Although some mutants had milder splitting phenotypes, most had multiple rhythms with distinct periods or had no measurable rhythms at all.
A total of 50% of Six3-Cre Lhx1lox/lox mice lacked measurable rhythms within 3 days of entry into DD, while the remainder showed two or even three distinct split rhythms, sometimes of dramatically different periods.
However, in control experiments (data not shown) where flies lived under LL-conditions during all stages of their development, measurable circadian rhythms in the lamina were abolished.
It is not known, however, when cells first express a CRC in-vivo and when they become sufficiently synchronized to produce a measurable tissue-level rhythm.
Our study confirms that rhythms of skin surface parameters are readily measurable and that these rhythms differ between different sites.
Altered day-night cycle: Since the expedition will be undertaken over a full year, the team will experience three to four months of complete darkness enabling research in relation to measurable changes in circadian rhythm.
When a behavioral rhythm is measurable, Six3-Cre Lhx1lox/lox free-running rhythms often lacked a clearly dominant rhythm and were not of significantly different average period than controls, although individual variability in period length was markedly greater.
We therefore asked if knockdown of PDF in the l-vLNs would have measurable effects on locomotor rhythms under DD and LD conditions.
In addition, in our earlier work, we knocked down KPNA1, KPNA3, KPNA4, KPNA5, KPNA6, and KPNA7 (Zhang et al., Cell, 2009), with no measurable effects on circadian rhythms in Bmal1::luc activity in U2 OS cells.
