Menin ie protein koji je kod ljudi kodiran genom MEN1.[5] Menin je navodno supresor tumora povezan sa multiplom endokrinom neoplazijom tip 1 (MEN-1 sindrom).[6]

MEN1
Dostupne strukture
PDBPretraga ortologa: PDBe RCSB
Spisak PDB ID kodova

3U84, 3U85, 3U86, 3U88, 4GPQ, 4GQ3, 4GQ4, 4I80, 4OG3, 4OG4, 4OG5, 4OG6, 4OG7, 4OG8, 4X5Y, 4X5Z, 5DDF, 5DD9, 5DDA, 5DDE, 5DDB, 5DDD, 5DDC, 5DB0, 5DB3, 5DB1, 5DB2

Identifikatori
AliasiMEN1
Vanjski ID-jeviOMIM: 613733 MGI: 1316736 HomoloGene: 7418 GeneCards: MEN1
Lokacija gena (čovjek)
Hromosom 11 (čovjek)
Hrom.Hromosom 11 (čovjek)[1]
Hromosom 11 (čovjek)
Genomska lokacija za MEN1
Genomska lokacija za MEN1
Bend11q13.1Početak64,803,510 bp[1]
Kraj64,811,294 bp[1]
Lokacija gena (miš)
Hromosom 19 (miš)
Hrom.Hromosom 19 (miš)[2]
Hromosom 19 (miš)
Genomska lokacija za MEN1
Genomska lokacija za MEN1
Bend19|19 APočetak6,385,009 bp[2]
Kraj6,390,921 bp[2]
Obrazac RNK ekspresije
Više referentnih podataka o ekspresiji
Ontologija gena
Molekularna funkcija vezivanje sa DNK
protein-macromolecule adaptor activity
R-SMAD binding
protein N-terminus binding
chromatin binding
histone-lysine N-methyltransferase activity
GO:0001948, GO:0016582 vezivanje za proteine
four-way junction DNA binding
Y-form DNA binding
double-stranded DNA binding
Ćelijska komponenta citoplazma
citosol
nuclear matrix
nukleoplazma
Hromatin
cleavage furrow
jedro
histone methyltransferase complex
endoplasmic reticulum lumen
GO:0009327 makromolekulani kompleks
Biološki proces negative regulation of cell-substrate adhesion
GO:0033128 negative regulation of protein phosphorylation
positive regulation of transforming growth factor beta receptor signaling pathway
GO:0009373 regulation of transcription, DNA-templated
negative regulation of cyclin-dependent protein serine/threonine kinase activity
negative regulation of telomerase activity
negative regulation of cell cycle
regulation of activin receptor signaling pathway
GO:1901227 negative regulation of transcription by RNA polymerase II
negative regulation of DNA-binding transcription factor activity
negative regulation of osteoblast differentiation
negative regulation of cell cycle G1/S phase transition
MAPK cascade
cellular response to DNA damage stimulus
negative regulation of JNK cascade
brain development
cellular response to peptide hormone stimulus
decidualization
negative regulation of epithelial cell proliferation
GO:0007067 Mitoza
osteoblast development
positive regulation of protein binding
GO:0045996 negative regulation of transcription, DNA-templated
response to gamma radiation
response to UV
type B pancreatic cell differentiation
GO:0100026 Popravka DNK
regulation of type B pancreatic cell proliferation
cellular response to glucose stimulus
GO:0003257, GO:0010735, GO:1901228, GO:1900622, GO:1904488 positive regulation of transcription by RNA polymerase II
negative regulation of cell population proliferation
response to transforming growth factor beta
histone lysine methylation
beta-catenin-TCF complex assembly
transcription, DNA-templated
Posttranslacione modifikacije
GO:0031497, GO:0006336, GO:0034724, GO:0001301, GO:0007580, GO:0034652, GO:0010847 chromatin organization
Izvori:Amigo / QuickGO
Ortolozi
VrsteČovjekMiš
Entrez
Ensembl
UniProt
RefSeq (mRNK)
NM_000244
NM_130799
NM_130800
NM_130801
NM_130802

NM_130803
NM_130804
NM_001370251
NM_001370259
NM_001370260
NM_001370261
NM_001370262
NM_001370263

NM_001168488
NM_001168489
NM_001168490
NM_008583

RefSeq (bjelančevina)
NP_000235
NP_570711
NP_570712
NP_570713
NP_570714

NP_570715
NP_570716
NP_001357180
NP_001357188
NP_001357189
NP_001357190
NP_001357191
NP_001357192

NP_001161960
NP_001161961
NP_001161962
NP_032609

Lokacija (UCSC)Chr 11: 64.8 – 64.81 MbChr 19: 6.39 – 6.39 Mb
PubMed pretraga[3][4]
Wikipodaci
Pogledaj/uredi – čovjekPogledaj/uredi – miš

