Differential segregation and modification of mRNA during spermiogenesis in Marsilea vestita

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The fine structure of fertilization in the fern Marsilea vestita.

The ultrastructural details of fertilization in the fern Marsilea vestita, including gamete approach and fusion, the fate of the spermatozoid organelles and the development of a possible block to polyspermy are described. The spermatozoid approaches the egg through layers of mucilage that surround the megaspores. It moves down the neck of the archegonium into the cavity above the egg. In order ...

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Spermiogenesis in the fern Marsilea microtubules, nuclear shaping, and cytomorphogenesis.

Spermiogenesis in Marsilea is a complex series of events, including the formation of a helically wound organelle coil. The coil begins to appear in early development when a multilayered structure (MLS) is formed de novo in association with a mitochondrion. The outermost layer of the MLS is a ribbon of microtubules. As the microtubules grow out from the MLS, they grow along the nuclear envelope....

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Cell cycle arrest allows centrin translation but not basal body formation during spermiogenesis in Marsilea.

Spermiogenesis in the water fern Marsilea vestita is a rapid process that requires the de novo formation of basal bodies in a cytoplasmic particle known as a blepharoplast. Spermiogenesis is activated by placing dry spores into water and is dependent upon the translation of new proteins from stored mRNAs with little, if any, new transcription. We looked at the necessity of cell division cycles ...

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Expression of protamine-1 and -2 mRNA during human spermiogenesis.

During spermiogenesis, the histone-to-protamine replacement causes the compaction of the spermatid chromatin. The genes for protamines, PRM-1 and PRM-2, are transcribed in round and elongating spermatids. The transcripts are stored in a translationally-repressed state by the binding of protein repressors before being translated in elongating and elongated spermatids. RNA extracts from homogeniz...

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ژورنال

عنوان ژورنال: Developmental Biology

سال: 2004

ISSN: 0012-1606

DOI: 10.1016/j.ydbio.2004.02.002