File:Amphibian oocyte transcription.jpg

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Amphibian oocyte transcription

Amphibian oocyte nuclei contain numerous extra-chromosomal nuclei, each of which contains a tandem array of genes encoding ribosomal RNA. Active transcription is seen by the tree-like structures in which each branch represents a growing transcript. Untranscribed spacer DNA is seen between each transcript.


Methods developed by O.L. Miller Jr. and colleagues, the extra-chromosomal nuclei from a newt oocyte have been dispersed in low salt, and centrifuged through a sucrose cushion containing formaldehyde on to a carbon coated grid.


Links: Molecular Development - Ribonucleic acid

Reference

Fawcett DW. The Cell Chapter 4 Nucleus, Figure 144.

Micrograph courtesy of Oscar Miller.

Original Image: The Cell: An Image Library CIL:11043 http://www.cellimagelibrary.org/images/11043 original image has been rotated 90 degrees.

Copyright

Licensing: Attribution Non-Commercial; No Derivatives:This image is licensed under a Creative Commons Attribution, Non-Commercial, No Derivatives License.

NCBI Organism Classification: Notophthalmus viridescens Cell Type: oocyte Cellular Component: nucleolar chromatin


Cite this page: Hill, M.A. (2024, April 24) Embryology Amphibian oocyte transcription.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Amphibian_oocyte_transcription.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current07:22, 26 April 2011Thumbnail for version as of 07:22, 26 April 20111,200 × 841 (475 KB)S8600021 (talk | contribs)==Amphibian oocyte transcription== Figure 144 from Chapter 4 (Nucleus) of 'The Cell' by Don W. Fawcett M.D. Amphibian oocyte nuclei contain numerous extra-chromosomal nuclei, each of which contains a tandem array of genes encoding ribosomal RNA. Here,