Metamorphosis and denucleation of the brain in the miniature wasp Megaphragma viggianii (Hymenoptera: Trichogrammatidae)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2022-09-01 DOI:10.1016/j.asd.2022.101200
Anastasia A. Makarova, Egor N. Veko, Alexey A. Polilov
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引用次数: 4

Abstract

Holometabolan brains undergo structural and allometric changes and complex reorganizations during metamorphosis. In minute egg parasitoids, brain formation is shifted to the late larva and young pupa, due to extreme de-embryonization. The brains of Megaphragma wasps undergo denucleation, the details of which remained unknown. We describe the morphological and volumetric changes in the brain of Megaphragma viggianii (Trichogrammatidae) during pupal development with emphasis on the lysis of nuclei and show that the absolute and relative volume of the brain decrease by a factor of 5 from prepupa to adult at the expense of the cell body rind. The first foci of lysis appear during early pupal development, but most nuclei (up to 97%) are lost between pharate adult and adult. The first signs of lysis (destruction of the nuclear envelopes) occur in pupae with red eyes. The number of lysis foci (organelle destruction and increasing number of lysosomes and degree of chromatin compaction) strongly increases in pupae with black eyes. The cell body rind volume strongly decreases during pupal development (in larger insects it increases slightly or remains unchanged). Elucidation of the lysis of nuclei in neurons and of the functioning of an anucleate brain is an important objective for neuroscience.

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微型维氏大黄蜂脑的变态和去核(膜翅目:赤眼蜂科)
全代谢脑在变态过程中经历结构和异速变化以及复杂的重组。在微小的卵类寄生物中,由于极端的去胚胎化,大脑的形成转移到晚期的幼虫和幼蛹。Megaphragma黄蜂的大脑经历了去核,其细节尚不清楚。我们描述了赤眼蜂科(Megaphragma viggianii)在蛹发育过程中大脑的形态和体积变化,重点是细胞核的溶解,并表明大脑的绝对和相对体积从蛹到成虫以牺牲细胞体表皮为代价减少了5倍。第一个核裂出现在蛹发育早期,但大部分核(高达97%)在成虫和成虫之间丢失。裂解(核膜破坏)的第一个迹象出现在蛹的红眼睛上。黑眼蛹的裂解灶数量(细胞器破坏、溶酶体数量增加和染色质压实程度)显著增加。在蛹发育过程中,细胞体外壳体积急剧减小(在较大的昆虫中,外壳体积略有增加或保持不变)。阐明神经元核的裂解和无核脑的功能是神经科学的一个重要目标。
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来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
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