No Evidence that Wnt Ligands Are Required for Planar Cell Polarity in Drosophila.

No Evidence that Wnt Ligands Are Required for Planar Cell Polarity in Drosophila.
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DOI:
10.1016/j.celrep.2020.108121
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发表时间:
2020-09-08
期刊:
影响因子:
8.8
通讯作者:
Perrimon N
Perrimon N
中科院分区:
生物学1区
文献类型:
--
作者:
Ewen-Campen B;Comyn T;Vogt E;Perrimon N

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卷曲 (fz) 和散乱 (dsh) 基因是平面细胞极性 (PCP) 通路和 Wnt 信号通路的高度保守成员。鉴于这些双重功能,一些研究已经检验了 Wnt 配体是否为发育过程中 PCP 的建立提供组织尺度的定向线索,并且这些研究得出了不同的结论。在这里,我们使用 split-Gal4 共表达分析、多重体细胞 CRISPR 和双 RNAi 实验在果蝇翅膀和 notum 中重新研究这个问题。通过体细胞 CRISPR 或 RNAi,针对 wg 和其他 Wnt 基因的成对功能丧失实验,不会在翅膀或背腹中产生 PCP 缺陷。此外,针对 evi(又名 Wntless)的体细胞 CRISPR(Wnt 配体分泌所需)并未产生可检测的 PCP 表型。总而言之,我们的结果不支持 Wnt 配体有助于果蝇翅膀或 notum 中 PCP 信号传导的假设。先前的研究对于 Wnt 配体是否为平面细胞极性途径提供组织水平的定向线索得出了不同的结论。埃文-坎彭等人。使用多重体内 CRISPR 和针对 Wnt 配体的双 RNAi 在果蝇中重新检查这个问题,没有发现任何证据表明 Wnt 是 PCP 图案化所必需的。
The frizzled (fz) and dishevelled (dsh) genes are highly conserved members of both the planar cell polarity (PCP) pathway and the Wnt signaling pathway. Given these dual functions, several studies have examined whether Wnt ligands provide a tissue-scale orientation cue for PCP establishment during development, and these studies have reached differing conclusions. Here, we re-examine this issue in the Drosophila melanogaster wing and notum using split-Gal4 co-expression analysis, multiplex somatic CRISPR, and double RNAi experiments. Pairwise loss-of-function experiments targeting wg together with other Wnt genes, via somatic CRISPR or RNAi, do not produce PCP defects in the wing or notum. In addition, somatic CRISPR against evi (aka wntless), which is required for the secretion of Wnt ligands, did not produce detectable PCP phenotypes. Altogether, our results do not support the hypothesis that Wnt ligands contribute to PCP signaling in the Drosophila wing or notum. Previous studies have come to differing conclusions on whether Wnt ligands provide a tissue-level orientation cue for the planar cell polarity pathway. Ewen-Campen et al. re-examine this question in Drosophila using multiplex in vivo CRISPR and double RNAi against Wnt ligands and find no evidence that Wnts are required for PCP patterning.
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