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	{{Infobox ~~protein~~
	\| name = ~~NS5A~~		{{Infobox gene
	\| image = ~~NS5A_structure.png~~		\| name = NSD1
	\| caption = ~~Crystal structure of NS5A domain I~~		\| image = <!-- Image removed -->
	\| symbol = ~~NS5A~~		\| caption = <!-- Image caption removed -->
	\| ~~organism~~ = ~~Hepatitis C virus~~		\| symbol = NSD1
			\| alt_symbols = KMT3B, SOTOS, SOTOS1
			\| EntrezGene = 64324
			\| HGNCid = 7999
			\| OMIM = 606681
			\| RefSeq = NM_022455
			\| UniProt = Q96L73
			\| chromosome = 5
			\| arm = q
			\| band = 35
	}}		}}

	'''~~NS5A~~''' (~~Non~~-~~structural~~ protein 5A) is a ~~multifunctional~~ [[~~phosphoprotein~~]] ~~encoded by the~~ [[~~Hepatitis C virus~~]] ~~(HCV) genome. It plays a crucial role~~ in the ~~viral life cycle, including~~ [[~~viral replication~~]]~~, modulation of the host cell environment,~~ and ~~interaction with host cell signaling pathways~~. ~~NS5A~~ is ~~a target for antiviral drugs, particularly in the treatment of chronic~~ [[~~Hepatitis C~~]] ~~infection.~~		'''NSD1''' (Nuclear receptor-binding SET domain protein 1) is a [[gene]] that encodes a [[histone methyltransferase]] involved in the regulation of [[chromatin]] structure and [[gene expression]]. NSD1 is located on [[chromosome 5]] at the 5q35 region.

	~~==Structure==~~
	NS5A is a 447 amino acid protein that is divided into three domains: domain I, domain II, and domain III. The structure of domain I has been resolved by X-ray crystallography, revealing a unique fold that is essential for its function. Domains II and III are less well-characterized but are believed to be intrinsically disordered, allowing NS5A to interact with a variety of host and viral proteins.

	==Function==		== Function ==
	~~NS5A~~ is involved ~~in several key processes~~ in the ~~HCV life cycle:~~		NSD1 is a member of the [[SET domain]]-containing family of proteins, which are known to play a role in [[epigenetic]] regulation. The protein encoded by NSD1 is involved in the methylation of [[histone]] H3 at lysine 36 (H3K36), a modification associated with active [[transcription]].

	* '''Viral Replication''': NS5A is a ~~component of the~~ [[~~replication complex~~]] ~~that synthesizes viral RNA~~. ~~It interacts with~~ other ~~non-structural proteins such as~~ [[~~NS5B~~]] ~~(the viral RNA-dependent RNA polymerase)~~ and [[~~NS3~~]] ~~(a protease/helicase) to facilitate replication~~.		== Clinical significance ==
			Mutations in the NSD1 gene are associated with [[Sotos syndrome]], a disorder characterized by [[overgrowth]], advanced [[bone age]], and distinctive facial features. NSD1 mutations can also be involved in other [[developmental disorders]] and have been implicated in certain types of [[cancer]].

	* '''Modulation of ~~Host Cell Environment''': NS5A can alter host cell lipid metabolism~~ and [[~~autophagy~~]] ~~pathways, creating a favorable environment for viral replication~~.		=== Sotos syndrome ===
			Sotos syndrome, also known as cerebral gigantism, is an [[autosomal dominant]] condition. It is characterized by excessive physical growth during the first years of life, [[macrocephaly]], and [[learning disabilities]].

	* '''Interference with Host Immune Response''': NS5A can ~~inhibit the host's~~ [[~~interferon~~]] ~~response, helping the virus evade~~ the ~~immune system~~.		=== Cancer ===
			Alterations in NSD1 have been observed in various [[cancers]], including [[acute myeloid leukemia]] (AML) and [[neuroblastoma]]. NSD1 can act as an [[oncogene]] or a [[tumor suppressor gene]] depending on the context.

