DTDST
Sulfatni transporter, član porodice rastvornih nosača, jest protein koji je kod ljudi kodiran genom SLC26A2.[5] SLC26A2 se naziva i transporter sulfata (DTDST) dijastrofijske displazije, a prvi su ga opisali Hästbacka et sl. u 1994.[5] Ovaj transporter sulfata (SO42–) kao podloge također prihvata hlorid, hidroksilne ione (OH–) i oksalat.[6][7] SLC26A2 se eksprimira u visokim nivoima u razvoju i zrelim hrskavicama, kao i u plućima, posteljici, debelom crijevu, bubrezima, gušterači i sjemenicima.[8][9]
Aminokiselinska sekvenca
urediDužina polipeptidnog lanca je 739 aminokiselina, а molekulska težina 81.662 Da.[10]
10 | 20 | 30 | 40 | 50 | ||||
---|---|---|---|---|---|---|---|---|
MSSESKEQHN | VSPRDSAEGN | DSYPSGIHLE | LQRESSTDFK | QFETNDQCRP | ||||
YHRILIERQE | KSDTNFKEFV | IKKLQKNCQC | SPAKAKNMIL | GFLPVLQWLP | ||||
KYDLKKNILG | DVMSGLIVGI | LLVPQSIAYS | LLAGQEPVYG | LYTSFFASII | ||||
YFLLGTSRHI | SVGIFGVLCL | MIGETVDREL | QKAGYDNAHS | APSLGMVSNG | ||||
STLLNHTSDR | ICDKSCYAIM | VGSTVTFIAG | VYQVAMGFFQ | VGFVSVYLSD | ||||
ALLSGFVTGA | SFTILTSQAK | YLLGLNLPRT | NGVGSLITTW | IHVFRNIHKT | ||||
NLCDLITSLL | CLLVLLPTKE | LNEHFKSKLK | APIPIELVVV | VAATLASHFG | ||||
KLHENYNSSI | AGHIPTGFMP | PKVPEWNLIP | SVAVDAIAIS | IIGFAITVSL | ||||
SEMFAKKHGY | TVKANQEMYA | IGFCNIIPSF | FHCFTTSAAL | AKTLVKESTG | ||||
CHTQLSGVVT | ALVLLLVLLV | IAPLFYSLQK | SVLGVITIVN | LRGALRKFRD | ||||
LPKMWSISRM | DTVIWFVTML | SSALLSTEIG | LLVGVCFSIF | CVILRTQKPK | ||||
SSLLGLVEES | EVFESVSAYK | NLQIKPGIKI | FRFVAPLYYI | NKECFKSALY | ||||
KQTVNPILIK | VAWKKAAKRK | IKEKVVTLGG | IQDEMSVQLS | HDPLELHTIV | ||||
IDCSAIQFLD | TAGIHTLKEV | RRDYEAIGIQ | VLLAQCNPTV | RDSLTNGEYC | ||||
KKEEENLLFY | SVYEAMAFAE | VSKNQKGVCV | PNGLSLSSD |
Funkcija
urediSulfatni transporter distrodfijske displazije je transmembranski glikoprotein uključen u patogenezu nekoliko ljudskih hondrodisplazija. U hondrocitima SLC26A2 funkcionira tako kao transportr većine ćelijskog sulfata, koji je kritičan za sulfatizaciju proteoglikana i normalno stvaranje hrskavice.[11] Osim toga, studije su pokazale da SLC26A2 utiče na proliferaciju, diferencijaciju i rast hondrocita, sugerirajući da u hondrocitu SLC26A2 daje sulfat i za strukturne i za regulatorne proteine.[12]
Klinički značaj
urediNedostaci su povezani s mnogim oblicima osteohondrodisplazija.[9] These include:
- ahondrogeneza tip 1B
- dijastrofijska displazija
- atelosteogeneza, tip II
- recesivna multipla epifizna displazija
Korelacija između genotipa i fenotipa
urediOd njegovog prvog opisa, poznato je preko 30 mutacija u genu SLC26A2 u četiri gore recesivno naslijedive hondrodisplazije. Ahondrogeneza 1B (ACG-1B) je najteži oblik ovih hondrodisplazija, što rezultira nerazvijenošću skeleta i smrću prije ili neposredno nakon rođenja.[13] Atelosteogeneza tipa II (AO-II) može biti smrtonosna u neonatusnom periodu,[14] budući da se dijastrofijska displazija (DTD) i autosomno recesivna multipla epifizna displazija (EDM4/rMED) smatraju najtežim oblicima.
