Transkripcijski regulator ATRX
Transkripcijski regulator ATRX znan i kao ATP-ovisna helikaza ATRX, X-vezana helikaza II, ili X-vezani jedarni protein (XNP) jest protein koji je kod ljudi kodiran genom ATRX sa hromosoma X.[5][6][7]
Aminokiselinska sekvenca
urediDužina polipeptidnog lanca je 2.492 aminokiseline, a molekulska težina 282.586 Da.[7]
10 | 20 | 30 | 40 | 50 | ||||
---|---|---|---|---|---|---|---|---|
MTAEPMSESK | LNTLVQKLHD | FLAHSSEESE | ETSSPPRLAM | NQNTDKISGS | ||||
GSNSDMMENS | KEEGTSSSEK | SKSSGSSRSK | RKPSIVTKYV | ESDDEKPLDD | ||||
ETVNEDASNE | NSENDITMQS | LPKGTVIVQP | EPVLNEDKDD | FKGPEFRSRS | ||||
KMKTENLKKR | GEDGLHGIVS | CTACGQQVNH | FQKDSIYRHP | SLQVLICKNC | ||||
FKYYMSDDIS | RDSDGMDEQC | RWCAEGGNLI | CCDFCHNAFC | KKCILRNLGR | ||||
KELSTIMDEN | NQWYCYICHP | EPLLDLVTAC | NSVFENLEQL | LQQNKKKIKV | ||||
DSEKSNKVYE | HTSRFSPKKT | SSNCNGEEKK | LDDSCSGSVT | YSYSALIVPK | ||||
EMIKKAKKLI | ETTANMNSSY | VKFLKQATDN | SEISSATKLR | QLKAFKSVLA | ||||
DIKKAHLALE | EDLNSEFRAM | DAVNKEKNTK | EHKVIDAKFE | TKARKGEKPC | ||||
ALEKKDISKS | EAKLSRKQVD | SEHMHQNVPT | EEQRTNKSTG | GEHKKSDRKE | ||||
EPQYEPANTS | EDLDMDIVSV | PSSVPEDIFE | NLETAMEVQS | SVDHQGDGSS | ||||
GTEQEVESSS | VKLNISSKDN | RGGIKSKTTA | KVTKELYVKL | TPVSLSNSPI | ||||
KGADCQEVPQ | DKDGYKSCGL | NPKLEKCGLG | QENSDNEHLV | ENEVSLLLEE | ||||
SDLRRSPRVK | TTPLRRPTET | NPVTSNSDEE | CNETVKEKQK | LSVPVRKKDK | ||||
RNSSDSAIDN | PKPNKLPKSK | QSETVDQNSD | SDEMLAILKE | VSRMSHSSSS | ||||
DTDINEIHTN | HKTLYDLKTQ | AGKDDKGKRK | RKSSTSGSDF | DTKKGKSAKS | ||||
SIISKKKRQT | QSESSNYDSE | LEKEIKSMSK | IGAARTTKKR | IPNTKDFDSS | ||||
EDEKHSKKGM | DNQGHKNLKT | SQEGSSDDAE | RKQERETFSS | AEGTVDKDTT | ||||
IMELRDRLPK | KQQASASTDG | VDKLSGKEQS | FTSLEVRKVA | ETKEKSKHLK | ||||
TKTCKKVQDG | LSDIAEKFLK | KDQSDETSED | DKKQSKKGTE | EKKKPSDFKK | ||||
KVIKMEQQYE | SSSDGTEKLP | EREEICHFPK | GIKQIKNGTT | DGEKKSKKIR | ||||
DKTSKKKDEL | SDYAEKSTGK | GDSCDSSEDK | KSKNGAYGRE | KKRCKLLGKS | ||||
SRKRQDCSSS | DTEKYSMKED | GCNSSDKRLK | RIELRERRNL | SSKRNTKEIQ | ||||
SGSSSSDAEE | SSEDNKKKKQ | RTSSKKKAVI | VKEKKRNSLR | TSTKRKQADI | ||||
TSSSSSDIED | DDQNSIGEGS | SDEQKIKPVT | ENLVLSSHTG | FCQSSGDEAL | ||||
SKSVPVTVDD | DDDDNDPENR | IAKKMLLEEI | KANLSSDEDG | SSDDEPEEGK | ||||
KRTGKQNEEN | PGDEEAKNQV | NSESDSDSEE | SKKPRYRHRL | LRHKLTVSDG | ||||
ESGEEKKTKP | KEHKEVKGRN | RRKVSSEDSE | DSDFQESGVS | EEVSESEDEQ | ||||
RPRTRSAKKA | ELEENQRSYK | QKKKRRRIKV | QEDSSSENKS | NSEEEEEEKE | ||||
EEEEEEEEEE | EEEEDENDDS | KSPGKGRKKI | RKILKDDKLR | TETQNALKEE | ||||
EERRKRIAER | EREREKLREV | IEIEDASPTK | CPITTKLVLD | EDEETKEPLV | ||||