Studije in vitro pokazale su da je menin lokaliziran u jedru, posjeduje dva funkcionalna jedarna signala lokalizacije i inhibira transkripcijsku aktivaciju do JunD. Međutim, funkcija ovog proteina nije poznata. Dvije iRNK su otkrivene Northern blotovma, ali veća nije okarakterizirana. Identifikovane su dvije varijante kraćeg transkripta gdje alternativna prerada utiče na sekvencu kodiranja. Identificirano je i pet varijanti gdje se alternativna prerada odvija u 5' UTR.[5]

Historija

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Godine 1988. istraživači iz Univerzitetske bolnice Uppsala i Karolinska instituta u Stockholmu mapirali su gen MEN1 na dugom kraku hromosoma 11.[7] Gen je konačno kloniran 1997.[8]

Genomika

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Gen se nalazi na dugom kraku hromosoma 11 (11q13) između parova baza 64,570,985 i 64,578,765. Ima 10 egzona i kodira protein 610 aminokiselina.

Do 2010. prijavljeno je preko 1.300 mutacija. Predviđeno je da ih većina (> 70%) dovodi do skraćenih oblika raspršenih po genu. Četiri-c.249_252delGTCT (delecija na kodonima 83-84), c.1546_1547insC (insercija na kodonu 516), c.1378C> T (Arg460Ter) i c.628_631delACAG (delecija na kodonima 210-211) prijavljeno je u 4,5%, 2,7%, 2,6% i 2,5% porodica.[6]

Aminokiselinska sekvenca

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Dužina polipeptidnog lanca je 615 aminokiselina, a molekulska težina 68.023 Da.[9]

1020304050
MGLKAAQKTLFPLRSIDDVVRLFAAELGREEPDLVLLSLVLGFVEHFLAV
NRVIPTNVPELTFQPSPAPDPPGGLTYFPVADLSIIAALYARFTAQIRGA
VDLSLYPREGGVSSRELVKKVSDVIWNSLSRSYFKDRAHIQSLFSFITGW
SPVGTKLDSSGVAFAVVGACQALGLRDVHLALSEDHAWVVFGPNGEQTAE
VTWHGKGNEDRRGQTVNAGVAERSWLYLKGSYMRCDRKMEVAFMVCAINP
SIDLHTDSLELLQLQQKLLWLLYDLGHLERYPMALGNLADLEELEPTPGR
PDPLTLYHKGIASAKTYYRDEHIYPYMYLAGYHCRNRNVREALQAWADTA
TVIQDYNYCREDEEIYKEFFEVANDVIPNLLKEAASLLEAGEERPGEQSQ
GTQSQGSALQDPECFAHLLRFYDGICKWEEGSPTPVLHVGWATFLVQSLG
RFEGQVRQKVRIVSREAEAAEAEEPWGEEAREGRRRGPRRESKPEEPPPP
KKPALDKGLGTGQGAVSGPPRKPPGTVAGTARGPEGGSTAQVPAPTASPP
PEGPVLTFQSEKMKGMKELLVATKINSSAIKLQLTAQSQVQMKKQKVSTP
SDYTLSFLKRQRKGL

Kliničke implikacije

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Fenotip MEN1 nasljeđuje se autosomno dominantnim obrascem i povezan je s neoplazmama hipofize, paratireoidne žlijezde i gušterače (3 "P"). Iako su ove neoplazije često dobroćudne (za razliku od tumora koji se javljaju u MEN2A), one su adenomi i stoga proizvode endokrine fenotipove. Pankreasna prezentacija fenotipa MEN1 može se manifestovati kao Zollinger-Ellisonov sindrom.

MEN1 tumori hipofize su adenomi prednjih ćelija, tipski prolaktinomi ili lučeći hormon rasta. Tumori gušterače uključuju ćelije otočića, uzrokujući gastrinom ili insulinom. U rijetkim slučajevima javljaju se i tumori kore nadbubrežne žlijezde.