Kada je deset prethodno opisanih mutacija SLC26A2 eksprimirano u ćelijama sisara, pronađena je snažna korelacija između količine transportne aktivnosti sulfata mutiranog proteina i težine fenotipa kod pacijenata kod kojih su te mutacije identificirane.[15] Naprimjer, mutacija koja rezultira nefunkcionalnim proteinom na oba alela uvijek je pronađena s teškim fenotipom ACG-IB, ali nefunkcionalne mutacije na oba nikada nisu pronađene s manje teškim fenotipima, DTD i rMED. Mutacije pronađene u umjereno teškom fenotipu AO-II uvijek su bile rezultat nefunkcionalne mutacije na jednom alelu i djelomično funkcionalne mutacije na suprotnom alelu. Nasuprot tome, mutacije opisane u najblažem obliku hondrodisplazije, rMED, rezultiraju proteinima koji zadržavaju barem dio djelimične transportne funkcije sulfata na oba alela. To sugerira da čak i mala količina transporta sulfata posredovanog SLC26A2 u hondrocitima može ublažiti kliničku težinu hondrodisplazije. Međutim, pronađena je manje predvidljiva korelacija genotip/fenotip s mutacijom opisanom pretežno u finskoj populaciji. Ova finska mutacija nalazi se na mjestu prerade gena i rezultira niskim nivoom iRNK SLC26A2-a.[16] Različiti nivoi ekspresije proteina SLC26A2 vjerovatno su uzrok varijabilnih fenotipova opisanih sa ovom mutacijom.
Funkcionalni značaj SLC26A2 u debelom crijevu i bubregu
urediImunohistohemijska analiza lokalizirala je SLC26A2 na apikalnoj membrani epitelnih ćelijaa debelog crijeva i ćelijama proksimalnih bubrežnih tubula.[6][17]
Debelo crijevo
urediObilni nivoi iRNK SLC26A2-a identificirani su u tankom i debelom crijevu miševa, pacovaa i ljudi. U ljudskom crijevu SLC26A2 prisutan je u gornjoj trećini kripti, gdje je usmjeren prema apikalnoj membrani.[18] Fiziološku ulogu SLC26A2 u ljudskom crijevu tek treba utvrditi, ali on vjerovatno predstavlja izmjenjivač sulfata/oksalata koji je okarakteriziran u preparatima vezikula apikalne membrane debelog crijeva i vjerovatno ima važnu ulogu u transportu sulfata u ovom tkivu.[19] Zapravo, sugerirano je da se poremećajna sulfacija javlja tokom maligne transformacije epitelnih ćelija debelog crijeva, a studije su pokazale da je stopa rasta ćelija raka značajno povećana kada je transkripcija SLC26A2 potisnuta.[20]
Bubrezi
urediProtein SLC26A2 je lokaliziran na graničnoj membrani proksimalnih tubula pacovskih bubrega.[17] Na tom mjestu izmjenjuje oksalat/SO42– ili klorid/SO42–, pomoću SLC26A2 može doprinijeti kritičnom procesu reapsorpcije natrij-hlorida preko epitela proksimalnih tubula. Prema jednom predloženom modelu, anionski transporter razmjenjuje unutarćelijslki oksalat za lumens000ki hlorid, paralelno s kotransporterom Na–SO4, što rezultira neto resorpcijom natrij-hlorida.[21] Prema ovom modelu, potreban je treći transportni proces koji funkcionira kao nsčin recikliranja oksalata natrag u ćeliju i recikliranja sulfata iz ćelije u lumen. Ranije se smatralo da je SLC26A6, drugi član iste porodice anionskih transportera kao i DTDST, pruža mehanizam transporta hlorida posredovanog oksalatima ili formatom u ovom segmentu nefrona; međutim, nedavne studije na nokaut-miševima Slc26a6 postavile su pitanja o njegovoj ulozi u ovom transportnom procesu.[22] Nasuprot tome, položaj apikalne membrane i elektrohemijska svojstva SLC26A2 odgovarali bi zahtjevu anionskog izmjenjivača smještenog na apikalnoj membrani proksimalnih tubula, koji bi služio kao mehanizam transporta hlorida u zamjenu za oksalat i/ili recikliranje oksalata u zamena za sulfat.
Reference
uredi- ^ a b c GRCh38: Ensembl release 89: ENSG00000155850 - Ensembl, maj 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000034320 - Ensembl, maj 2017
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- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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- ^ Ohana E, Shcheynikov N, Park M, Muallem S (februar 2012). "Solute carrier family 26 member a2 (Slc26a2) protein functions as an electroneutral SOFormula/OH-/Cl- exchanger regulated by extracellular Cl-". The Journal of Biological Chemistry. 287 (7): 5122–32. doi:10.1074/jbc.M111.297192. PMC 3281620. PMID 22190686.
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- Lohi H, Kujala M, Makela S, Lehtonen E, Kestila M, Saarialho-Kere U, Markovich D, Kere J (april 2002). "Functional characterization of three novel tissue-specific anion exchangers SLC26A7, -A8, and -A9". The Journal of Biological Chemistry. 277 (16): 14246–54. doi:10.1074/jbc.M111802200. PMID 11834742.
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- Huang QY, Li GH, Kung AW (august 2009). "The -9247 T/C polymorphism in the SOST upstream regulatory region that potentially affects C/EBPalpha and FOXA1 binding is associated with osteoporosis". Bone. 45 (2): 289–94. doi:10.1016/j.bone.2009.03.676. PMID 19371798.
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Vanjski linkovi
uredi- SLC26A2 protein, human na US National Library of Medicine Medical Subject Headings (MeSH)
Ovaj članak uključuje tekst iz Nacionalne medicinske biblioteke Sjedinjenih Država, koji je u javnom vlasništvu.