Heterochromatin, facultative
Heterochromatin that need not always be heterochromatic but has the faculty to return to the normal euchromatic state. The inactive X chromosome is made up of facultatative heterochromatin. When a woman transmits that X to a son, it reverts to euchromatin and genetic activity.

Medical dictionary. 2011.

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  • Heterochromatin — is a tightly packed form of DNA. Its major characteristic is that transcription is limited. As such, it is a means to control gene expression, through regulation of the transcription initiation.tructureChromatin is found in two varieties:… …   Wikipedia

  • facultative heterochromatin — facultative heterochromatin. См. факультативный гетерохроматин. (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.

  • Heterochromatin — A genetically inactive part of the genome, heterochromatin was so named because it was chromosomal material (chromatin) that stained differently, more darkly, all through the cell cycle, than most chromosomal material (which was named… …   Medical dictionary

  • heterochromatin — The chromosomal regions that are condensed during interphase and at the time of nuclear division. They show what is considered an abnormal pattern of staining as opposed to euchromatin. Can be subdivided into constitutive regions (present in all… …   Dictionary of molecular biology

  • facultative heterochromatin — fakultatyvusis heterochromatinas statusas T sritis augalininkystė apibrėžtis Heterochromatinas, laikinai susidarantis tam tikrais ląstelės gyvavimo periodais arba tam tikrose organizmo ląstelėse. atitikmenys: angl. facultative heterochromatin rus …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • facultative heterochromatin — That heterochromatin which is condensed in some cells and not in others, presumably representing stable differences in the activity of genes in different cells. The best known example results from the random inactivation of one of the pair of X… …   Dictionary of molecular biology

  • facultative heterochromatin — the chromatin in regions of the chromosomes that become heterochromatic in certain cells and tissues; e.g., it makes up the inactive X chromosome in female somatic cells …   Medical dictionary

  • Constitutive heterochromatin — domains are sections of DNA that occur throughout the chromosomes of eukaryotes, but particularly at the centromeres and telomeres. They often consist of very highly condensed, repetitive DNA and are largely transcriptionally silent. These… …   Wikipedia

  • гетерохроматин — heterochromatin гетерохроматин. Часть хроматина, находящаяся в конденсированном состоянии в интерфазе клеточного цикла, как правило, реплицируется позже эухроматина <euchromatin> и в основном составлен высокоповторяющимися… …   Молекулярная биология и генетика. Толковый словарь.

  • факультативный гетерохроматин — facultative heterochromatin факультативный гетерохроматин. Гетерохроматин <heterochromatin>, присутствующий только в одной из гомологичных пар хромосом, например, у инактивированной Х хромосомы <X inactivation> в процессе компенсации… …   Молекулярная биология и генетика. Толковый словарь.

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