Lab mice are probably not the happiest of creatures. Food is not much of a problem (unless they are in one of those starvation-diet experiments) but roaming is discouraged, the environment is not that cozy and I imagine they don’t get given the wifi password. Even so, most of them don’t have to put up with researchers deliberately making them depressed.
All in a good cause, naturally, from the human point of view. Researchers, mostly at UCSF, identified a variant form of the PER3 gene in humans, which is involved with the circadian clock. The variant also seems to be linked to a tendency to sleep and wake very early (Familial Advanced Sleep Phase, or FASP) — and also with seasonal affective disorder (SAD). SAD is a relatively common kind of depression related somehow to changes in the length of the day, especially in the fall.
There is a long, long way to go before anyone can even think about using this linkage in therapeutic approaches, but it could be an important clue as to how sleep and mood disorders may be linked.
Bring on the mice. The scientists made transgenic mice with the human gene variant. And controlled the lighting to match the changing seasons. Bingo:
The model mice slept and behaved normally when their days and nights were of equal length, but developed depression-like symptoms as nights became longer than days.
You can’t do talk therapy with mice, but basically when they are feeling under the weather they don’t wriggle as much and they give up quick when something disturbing happens, like someone with a white coat picking them up.
The views, opinions and positions expressed by these authors and blogs are theirs and do not necessarily represent that of the Bioethics Research Library and Kennedy Institute of Ethics or Georgetown University.