Halkka L, Halkka O
J Cell Sci. 1977 Aug;26:217-28. doi: 10.1242/jcs.26.1.217.
During the 3 years of nymphal development of the dragonfly Cordulia aenea, gene products slowly accumulate in the cytoplasm of the previtellogenic oocytes. Nuclear extrusions separate into nematosome and dense-mass components. The dense masses, RNP-containing globules of thightly packed fibrillar material, disperse throughout the oocyte cytoplasm. The last instar nymph experiences an obligatory diapause, after which oocyte development passes from mid to late previtellogenesis, and eventually to vitellogenesis proper in the adult. During diapause, annulate lamellae are induced within the dense masses. This process is continued during late previtellogenesis. The formation of annulate lamellae may be related to activation of some genetic message stored in the dense masses. The possibility of tubulin synthesis is discussed.
在蜻蜓铜色丽纹蜓若虫发育的3年期间，基因产物在卵黄发生前的卵母细胞细胞质中缓慢积累。核外突物分离成线虫体和致密物质成分。致密物质是含有核糖核蛋白的紧密堆积的纤维状物质小球，分散在整个卵母细胞细胞质中。末龄若虫经历强制性滞育，之后卵母细胞发育从前卵黄发生中期进入后期，最终在成虫期进入真正的卵黄发生阶段。在滞育期间，致密物质中诱导形成环状片层。这个过程在前卵黄发生后期持续进行。环状片层的形成可能与致密物质中储存的一些遗传信息的激活有关。文中讨论了微管蛋白合成的可能性。
