Dosage effects of a Drosophila sodium channel gene on behavior and axonal excitability.

Dosage effects of a Drosophila sodium channel gene on behavior and axonal excitability.
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果蝇钠通道基因对行为和轴突兴奋性的剂量影响。

DOI:
10.1093/genetics/124.1.133
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发表时间:
1990
期刊:
影响因子:
3.3
通讯作者:
Ganetzky,B
Ganetzky,B
中科院分区:
生物学2区
文献类型:
--
作者:
Stern,M;Kreber,R;Ganetzky,B

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帕拉突变对果蝇行为和轴突兴奋性的影响表明帕拉特异性地影响钠通道。这一假设通过对帕拉基因座的分子分析得到证实,这表明编码的帕拉产物是钠通道多肽。在这里,我们描述了改变的帕拉+剂量对行为和轴突兴奋性的影响,无论是在其他野生型背景下,还是与其他两个突变相结合:napts,也影响钠通道,ShKS133,特别是影响钾通道。而它以前表明,减少剂量的帕拉+是无条件致命的napts背景下,我们发现,增加剂量的帕拉+抑制napts。类似地,我们发现,帕拉hypomorphs或降低剂量的帕拉+抑制ShKS 133,而增加剂量的帕拉+增强ShKS 133。这些影响的电生理基础进行了研究。果蝇中与钠通道具有序列同源性的其他基因没有显示出这样的剂量效应,这表明帕拉+产物具有不同于其他假定的果蝇钠通道基因的功能。我们的结论是,钠通道的数量存在于至少一些果蝇神经元可以通过改变帕拉+基因剂量的影响,和帕拉+的表达水平可以强烈影响神经元的兴奋性。
The effects of para mutations on behavior and axonal excitability in Drosophila suggested that para specifically affects sodium channels. This hypothesis was confirmed by molecular analysis of the para locus, which demonstrates that the encoded para product is a sodium channel polypeptide. Here we characterize the effects of altered para+ dosage on behavior and axonal excitability, both in an otherwise wild-type background and in combination with two other mutations: napts, which also affects sodium channels, and ShKS133, which specifically affects potassium channels. Whereas it was previously shown that decreased dosage of para+ is unconditionally lethal in a napts background, we find that increased dosage of para+ suppresses napts. Similarly, we find that para hypomorphs or decreased dosage of para+ suppresses ShKS133, whereas increased dosage of para+ enhances ShKS133). The electrophysiological basis for these effects is investigated. Other genes in Drosophila that have sequence homology to sodium channels do not show such dosage effects, which suggests that the para+ product has a function distinct from that of other putative Drosophila sodium channel genes. We conclude that the number of sodium channels present in at least some Drosophila neurons can be affected by changes in para+ gene dosage, and that the level of para+ expression can strongly influence neuronal excitability.
DOI: 10.1016/0014-4827(85)90506-3
发表时间: 1985
影响因子: 3.7
作者:
L. Gnessi;M. Ruff;F. Fraioli;C. Pert
通讯作者: C. Pert
DOI: 10.1016/s0021-9258(17)33330-6
发表时间: 1976
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: H. Lardy
DOI: 10.1016/s0021-9258(18)32420-7
发表时间: 1983-05
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: D. Babcock
DOI: 10.1073/pnas.76.11.5699
发表时间: 1979
影响因子: 11.1
作者:
R. Hyne;D. Garbers
通讯作者: D. Garbers
用捕获的 pH 探针研究海胆精子鞭毛膜囊泡中电压敏感的 Na /H 交换。
DOI: --
发表时间: 1985
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Lee,HC