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To investigate whether extreme light conditions alter the expression of RNA m6A methylation regulators in brain regions during anxiety- and depression-like behaviors in mice.
A total of 48 male C57BL/6J mice were randomly divided into control, constant light, and constant dark groups (n=8 per group) for 2- or 4-week interventions.Behavioral tests assessed anxiety- and depression-like behaviors. After completion of these assessments, the medial prefrontal cortex, hypothalamus, amygdala, and ventral hippocampus were collected for qRT-PCR analysis of m6A methyltransferases and reader proteins. Differences between groups were determined using one-way ANOVA with multiple comparisons.
Compared with the control group, after 2 weeks, constant dark exposure induced significant anxiety- and depression-like behaviors (P<0.01), while constant light showed no effect. After 4 weeks, both extreme light conditions caused behavioral abnormalities (P<0.01). Compared with the control group, qRT-PCR revealed that 2-week constant dark exposure significantly altered m6A regulators: increased Mettl3 in medial prefrontal cortex (P<0.05); decreased Mettl3 and YthdF1 in hypothalamus (P<0.05); increased FTO and ALKBH5 but decreased YthdC1 in ventral hippocampus (P<0.05); and increased ALKBH5/YthdC2 but decreased YthdC1 in amygdala (P<0.05).
Constant dark exposure more readily induces anxiety- and depression-like behaviors than constant light, and extreme light conditions modify the expression profile of RNA m6A methylation regulators in emotion-related brain regions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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