Sandbox Reserved 1491: Difference between revisions
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'''Genes expression''' is directly related to the '''condensation state''' of the [https://en.wikipedia.org/wiki/Chromatin chromatin]. Indeed, chromatin can be in the form of [https://en.wikipedia.org/wiki/Heterochromatin heterochromatin] (condensed form of DNA) or [https://en.wikipedia.org/wiki/Euchromatin euchromatin] (relaxed form of DNA) which correspond respectively to the transcriptionally silent and active forms of DNA. Chromatin is composed of DNA wrapped around [https://en.wikipedia.org/wiki/Histone histone] octamers forming nucleosomes<ref>Tamaru, H. “Confining Euchromatin/Heterochromatin Territory: Jumonji Crosses the Line.” Genes & Development 24, no. 14 (July 15, 2010): 1465–78. https://doi.org/10.1101/gad.1941010.</ref>. The '''histone tails residues''' can be [https://en.wikipedia.org/wiki/Acetylation acetylated], [https://en.wikipedia.org/wiki/Methylation methylated] or [https://en.wikipedia.org/wiki/Demethylation demethylated] by enzymes in order to modify chromatin state and therefore gene expression. Different types of proteins involved in this process exist, such as histone acetylase (HAT), histone methylase (HMT) or histone demethylase (HDM)<ref>Nasir Javaid, and Sangdun Choi. “Acetylation- and Methylation-Related Epigenetic Proteins in the Context of Their Targets.” Genes 8, no. 8 (August 7, 2017): 196. https://doi.org/10.3390/genes8080196</ref>. | '''Genes expression''' is directly related to the '''condensation state''' of the [https://en.wikipedia.org/wiki/Chromatin chromatin]. Indeed, chromatin can be in the form of [https://en.wikipedia.org/wiki/Heterochromatin heterochromatin] (condensed form of DNA) or [https://en.wikipedia.org/wiki/Euchromatin euchromatin] (relaxed form of DNA) which correspond respectively to the transcriptionally silent and active forms of DNA. Chromatin is composed of DNA wrapped around [https://en.wikipedia.org/wiki/Histone histone] octamers forming nucleosomes<ref>Tamaru, H. “Confining Euchromatin/Heterochromatin Territory: Jumonji Crosses the Line.” Genes & Development 24, no. 14 (July 15, 2010): 1465–78. https://doi.org/10.1101/gad.1941010.</ref>. The '''histone tails residues''' can be [https://en.wikipedia.org/wiki/Acetylation acetylated], [https://en.wikipedia.org/wiki/Methylation methylated] or [https://en.wikipedia.org/wiki/Demethylation demethylated] by enzymes in order to modify chromatin state and therefore gene expression. Different types of proteins involved in this process exist, such as histone acetylase (HAT), histone methylase (HMT) or histone demethylase (HDM)<ref>Nasir Javaid, and Sangdun Choi. “Acetylation- and Methylation-Related Epigenetic Proteins in the Context of Their Targets.” Genes 8, no. 8 (August 7, 2017): 196. https://doi.org/10.3390/genes8080196</ref>. | ||
Two families of [https://en.wikipedia.org/wiki/Demethylase histone-lysine demethylase] (KDM) have been identified as follows : the '''flavin (FAD)-dependent lysine-specific demethylases''' and the '''Fe(II)-dependent Jumonji C (JmjC) family'''. JmjC is subfamily of histone demethylases which regroups several proteins containing a specific catalytic domain called '''Jmjc''' found in ''' 2xml structure'''. KDM4 demethylases belong to the JmjC family and contains six members : KDM4A-F<ref>Labbé, Roselyne M., Andreana Holowatyj, and Zeng-Quan Yang. “Histone Lysine Demethylase (KDM) Subfamily 4: Structures, Functions and Therapeutic Potential.” American Journal of Translational Research 6, no. 1 (2013): 1–15</ref>. | Two families of [https://en.wikipedia.org/wiki/Demethylase histone-lysine demethylase] (KDM) have been identified as follows : the '''flavin (FAD)-dependent lysine-specific demethylases''' and the '''Fe(II)-dependent Jumonji C (JmjC) family'''. JmjC is subfamily of histone demethylases which regroups several proteins containing a specific catalytic domain called '''Jmjc''' found in ''' 2xml structure'''<ref>Shi, Y. G., and Y.-i. Tsukada. “The Discovery of Histone Demethylases.” Cold Spring Harbor Perspectives in Biology 5, no. 9 (September 1, 2013): a017947–a017947. https://doi.org/10.1101/cshperspect.a017947.</ref>. KDM4 demethylases belong to the JmjC family and contains six members : KDM4A-F<ref>Labbé, Roselyne M., Andreana Holowatyj, and Zeng-Quan Yang. “Histone Lysine Demethylase (KDM) Subfamily 4: Structures, Functions and Therapeutic Potential.” American Journal of Translational Research 6, no. 1 (2013): 1–15</ref>. | ||
[[Image:Reactionjpg.jpg | thumb | upright=3 | Enzymatic reaction of demethylation of H3K9(me3) and H3K36(me3) by KDM4C ]] | [[Image:Reactionjpg.jpg | thumb | upright=3 | Enzymatic reaction of demethylation of H3K9(me3) and H3K36(me3) by KDM4C ]] | ||