QVHRNMVIKL | KPHQVDGVQF | MWDCCCESVK | KTKKSPGSGC | ILAHCMGLGK | ||||
TLQVVSFLHT | VLLCDKLDFS | TALVVCPLNT | ALNWMNEFEK | WQEGLKDDEK | ||||
LEVSELATVK | RPQERSYMLQ | RWQEDGGVMI | IGYEMYRNLA | QGRNVKSRKL | ||||
KEIFNKALVD | PGPDFVVCDE | GHILKNEASA | VSKAMNSIRS | RRRIILTGTP | ||||
LQNNLIEYHC | MVNFIKENLL | GSIKEFRNRF | INPIQNGQCA | DSTMVDVRVM | ||||
KKRAHILYEM | LAGCVQRKDY | TALTKFLPPK | HEYVLAVRMT | SIQCKLYQYY | ||||
LDHLTGVGNN | SEGGRGKAGA | KLFQDFQMLS | RIWTHPWCLQ | LDYISKENKG | ||||
YFDEDSMDEF | IASDSDETSM | SLSSDDYTKK | KKKGKKGKKD | SSSSGSGSDN | ||||
DVEVIKVWNS | RSRGGGEGNV | DETGNNPSVS | LKLEESKATS | SSNPSSPAPD | ||||
WYKDFVTDAD | AEVLEHSGKM | VLLFEILRMA | EEIGDKVLVF | SQSLISLDLI | ||||
EDFLELASRE | KTEDKDKPLI | YKGEGKWLRN | IDYYRLDGST | TAQSRKKWAE | ||||
EFNDETNVRG | RLFIISTKAG | SLGINLVAAN | RVIIFDASWN | PSYDIQSIFR | ||||
VYRFGQTKPV | YVYRFLAQGT | MEDKIYDRQV | TKQSLSFRVV | DQQQVERHFT | ||||
MNELTELYTF | EPDLLDDPNS | EKKKKRDTPM | LPKDTILAEL | LQIHKEHIVG | ||||
YHEHDSLLDH | KEEEELTEEE | RKAAWAEYEA | EKKGLTMRFN | IPTGTNLPPV | ||||
SFNSQTPYIP | FNLGALSAMS | NQQLEDLINQ | GREKVVEATN | SVTAVRIQPL | ||||
EDIISAVWKE | NMNLSEAQVQ | ALALSRQASQ | ELDVKRREAI | YNDVLTKQQM | ||||
LISCVQRILM | NRRLQQQYNQ | QQQQQMTYQQ | ATLGHLMMPK | PPNLIMNPSN | ||||
YQQIDMRGMY | QPVAGGMQPP | PLQRAPPPMR | SKNPGPSQGK | SM |
Funkcija
urediTranskripcijski regulator ATRX sadrži domen ATPaza/helikaza i stoga pripada SWI/SNF porodici proteina hromatinskog remodeliranja. ATRX je neophodan za taloženje histonske varijante H3.3 na telomerama i drugih genomskih ponavljanja.[8] Ove interakcije su važne za održavanje utišavanja na ovim lokusima.[9][10][11]
Osim toga, ATRX prolazi kroz fosforilacije ovisno o ćelijskom ciklusu, koje reguliraju njegovu jedarnu matricu i asocijaciju hromatina, sugerirajući njegovu uključenost u regulaciju gena u interfazi i hromosomsku segregaciju u mitozi.[7]
Klinički značaj
urediNaslijeđene mutacije
urediNaslijeđene mutacije gena ATRX povezane su sa X-vezanim sindromom mentalne retardacije (XLMR) sindromom koji je najčešće praćen alfa-talasemijjskim sindromom mentalne retardacije (sindrom ATR-X). Pokazalo se da ove mutacije uzrokuju različite promjene u obrascu metilacije DNK, što može potvrditi vezu između remodeliranja hromatina, metilacije DNK i ekspresije gena u razvojnim procesima. Zabilježeno je više alternativno prertađemih varijanti transkripta koje kodiraju različite izoforme. Žene nositeljice mogu pokazati iskrivljenu inaktivacija X hromosoma.[7]
Somatske mutacije