Većina mutacija zametnih linija ili somatska mutacija u MEN1 genu predviđaju skraćivanje ili odsutnost kodiranog menina, što dovodi do nemogućnosti MEN1 da djeluje kao gen supresije tumora.[10] Takve mutacije u MEN1 povezane su s neispravnim vezivanjem kodiranog menina za proteine uključene u genetičke i epigenetičke mehanizme.[11] Menin je protein 621 aminokiseline povezan s insulinomima [12] koji djeluje kao adapter, a istovremeno stupa u interakciju s partnerskim proteinima uključenim u vitalne ćelijske aktivnosti, poput transkripcijske regulacije, diobe ćelija, ćelijske proliferacije i stabilnosti genoma. Insulinomi su neuroendokrini tumori gušterače sa navodnom učestalošću od 0,4 %, koji su obično benigni usamljeni tumori, ali 5-12 % slučajeva ima udaljene metastaze pri postavljanju dijagnoze.[13] Ovi porodični MEN-1 i sporadični tumori mogu nastati ili zbog gubitka heterozigotnosti ili regije q13 hromosoma 11, gdje se nalazi MEN1, ili zbog mutacija u genu.[14][15]

MEN1 mutacije se uglavnom sastoje od delecija ili insercija pomaka okvira, praćenih nonsens mutacijama, mutacija na mjestu prerade) i djelimičnim ili potpunim delecijama gena što dovodi do patoloških stanja.[16] Okvirne i nonsens mutacije rezultiraju navodno neaktivnim i krnjim proteinom menina, dok mutacije na mjestu prerade rezultiraju pogrešno prerađenom iRNK. Misens mutacije MEN1 su posebno važne jer rezultiraju promjenom ključnih aminokiselina potrebnih za vezivanje i interakciju s drugim proteinima i molekulama. Kako se menin nalazi pretežno u jedru,[17] ove mutacije mogu uticati na stabilnost ćelije i mogu dalje na funkcionalnu aktivnost ili nivoe ekspresije proteina. Studije su također pokazale da pojedinačne promjene aminokiselina u genima uključenim u onkogene poremećaje mogu rezultirati proteolitskom razgradnjom koja dovodi do gubitka funkcije i smanjene stabilnosti mutiranog proteina; uobičajeni mehanizam za inaktivaciju produkata gena za suzbijanje tumora.[18][19] Mutacije i delecije gena MEN1 također imaju ulogu u razvoju nasljednih i podgrupe sporadičnih adenoma hipofize i otkrivene su u približno 5% takvih adenoma.[20] Shodno tome, promjene gena predstavljaju potencijalni patogenetski mehanizam tumorigeneze hipofize, posebno ako se posmatraju u smislu interakcija s drugim proteinima, faktorima rasta, onkogeni se ponašaju po pravilu u tumorigenezi.

Iako tačna funkcija MEN1 nije poznata, Knudsonova hipoteza "dva pogotka" pruža jake dokaze da se radi o genu supresije tumora. Porodični gubitak jedne kopije MEN1 viđen je u povezanosti sa MEN-1 sindromom. Tumor suppresorki gen slijedi karcinogeneza Knudsonov model "dva pogotka".[21] Prvi pogodak je heterozigotna mutacija zametne linije MEN1 ili razvijena u ranoj embrionskoj fazi i posljedično prisutna u svim ćelijama pri rođenju za sporadične slučajeve, ili naslijeđena od jednog roditelja u porodičnom slučaju. Drugi pogodak je somatska mutacija MEN1, koja često dolazi od velike delecije u predisponiranoj endokrinoj ćeliji i osigurava im povoljno preživljavanje potrebno za razvoj tumora.[22] MEN-1 sindrom često pokazuje tumore paratireoidnih žlijezda, prednjeg režnja hipofize, endokrinog dijela gušterače i endokrinog dijela duodenuma. Manje često se primjećuju neuroendokrini tumori pluća, timusa i želuca ili neendokrini tumori poput lipoma, angiofibroma i ependimoma.[23]

U istraživanju 12 sporadičnih karcinoidnih tumora pluća, pet slučajeva uključivalo je inaktivaciju obje kopije gena MEN1. Od pet karcinoida, tri su bila atipska, a dva tipska. Dva tipska karcinoida karakterizirala je brza proliferativna stopa s većom mitotskim indeksom i jačom Ki67 pozitivnošću od ostalih tipskih karcinoida u studiji. Shodno tome, smatralo se da su karcinoidni tumori s inaktivacijom gena MEN1 karakterizirani agresivnijim molekulskim i histopatološkim obilježjima od onih bez promjena gena MEN1.[24]

Interakcije

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Dokazano je da MEN1 ima interakcije sa:

Reference

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  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000024947 - Ensembl, maj 2017
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  18. ^ Agarwal SK, Guru SC, Heppner C, Erdos MR, Collins RM, Park SY, Saggar S, Chandrasekharappa SC, Collins FS, Spiegel AM, Marx SJ, Burns AL (januar 1999). "Menin interacts with the AP1 transcription factor JunD and represses JunD-activated transcription". Cell. 96 (1): 143–52. doi:10.1016/s0092-8674(00)80967-8. PMID 9989505. S2CID 18116746.
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Dopunska literatura

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Vanjski linkovi

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