	==~~Clinical Significance~~==		== Interactions ==
	~~NS5A is a target for direct-acting antiviral (DAA) drugs used~~ in ~~the treatment of HCV infection. NS5A inhibitors, such as~~ [[~~ledipasvir]] and [[daclatasvir~~]], ~~have been developed to disrupt the function of NS5A, thereby inhibiting viral replication~~ and ~~reducing viral load in patients~~.		NSD1 interacts with several other proteins and factors involved in [[transcriptional regulation]], including nuclear receptors and other chromatin-modifying enzymes.

	==~~Research~~==		== See also ==
	Ongoing research is focused on understanding the precise mechanisms by which NS5A contributes to HCV pathogenesis and how it interacts with host cell factors. This knowledge is crucial for the development of more effective antiviral therapies.		* [[Histone methylation]]
			* [[Epigenetics]]
			* [[Chromatin remodeling]]

	==~~Also see~~==		== References ==
	* [[Hepatitis C virus]]		<references />
	* [[NS5B]]
	* [[NS3]]
	* [[Direct-acting antivirals]]
	* [[Interferon]]

	~~{{Hepatitis C virus}}~~		== External links ==
			* [https://www.ncbi.nlm.nih.gov/gene/64324 NSD1 gene - NCBI]
			* [https://ghr.nlm.nih.gov/gene/NSD1 NSD1 - Genetics Home Reference]

	[[Category:~~Hepatitis C~~]]		{{Genes on human chromosome 5}}
	[[Category:~~Viral proteins~~]]		[[Category:Genes on human chromosome 5]]
	[[Category:~~Virology~~]]		[[Category:Epigenetics]]
			[[Category:Histone-modifying enzymes]]
			[[Category:Oncogenes]]
			[[Category:Tumor suppressor genes]]

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2024-12-02T02:30:36Z

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{{Infobox protein
| name = NS5A
| image = NS5A_structure.png
| caption = Crystal structure of NS5A domain I
| symbol = NS5A
| organism = Hepatitis C virus
}}

'''NS5A''' (Non-structural protein 5A) is a multifunctional [[phosphoprotein]] encoded by the [[Hepatitis C virus]] (HCV) genome. It plays a crucial role in the viral life cycle, including [[viral replication]], modulation of the host cell environment, and interaction with host cell signaling pathways. NS5A is a target for antiviral drugs, particularly in the treatment of chronic [[Hepatitis C]] infection.

==Structure==
NS5A is a 447 amino acid protein that is divided into three domains: domain I, domain II, and domain III. The structure of domain I has been resolved by X-ray crystallography, revealing a unique fold that is essential for its function. Domains II and III are less well-characterized but are believed to be intrinsically disordered, allowing NS5A to interact with a variety of host and viral proteins.

==Function==
NS5A is involved in several key processes in the HCV life cycle:

* '''Viral Replication''': NS5A is a component of the [[replication complex]] that synthesizes viral RNA. It interacts with other non-structural proteins such as [[NS5B]] (the viral RNA-dependent RNA polymerase) and [[NS3]] (a protease/helicase) to facilitate replication.

* '''Modulation of Host Cell Environment''': NS5A can alter host cell lipid metabolism and [[autophagy]] pathways, creating a favorable environment for viral replication.

* '''Interference with Host Immune Response''': NS5A can inhibit the host's [[interferon]] response, helping the virus evade the immune system.

==Clinical Significance==
NS5A is a target for direct-acting antiviral (DAA) drugs used in the treatment of HCV infection. NS5A inhibitors, such as [[ledipasvir]] and [[daclatasvir]], have been developed to disrupt the function of NS5A, thereby inhibiting viral replication and reducing viral load in patients.

==Research==
Ongoing research is focused on understanding the precise mechanisms by which NS5A contributes to HCV pathogenesis and how it interacts with host cell factors. This knowledge is crucial for the development of more effective antiviral therapies.

==Also see==
* [[Hepatitis C virus]]
* [[NS5B]]
* [[NS3]]
* [[Direct-acting antivirals]]
* [[Interferon]]

{{Hepatitis C virus}}

[[Category:Hepatitis C]]
[[Category:Viral proteins]]
[[Category:Virology]]

NSD1 - Revision history

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