urediStečene mutacije u ATRX-u prijavljene su u brojnim ljudskim karcinomima, uključujući neuroendokrine tumore pankreasa,[12] gliome,[13] astrocitome,[14] osteosarkome,[15] i maligne feohromocitome.[16] Postoji jaka korelacija između ATRX mutacija i fenotipa alternativne elongacije telomera (ALT) kod karcinoma.[12]
Interakcije
urediATRX formira kompleks sa DAXX koji je šaperon histona H3.3.[17]
Također se pokazalo da ATRX ima interakcije sa EZH2.[18]
Tgakođer pogledajte
urediReference
uredi- ^ a b c GRCh38: Ensembl release 89: ENSG00000085224 - Ensembl, maj 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000031229 - Ensembl, maj 2017
- ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ Stayton CL, Dabovic B, Gulisano M, Gecz J, Broccoli V, Giovanazzi S, et al. (novembar 1994). "Cloning and characterization of a new human Xq13 gene, encoding a putative helicase". Human Molecular Genetics. 3 (11): 1957–64. doi:10.1093/hmg/3.11.1957. PMID 7874112.
- ^ Gibbons RJ, Suthers GK, Wilkie AO, Buckle VJ, Higgs DR (novembar 1992). "X-linked alpha-thalassemia/mental retardation (ATR-X) syndrome: localization to Xq12-q21.31 by X inactivation and linkage analysis". American Journal of Human Genetics. 51 (5): 1136–49. PMC 1682840. PMID 1415255.
- ^ a b c d "Entrez Gene: ATRX alpha thalassemia/mental retardation syndrome X-linked (RAD54 homolog, S. cerevisiae)".
- ^ Wong LH, McGhie JD, Sim M, Anderson MA, Ahn S, Hannan RD, et al. (mart 2010). "ATRX interacts with H3.3 in maintaining telomere structural integrity in pluripotent embryonic stem cells". Genome Research. 20 (3): 351–60. doi:10.1101/gr.101477.109. PMC 2840985. PMID 20110566.
- ^ Voon HP, Hughes JR, Rode C, De La Rosa-Velázquez IA, Jenuwein T, Feil R, et al. (april 2015). "ATRX Plays a Key Role in Maintaining Silencing at Interstitial Heterochromatic Loci and Imprinted Genes". Cell Reports. 11 (3): 405–18. doi:10.1016/j.celrep.2015.03.036. PMC 4410944. PMID 25865896.
- ^ Elsässer SJ, Noh KM, Diaz N, Allis CD, Banaszynski LA (juni 2015). "Histone H3.3 is required for endogenous retroviral element silencing in embryonic stem cells". Nature. 522 (7555): 240–4. doi:10.1038/nature14345. PMC 4509593. PMID 25938714.
- ^ Udugama M, M Chang FT, Chan FL, Tang MC, Pickett HA, R McGhie JD, et al. (decembar 2015). "Histone variant H3.3 provides the heterochromatic H3 lysine 9 tri-methylation mark at telomeres". Nucleic Acids Research. 43 (21): 10227–37. doi:10.1093/nar/gkv847. PMC 4666390. PMID 26304540.
- ^ a b Heaphy CM, de Wilde RF, Jiao Y, Klein AP, Edil BH, Shi C, et al. (juli 2011). "Altered telomeres in tumors with ATRX and DAXX mutations". Science. 333 (6041): 425. doi:10.1126/science.1207313. PMC 3174141. PMID 21719641.
