mice were reversed when Klotho expression
was re-induced [53]. A variant of Klotho, known as KL-VS, has also
been associated with human ageing. Individuals that are homozygous for the KL-VS alleles have a reduced life span [54]. However,
those individuals with the heterozygous genotype have enhanced
longevity [54,55]. This human KL-VS variant also has an effect on
coronaryarterydisease [56], hypertension [57]and osteoporosis[58].
Further support for a link to human ageing is the observation that the
plasma level of Klotho decreases with age after 40 years [59].