EVOLUTIONARY PROGRESSION AT SYNAPTIC CONNECTIONS MADE BY IDENTIFIED HOMOLOGOUS NEURONS
EVOLUTIONARY PROGRESSION AT SYNAPTIC CONNECTIONS MADE BY IDENTIFIED HOMOLOGOUS NEURONS
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DOI：
10.1073/pnas.83.20.7961
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发表时间：
1986-10-01
影响因子：
11.1
通讯作者：
MEINERTZHAGEN, IA
中科院分区：
文献类型：
--
作者：
SHAW, SR;MEINERTZHAGEN, IA
本文利用连续电镜对14个单系双翅目昆虫（家蝇、黑腹蝇、Bibio sp.、铜绿蝇、Gymnoplystia sp.、黑腹果蝇、Chorista sp.、nimapapoda、cingulipes Heteropsilopus、Dolichopus cuprinus、Neoaratus hercules、Chrysops sp.、Bombylius major、bebylius等）的同源突触后神经元形成的光受体突触进行了超微结构的比较研究。新刺虫，小菊，迷丝木，开窗木和双生木]。在所有的突触接触处都有一个突触前密集条，在系统发育较近的家族中，它被一个突触前平台所超越。横杆的对面是一对突触后元件，它们总是分别来自两个独特的单极神经元L1和L2。在近代的果蝇中，这两种元素都含有越来越复杂的蓄水池。在系统发育系列中，在最近的Muscomorpha中，突触后集合本身从原始的二分体结构转变为四分体结构，这是由于从一个无突细胞中添加了两个新的突触后元件。这种转变只在该系列中发生一次，根据化石记录，该系列涵盖了从延伸至2亿年前的茎线的分化。
A comparative ultrastructural study of photoreceptor synapses formed upon homologous postsynaptic neurones in insects has been made by using serial-section electron microscopy in representative Diptera from a monophyletic series of 14 families [Musca domestica, Melophagus ovinus, Bibio sp., Lucilia cuprina, Gymnoplystia sp., Drosophila melanogaster, Chorista sp., Nemapoda nitidula, Heteropsilopus cingulipes, Dolichopus cuprinus, Neoaratus hercules, Chrysops sp., Bombylius major, Neoexaireta spinigera, Microchrysa Polita, Rhagio mystacus, Sylvicola fenestralis and S. dubius]. At all of the synaptic contacts there is a presynaptic dense bar, surmounted in phylogenetically more recent families by a presynaptic platform. Opposite the bar lies a pair of postsynaptic elements that invariably originate one each from two unique monopolar neurones L1 and L2. Both elements contain increasingly elaborate cisternae in more recent flies. Within the phylogenetic series, the postsynaptic ensemble itself changes from the original dyad to a tetradic configuration in more recent Muscomorpha by the addition of two new postsynaptic elements from an amacrine cell. This transition occurs once only in the series, which, gauged by the fossil record, covers divergences from the stem line extending back > 200 million years.