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Chromosomal material that is genetically active and stains lightly with basic dyes.

eu′chro·mat′ic (yo͞o′krō-măt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Genetics) the part of a chromosome that constitutes the major genes and does not stain strongly with basic dyes when the cell is not dividing. Compare heterochromatin
euchromatic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(yuˈkroʊ mə tɪn)

the part of a chromosome that condenses maximally during metaphase and contains most of the genetically active material.
[1930–35; < German (1928); see eu-, chromatin]
eu`chro•mat′ic (-krəˈmæt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The oocytes had a euchromatin nucleus at the germinal vesicle stage and the granulosa and theca cell nuclei showed peripheral aggregations of heterochromatin.
Furthermore, the use of aniline blue staining revealed the granulosa cells in the control culture showed the round nuclei of euchromatin in the centre of their cytoplasm.
The eukaryotic DNA consists of transcriptionally active DNA called Euchromatin and transcriptionaly incompetent DNA that is Heterochromatin.
Unmethylated or hypomethylated DNA participates to the formation of an open (or active or unrepressed) euchromatin structure which allows the high levels of gene expression needed for ESCs to differentiate in various lineages.
In euchromatin, widely interspersed retrotransposons demonstrate nonrandom and TE-sequence-specific chromosomal clustering [43] (present work, Figure 2), indicating the TEs' impact on the genome architecture and diversification.
Generally, the complexes catalyze the formation of repressive epigenetic marks at histone 3 such as H3K27 and H3K9, a hallmark of heterochromatic regions, and the permissive H3K4 mark, which is associated with the formation of euchromatin [104].
A heterozygous microdeletion at chromosome 9q34.3 overlapping the euchromatin histone methyltransferase 1 (EHMT1) gene accounts for more than 75% of cases, and the remainder are associated with a heterozygous intragenic pathogenic variant in the EHMT1 gene [1, 2].
The protein concentrates in euchromatin regions that correspond to a highly transcribed part of the chromosome.
OLs of the isolated mice displayed increased euchromatin and decreased heterochromatin, indicating a less differentiated state [47].
Posttranscriptional histone modifications (PTM) play a critical role in chromatin structure acquiring two configurations, one more closed (heterochromatin) and inactive and another less compact (euchromatin) and associated with active gene transcription.
We pioneered the concept that [NAD.sup.+] redox and intermediary metabolism sensors sirtuin1 (SIRT1) and sirtuin6 (SIRT6) epigenetically reprogram the universal attributes of resistance to tolerance in monocytes by shifting glycolysis and glucose oxidation high energy use to the low energy state lipolysis by generating silent heterochromatin at selective sets of immune and metabolism fueling gene sets (TNF[alpha]) [4, 5] and maintaining open euchromatin at reciprocally functioning gene sets [6-8].
The nuclei are characterized by patches of euchromatin and heterochromatin regions with the latter usually occupying the periphery of the organelle.