Life Sciences & Medicine Active Updated Oct 4, 2026
Transplanted hearts take on their new host's age
Where it stands as of Oct 4, 2026
Nature reported that months after transplant, DNA methylation in heart tissue moved toward the recipient's biological age instead of the donor's. A Harvard Medical School mouse preprint now shows the same pattern in both directions: older hearts in younger mice read as younger, and younger hearts in older mice aged faster. The authors suggest donor age limits could one day loosen, but the mouse work is not peer reviewed, and whether the shift improves outcomes for patients has not been established.
The story so far
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Oct 4, 2026 Latest
A Harvard Medical School team led by Jesse Poganik reported in a bioRxiv preprint, not yet peer reviewed, that after four to six months, older hearts transplanted into younger mice read as biologically younger and younger hearts in older mice showed signs of faster aging. A quote in a weekly roundup said the group saw the same effect in human transplant recipients, with some but not all functional measures tracking the prediction.
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Sep 30, 2026
Nature's daily briefing reported that months after transplant, DNA methylation in heart tissue shifted toward the recipient's biological age instead of the donor's, which suggests replacement organs could come from older donors than they do now.
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