- ^ Schwartzentruber J, Korshunov A, Liu XY, Jones DT, Pfaff E, Jacob K, et al. (januar 2012). "Driver mutations in histone H3.3 and chromatin remodelling genes in paediatric glioblastoma". Nature. 482 (7384): 226–31. doi:10.1038/nature10833. PMID 22286061. S2CID 4312169.
- ^ Kannan K, Inagaki A, Silber J, Gorovets D, Zhang J, Kastenhuber ER, et al. (oktobar 2012). "Whole-exome sequencing identifies ATRX mutation as a key molecular determinant in lower-grade glioma". Oncotarget. 3 (10): 1194–203. doi:10.18632/oncotarget.689. PMC 3717947. PMID 23104868.
- ^ Chen X, Bahrami A, Pappo A, Easton J, Dalton J, Hedlund E, et al. (april 2014). "Recurrent somatic structural variations contribute to tumorigenesis in pediatric osteosarcoma". Cell Reports. 7 (1): 104–12. doi:10.1016/j.celrep.2014.03.003. PMC 4096827. PMID 24703847.
- ^ Comino-Méndez, I (juni 2016). "ATRX driver mutation in a composite malignant pheochromocytoma". Cancer Genetics. 209 (6): 272–7. doi:10.1016/j.cancergen.2016.04.058. PMID 27209355.
- ^ Lewis PW, Elsaesser SJ, Noh KM, Stadler SC, Allis CD (august 2010). "Daxx is an H3.3-specific histone chaperone and cooperates with ATRX in replication-independent chromatin assembly at telomeres". Proceedings of the National Academy of Sciences of the United States of America. 107 (32): 14075–80. doi:10.1073/pnas.1008850107. PMC 2922592. PMID 20651253.
- ^ Cardoso C, Timsit S, Villard L, Khrestchatisky M, Fontès M, Colleaux L (april 1998). "Specific interaction between the XNP/ATR-X gene product and the SET domain of the human EZH2 protein". Human Molecular Genetics. 7 (4): 679–84. doi:10.1093/hmg/7.4.679. PMID 9499421.
Dopunska literatura
uredi- Mulley JC, Kerr B, Stevenson R, Lubs H (1992). "Nomenclature guidelines for X-linked mental retardation". American Journal of Medical Genetics. 43 (1–2): 383–91. doi:10.1002/ajmg.1320430159. PMID 1605216.
- Tang P, Park DJ, Marshall Graves JA, Harley VR (septembar 2004). "ATRX and sex differentiation". Trends in Endocrinology and Metabolism. 15 (7): 339–44. doi:10.1016/j.tem.2004.07.006. PMID 15350606. S2CID 22192941.
- Forget BG (mart 2006). "De novo and acquired forms of alpha thalassemia". Current Hematology Reports. 5 (1): 11–4. PMID 16537041.
- Adès LC, Kerr B, Turner G, Wise G (septembar 1991). "Smith-Fineman-Myers syndrome in two brothers". American Journal of Medical Genetics. 40 (4): 467–70. doi:10.1002/ajmg.1320400419. PMID 1684092.
- Sutherland GR, Gedeon AK, Haan EA, Woodroffe P, Mulley JC (1988). "Linkage studies with the gene for an X-linked syndrome of mental retardation, microcephaly and spastic diplegia (MRX2)". American Journal of Medical Genetics. 30 (1–2): 493–508. doi:10.1002/ajmg.1320300152. PMID 3177467. CS1 održavanje: nepreporučeni parametar (link)
- Shapiro MB, Senapathy P (septembar 1987). "RNA splice junctions of different classes of eukaryotes: sequence statistics and functional implications in gene expression". Nucleic Acids Research. 15 (17): 7155–74. doi:10.1093/nar/15.17.7155. PMC 306199. PMID 3658675.
- Gibbons RJ, Picketts DJ, Villard L, Higgs DR (mart 1995). "Mutations in a putative global transcriptional regulator cause X-linked mental retardation with alpha-thalassemia (ATR-X syndrome)". Cell. 80 (6): 837–45. doi:10.1016/0092-8674(95)90287-2. PMID 7697714.
- Wang LH, Collins A, Lawrence S, Keats BJ, Morton NE (august 1994). "Integration of gene maps: chromosome X". Genomics. 22 (3): 590–604. doi:10.1006/geno.1994.1432. PMID 8001970.
