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Novel alternative splicing of GABA receptor RDL exon 9 from Laodelphax striatellus modulates agonist potency
Insect Science ( IF 4 ) Pub Date : 2020-08-24 , DOI: 10.1111/1744-7917.12789
Jie Jiang 1 , Li-Xin Huang 1 , Feng Chen 1 , Cheng-Wang Sheng 1, 2 , Qiu-Tang Huang 1 , Zhao-Jun Han 1 , Chun-Qing Zhao 1
Affiliation  

The resistance to dieldrin gene (RDL) encodes the primary subunit of the insect ionotropic γ-aminobutyric acid (GABA) receptor (GABAR), which is the target of phenylpyrazole and isoxazoline insecticides. The splice variants in exons 3 and 6 of RDL, which have been widely explored in many insects, modulate the agonist potency of the homomeric RDL GABAR and potentially play an important role in the development of insects. In the present study, four splice variants of exon 9 were identified in RDL of the small brown planthopper, Laodelphax striatellus (LsRDL), resulting in LsRDL-9a, LsRDL-9a', LsRDL-9b, and LsRDL-9c. LsRDL-9a has one more amino acid (E, glutamic acid) compared with LsRDL-9a', and LsRDL-9b lacked two amino acids and had seven different amino acids compared with LsRDL-9c. Two-electrode voltage clamp recording on LsRDLs expressed in Xenopus oocytes showed that alternative splicing of exon 9 has significant impact on LsRDL sensitivity to the agonists GABA and β-alanine, whereas no significant difference was observed in the potencies of the non-competitive antagonists (NCAs) ethiprole and fluralaner on the splice variants. Our results suggest that alternative splicing of RDL exon 9 broadens functional capabilities of the GABAR in L. striatellus by influencing the action of GABA. This article is protected by copyright. All rights reserved.

中文翻译:

灰飞虱 GABA 受体 RDL 外显子 9 的新型选择性剪接调节激动剂效力

狄氏剂抗性基因 (RDL) 编码昆虫离子型 γ-氨基丁酸 (GABA) 受体 (GABAR) 的主要亚基,该受体是苯基吡唑和异恶唑啉类杀虫剂的靶标。RDL 外显子 3 和 6 中的剪接变体已在许多昆虫中得到广泛研究,可调节同聚 RDL GABAR 的激动剂效力,并可能在昆虫发育中发挥重要作用。在本研究中,在小型褐飞虱灰飞虱 (LsRDL) 的 RDL 中鉴定了外显子 9 的四个剪接变体,导致 LsRDL-9a、LsRDL-9a'、LsRDL-9b 和 LsRDL-9c。与LsRDL-9a'相比,LsRDL-9a多一个氨基酸(E,谷氨酸),而LsRDL-9b与LsRDL-9c相比缺少2个氨基酸,有7个不同的氨基酸。在非洲爪蟾卵母细胞中表达的 LsRDLs 上的双电极电压钳记录表明,外显子 9 的可变剪接对 LsRDL 对激动剂 GABA 和 β-丙氨酸的敏感性有显着影响,而在非竞争性拮抗剂的效力上没有观察到显着差异。 NCAs) 剪接变体上的乙虫腈和氟拉纳。我们的结果表明,RDL 外显子 9 的选择性剪接通过影响 GABA 的作用拓宽了 L. striatellus 中 GABAR 的功能能力。本文受版权保护。版权所有。而在非竞争性拮抗剂 (NCA) 乙虫腈和氟拉纳对剪接变体的效力方面没有观察到显着差异。我们的结果表明,RDL 外显子 9 的选择性剪接通过影响 GABA 的作用拓宽了灰霉病菌中 GABAR 的功能能力。本文受版权保护。版权所有。而在非竞争性拮抗剂 (NCA) 乙虫腈和氟拉纳对剪接变体的效力方面没有观察到显着差异。我们的结果表明,RDL 外显子 9 的选择性剪接通过影响 GABA 的作用拓宽了 L. striatellus 中 GABAR 的功能能力。本文受版权保护。版权所有。
更新日期:2020-08-24
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