Developmental stages of ovarian follicles of the silkworm, <i>Bombyx mori</i> L

Yamauchi, Hiromoto; Yoshitake, Narumi

doi:10.1002/jmor.1051790104

Cited by 62 publications

(77 citation statements)

References 17 publications

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“…The ovarian capsule, in which the ovarioles are assembled and enclosed during larval and pupal development, ruptures and the developing ovarioles emerge gradually in the abdominal cavity (see Figure 12 below) (Yamauchi and Yoshitake, 1984). The removal of the ovarian capsule allows the follicles in the ovarioles to take up yolk proteins from the hemolymph and facilitates their direct exposure to growth factors that are found in it.…”

Section: P0190mentioning

confidence: 99%

Vitellogenesis and Post-Vitellogenic Maturation of the Insect Ovarian Follicle

Swevers

2005

Comprehensive Molecular Insect Science

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Section: P0190mentioning

confidence: 99%

Vitellogenesis and Post-Vitellogenic Maturation of the Insect Ovarian Follicle

Swevers

2005

Comprehensive Molecular Insect Science

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“…By comparing ovarian and early embryonic piRNA libraries, Malone et al identified two distinct pools of piRNAs-soma-dominant piRNAs, and germ line-enriched, maternally inherited piRNAs ). In the silkworm, ovarian development occurs exclusively during pupation and pharate adult development before hatching (Yamauchi and Yoshitake 1984). The structure of pharate adult ovary is nearly identical to that of flies (Yamauchi and Yoshitake 1984).…”

Section: Features Of Maternally Inherited Pirnasmentioning

confidence: 99%

“…In the silkworm, ovarian development occurs exclusively during pupation and pharate adult development before hatching (Yamauchi and Yoshitake 1984). The structure of pharate adult ovary is nearly identical to that of flies (Yamauchi and Yoshitake 1984). In contrast, the nature of the silkworm adult ovary is different from the fly adult ovary, as the silkworm adult ovary contains only matured eggs, which are mainly composed of germ line cells.…”

Section: Features Of Maternally Inherited Pirnasmentioning

confidence: 99%

Zygotic amplification of secondary piRNAs during silkworm embryogenesis

Kawaoka¹,

Kadota²,

Suzuki³

et al. 2011

RNA

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PIWI-interacting RNAs (piRNAs) are 23-30-nucleotide-long small RNAs that act as sequence-specific silencers of transposable elements in animal gonads. In flies, genetics and deep sequencing data have led to a hypothesis for piRNA biogenesis called the ping-pong cycle, where antisense primary piRNAs initiate an amplification loop to generate sense secondary piRNAs. However, to date, the process of the ping-pong cycle has never been monitored at work. Here, by large-scale profiling of piRNAs from silkworm ovary and embryos of different developmental stages, we demonstrate that maternally inherited antisense-biased piRNAs trigger acute amplification of secondary sense piRNA production in zygotes, at a time coinciding with zygotic transcription of sense transposon mRNAs. These results provide on-site evidence for the ping-pong cycle.

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“…During stage 1, eight cystocytes start to differentiate into oocytes or nurse cells as described above (Yamauchi and Yoshitake, 1984). A purpose of this experiment was to identify genes that control cystoblast differentiation into oocytes or nurse cells in B. mori.…”

Section: Introductionmentioning

confidence: 99%

SAGE analysis of early oogenesis in the silkworm, Bombyx mori

Funaguma

Hashimoto

Suzuki

et al. 2007

Insect Biochemistry and Molecular Biology

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To identify genes involved in the differentiation of Bombyx cystoblast, we constructed two 3' long serial analysis of gene expression (Long SAGE) libraries from stage 1-3 or stage 2-3 egg chambers and compared their gene expression profiles. In both libraries, the most frequent tags were derived from the same novel transcript. The transcript does not have any open reading frame capable of encoding a protein with over 100 amino acids in length. RNA blot analysis revealed that this transcript is specifically and abundantly expressed in the Bombyx ovary, mainly the germ line cells in the ovarioles. These results suggest that Bombyx oogenesis may be regulated by a previously unidentified non-coding RNA. Comparison of the gene expression profiles between the stage 1-3 and stage 2-3 egg chamber libraries revealed that 272 tags were significantly more abundant in stage 1-3 egg chambers (p<0.05 and at least two-fold change) than in library 2. Among the differentially expressed transcripts were the sequences that correspond to ATP synthase subunit d (3.1-fold enriched) and ATP synthase coupling factor 6 (9.1-fold enriched), suggesting that they are involved in regulation of cell cycle of cystocytes.

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Developmental stages of ovarian follicles of the silkworm, Bombyx mori L

Cited by 62 publications

References 17 publications

Vitellogenesis and Post-Vitellogenic Maturation of the Insect Ovarian Follicle

Vitellogenesis and Post-Vitellogenic Maturation of the Insect Ovarian Follicle

Zygotic amplification of secondary piRNAs during silkworm embryogenesis

SAGE analysis of early oogenesis in the silkworm, Bombyx mori

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