heterochromia

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heterochromia

[‚hed·ə·rō′krō·mē·ə]
(physiology)
A condition in which the two irises of an individual have different colors, or in which one iris has two colors.
References in periodicals archive ?
The structure of heterochromatic DNA is altered in polyploid cells of Drosophila melanogaster.
These "on-off" transcription states are due to differences in histone modification leading to the formation of accessable, euchromatic (on) or condensed, heterochromatic (off) states (29).
The three species of Polybetes analyzed here show only small pericentromeric heterochromatic bands in all the chromosomes with no differential pycnosis of the sex chromosomes, although Olivera (1978) reported that "substantial" heterochromatic blocks were present in P.
Heterochromatic regions in the centromeric and paracentromeric parts of some chromosomes (1, 9, and 16), and the short arms of the acrocentric chromosomes were not included in the analysis because of suppression of Cot-1 DNA in these regions.
This difference suggests chromosome rearrangements, as for example, duplication and heterochromatin inversion during the evolution of this species, such that the positioning of a heterochromatic block on the telomere of the submetacentric pair of Ac.
In addition, DNA methylation is associated with heterochromatic regions (Beisel and Paro 2011), and somatic mutation density in human cancer genomes have been found to be highest in heterochromatin-like domains (Schuster-Bockler and Lehner 2012).
Mutations in SPECIFIC UBIQUITIN PROTEASE 32/UBIQUITIN-SPECIFIC PROTEASE 26 (SUP32/UBP26), an Arabidopsis deubiquitinating enzyme, result in decreased histone H3K9me2 levels, suppressed DNA methylation and release heterochromatic silencing.
They cover the structure and protein interactions of the nuclear envelope; the nucleocytoplasmic barrier and beyond in the plant nuclear pore complex; the functional organization of filaments in the nucleus; genomics and chromatic packaging; heterochromatic positioning and nuclear architecture; the structure, dynamics, and function of telomeres in plant meiosis, and the nuclear pore complex in symbiosis and pathogen defense.
We employed a phenotypic screening assay in mouse erythroid leukemia cells that harbour a silenced green fluorescent protein (GFP) reporter transgene in order to isolate new components of heterochromatic silencing and identify compounds that have potential to de-repress tumour suppressor genes in cancer cells.
phrynostoma, and to verify the number, morphology and heterochromatic content of the chromosomes.
The Macuscope (Macuvision Europe Ltd), (Figure 1) is a machine that uses heterochromatic flicker photometry to assess macular pigment levels.
Apart from B-chromosomes, both euchromatic and heterochromatic supernumerary chromosome segments have been shown to affect chromosome pairing especially in various insect species (e.