Interchromosomal communication coordinates intrinsically stochastic expression between alleles.

Interchromosomal communication coordinates intrinsically stochastic expression between alleles.
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DOI:
10.1126/science.1243039
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发表时间:
2014-02-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Desplan C
Desplan C
中科院分区:
其他
文献类型:
--
作者:
Johnston RJ Jr;Desplan C

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感觉系统使用随机机制来使神经元亚型多样化。在果蝇眼中,PAS-bHLH转录因子Spineless(Ss)的随机表达决定了R7光感受器中随机的二元亚型选择。在这里,我们表明,一个随机的,细胞自主的决定,表达SS是由每个SS轨迹本质上。每个ss等位基因的随机开或关表达由来自一个增强子和两个在远距离作用的沉默子的组合输入决定。然而,这两个ss等位基因也通过上调和下调等位基因间串扰平均其表达频率。这种染色体间或染色体内的长程调控不需要内源性ss染色体定位或配对。因此,尽管单个ss等位基因做出独立的随机选择,但染色体间通讯协调等位基因之间的表达状态,确保它们都在R7的相同随机子集中表达。
Sensory systems use stochastic mechanisms to diversify neuronal subtypes. In the Drosophila eye, stochastic expression of the PAS-bHLH transcription factor Spineless (Ss) determines a random binary subtype choice in R7 photoreceptors. Here, we show that a stochastic, cell-autonomous decision to express ss is made intrinsically by each ss locus. Stochastic on or off expression of each ss allele is determined by combinatorial inputs from one enhancer and two silencers acting at long range. However, the two ss alleles also average their frequency of expression through upregulatory and downregulatory interallelic cross-talk. This inter- or intra-chromosomal long-range regulation does not require endogenous ss chromosomal positioning or pairing. Therefore, although individual ss alleles make independent stochastic choices, interchromosomal communication coordinates expression state between alleles, ensuring that they are both expressed in the same random subset of R7s.
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