- Gecz J, Pollard H, Consalez G, Villard L, Stayton C, Millasseau P, Khrestchatisky M, Fontes M (januar 1994). "Cloning and expression of the murine homologue of a putative human X-linked nuclear protein gene closely linked to PGK1 in Xq13.3". Human Molecular Genetics. 3 (1): 39–44. doi:10.1093/hmg/3.1.39. PMID 8162050.
- Villard L, Gecz J, Mattéi JF, Fontés M, Saugier-Veber P, Munnich A, Lyonnet S (april 1996). "XNP mutation in a large family with Juberg-Marsidi syndrome". Nature Genetics. 12 (4): 359–60. doi:10.1038/ng0496-359. PMID 8630485. S2CID 33759894.
- Bonaldo MF, Lennon G, Soares MB (septembar 1996). "Normalization and subtraction: two approaches to facilitate gene discovery". Genome Research. 6 (9): 791–806. doi:10.1101/gr.6.9.791. PMID 8889548.
- Picketts DJ, Higgs DR, Bachoo S, Blake DJ, Quarrell OW, Gibbons RJ (decembar 1996). "ATRX encodes a novel member of the SNF2 family of proteins: mutations point to a common mechanism underlying the ATR-X syndrome". Human Molecular Genetics. 5 (12): 1899–907. doi:10.1093/hmg/5.12.1899. PMID 8968741.
- Villard L, Lacombe D, Fontés M (1997). "A point mutation in the XNP gene, associated with an ATR-X phenotype without alpha-thalassemia". European Journal of Human Genetics. 4 (6): 316–20. doi:10.1159/000472225. PMID 9043863. S2CID 43618843.
- Villard L, Lossi AM, Cardoso C, Proud V, Chiaroni P, Colleaux L, Schwartz C, Fontés M (juli 1997). "Determination of the genomic structure of the XNP/ATRX gene encoding a potential zinc finger helicase". Genomics. 43 (2): 149–55. doi:10.1006/geno.1997.4793. PMID 9244431.
- Golub EI, Kovalenko OV, Gupta RC, Ward DC, Radding CM (oktobar 1997). "Interaction of human recombination proteins Rad51 and Rad54". Nucleic Acids Research. 25 (20): 4106–10. doi:10.1093/nar/25.20.4106. PMC 147015. PMID 9321665.
- Gibbons RJ, Bachoo S, Picketts DJ, Aftimos S, Asenbauer B, Bergoffen J, Berry SA, Dahl N, Fryer A, Keppler K, Kurosawa K, Levin ML, Masuno M, Neri G, Pierpont ME, Slaney SF, Higgs DR (oktobar 1997). "Mutations in transcriptional regulator ATRX establish the functional significance of a PHD-like domain". Nature Genetics. 17 (2): 146–8. doi:10.1038/ng1097-146. PMID 9326931. S2CID 12470300.
- Cardoso C, Timsit S, Villard L, Khrestchatisky M, Fontès M, Colleaux L (april 1998). "Specific interaction between the XNP/ATR-X gene product and the SET domain of the human EZH2 protein". Human Molecular Genetics. 7 (4): 679–84. doi:10.1093/hmg/7.4.679. PMID 9499421.
- Bérubé NG, Mangelsdorf M, Jagla M, Vanderluit J, Garrick D, Gibbons RJ, Higgs DR, Slack RS, Picketts DJ (februar 2005). "The chromatin-remodeling protein ATRX is critical for neuronal survival during corticogenesis". The Journal of Clinical Investigation. 115 (2): 258–67. doi:10.1172/JCI22329. PMC 544602. PMID 15668733.
Vanjski linkovi
uredi- GeneReviews/NCBI/NIH/UW entry on Alpha-Thalassemia X-Linked Mental Retardation Syndrome; ATRX Syndrome; Alpha Thalassemia/Mental Retardation, X-Linked; XLMR-Hypotonic Face Syndrome
- OMIM entries on Alpha-Thalassemia X-Linked Mental Retardation Syndrome
- Lokacija ljudskog genoma ATRX i stranica sa detaljima o genu ATRX u UCSC Genome Browseru.
- Lokacija ljudskog genoma RAD54L i stranica sa detaljima o genu RAD54L u UCSC Genome Browseru.