these are distinct inherited diseases, not simply "fast" ordinary aging.
Are they inherited?
Yes. Inheritance can be X-linked, dominant or recessive. Anticipation is characteristic — in later generations the disease often starts earlier and runs more severely.