首页> 美国卫生研究院文献>Frontiers in Zoology >Can colour vision re-evolve? Variation in the X-linked opsin locus of cathemeral Azara’s owl monkeys (Aotus azarae azarae)
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Can colour vision re-evolve? Variation in the X-linked opsin locus of cathemeral Azara’s owl monkeys (Aotus azarae azarae)

机译:色觉可以重新进化吗?大教堂的Azara猫头鹰猴(Aotus azarae azarae)的X连锁视蛋白基因座的变化

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摘要

BackgroundDo evolutionary specializations lead to evolutionary constraint? This appears plausible, particularly when specialization leads to loss of complex adaptations. In the owl monkey lineage, nocturnality clearly arose from a diurnal ancestor. This behavioural shift was accompanied by morphological changes in the eye and orbit and complete loss of colour vision via missense mutations in the gene encoding the short-wave sensitive visual pigment (SWS opsin). Interestingly, at least one subspecies of owl monkey, Azara’s owl monkey (Aotus azarae azarae), has regained activity in daylight. Given that all primate species that are active in daylight, including primarily diurnal species and species that are active during both day and night, have at least dichromatic colour vision, it seems reasonable to propose that dichromacy would be adaptive in A. a. azarae. With a disabled SWS opsin, the main avenue available for Azara’s owl monkeys to re-evolve colour vision is via a polymorphism in the intact X-linked opsin locus, which commonly occurs in other New World monkeys. To examine this possibility we assayed variation in the X-linked opsin of A. a. azarae, focusing on the three exons (3, 4 and 5) that control spectral sensitivity.
机译:背景进化专业化会导致进化约束吗?这似乎是合理的,尤其是在专业化导致复杂适应性丧失的情况下。在猫头鹰猴的血统中,夜间活动显然是由昼夜祖先引起的。这种行为上的变化伴随着眼睛和眼眶的形态变化,以及通过短波敏感视觉色素(SWS opsin)编码基因的错义突变,使色觉完全丧失。有趣的是,至少有一种猫头鹰猴亚扎拉的猫头鹰猴(Aotus azarae azarae)在白天恢复了活动。鉴于所有在白天活跃的灵长类动物物种,包括主要是昼夜物种和白天和黑夜都活跃的物种,至少具有双色色觉,因此提出双色性在A. a。中具有适应性似乎是合理的。阿扎雷亚。在SWS视蛋白被禁用的情况下,阿扎拉(Azara)猫头鹰猴子重新进化色觉的主要途径是通过完整的X连锁视蛋白基因座中的多态性,这种现象通常发生在其他新大陆猴子中。为了检验这种可能性,我们分析了A.a.的X连锁视蛋白的变化。 azarae,重点介绍控制光谱灵敏度的三个外显子(3、4和5)。

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