Endoreduplication


Endoreduplication

Endoreduplication is the duplication of the genome without mitosis. Endoreduplication is a common process in eukaryotes and results in an increase in the nuclear DNA content, permitting amplification of the genome of specialized cells. Moreover, the increase in the ploidy level correlates with an increase in nuclear volume and cell size, suggesting that elevated nuclear DNA content is required to maintain larger cells. In animals, endoreduplication is most frequent in Appendicularia, where endoreduplicated epithelial cells are used to produce feeding structures, and in arthropods, where the highest value of the endopolyploidy occur in the Malpighian tubules and salivary glands of various dipters. In mammals, endopolyploidy is rare and evident only in the trophoblast, decidua and myocardial cells. In contrast, endoreduplication is widespread in plants, particularly in angiosperms, and may occur in any cell types except the gametes, the meristematic and guard cells. The constant tissue-specific pattern of endopolyploidy in different organs suggest that endoreduplication cycles in plants constitute an essential part of the developmental programmes that are necessary for differentiation and for specialized function of given cells and tissues.

References

External Links:
* [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=10449413] Cebolla, A., J.M. Vinardell, E. Kiss, B. Olah, F. Roudier, A. Kondorosi and E. Kondorosi (1999) The mitotic inhibitor ccs52 is required for endoreduplication and ploidy-dependent cell enlargement in plants. Embo J. 18, 4476-4484.
* [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?CMD=search&DB=pubmed] Edgar, BA & Orr-Weaver, TL (2001) Endoreplication cell cycles: more for less. Cell. May 4;105(3):297-306


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Look at other dictionaries:

  • endoreduplication — endoreduplication. См. скрытый эндомитоз. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • endoreduplication — noun The replication of chromosomes without mitotic cell division …   Wiktionary

  • endoreduplication — A form of polyploidy or polysomy by redoubling of chromosomes, giving rise to four stranded chromosomes at prophase and metaphase. * * * en·do·re·du·pli·ca·tion (en″do re doo″plĭ kaґshən) replication of the chromosomes… …   Medical dictionary

  • endoreduplication — Chromosome reproduction during interphase. Four chromatid chromosomes (diplochromosomes) are seen during this phase …   Glossary of Biotechnology

  • end — • endoreduplication …   Dictionary of medical acronyms & abbreviations

  • скрытый эндомитоз — endoreduplication, masked endomitosis эндоредупликация, скрытый эндомитоз. Форма эндомитоза, характеризующаяся удвоением деспирализованных хромосом (т.е. без видимых признаков митоза); показателем степени Э. является размер ядра, а также число… …   Молекулярная биология и генетика. Толковый словарь.

  • Polyploide — Polyploïde Une cellule polyploïde (du grec : πολλαπλόν multiple) d un organisme contient plus de deux copies (ploïdie) de ses chromosomes. Les types polyploïdes sont appelés triploïde (3x), tétraploïde (4x), pentaploïde (5x), hexaploïde (6x) …   Wikipédia en Français

  • Polyploidïe — Polyploïde Une cellule polyploïde (du grec : πολλαπλόν multiple) d un organisme contient plus de deux copies (ploïdie) de ses chromosomes. Les types polyploïdes sont appelés triploïde (3x), tétraploïde (4x), pentaploïde (5x), hexaploïde (6x) …   Wikipédia en Français

  • Polyploïde — Paléopolyploïdie chez les eucaryotes …   Wikipédia en Français

  • Polyploïdie — Polyploïde Une cellule polyploïde (du grec : πολλαπλόν multiple) d un organisme contient plus de deux copies (ploïdie) de ses chromosomes. Les types polyploïdes sont appelés triploïde (3x), tétraploïde (4x), pentaploïde (5x), hexaploïde (6x) …   Wikipédia en Français


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