ABCB11 p.Tyr472*
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p.Tyr472Cys
D
p.Tyr472* D |
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[hide] Hepatocellular carcinoma in ten children under fiv... Hepatology. 2006 Aug;44(2):478-86. Knisely AS, Strautnieks SS, Meier Y, Stieger B, Byrne JA, Portmann BC, Bull LN, Pawlikowska L, Bilezikci B, Ozcay F, Laszlo A, Tiszlavicz L, Moore L, Raftos J, Arnell H, Fischler B, Nemeth A, Papadogiannakis N, Cielecka-Kuszyk J, Jankowska I, Pawlowska J, Melin-Aldana H, Emerick KM, Whitington PF, Mieli-Vergani G, Thompson RJ
Hepatocellular carcinoma in ten children under five years of age with bile salt export pump deficiency.
Hepatology. 2006 Aug;44(2):478-86., [PMID:16871584]
Abstract [show]
Hepatocellular carcinoma (HCC) is rare in young children. We attempted to see if immunohistochemical and mutational-analysis studies could demonstrate that deficiency of the canalicular bile acid transporter bile salt export pump (BSEP) and mutation in ABCB11, encoding BSEP, underlay progressive familial intrahepatic cholestasis (PFIC)--or "neonatal hepatitis" suggesting PFIC--that was associated with HCC in young children. We studied 11 cases of pediatric HCC in the setting of PFIC or "neonatal hepatitis" suggesting PFIC. Archival liver were retrieved and immunostained for BSEP. Mutational analysis of ABCB11 was performed in leukocyte DNA from available patients and parents. Among the 11 nonrelated children studied aged 13-52 months at diagnosis of HCC, 9 (and a full sibling, with neonatal hepatitis suggesting PFIC, of a tenth from whom liver was not available) had immunohistochemical evidence of BSEP deficiency; the eleventh child did not. Mutations in ABCB11 were demonstrated in all patients with BSEP deficiency in whom leukocyte DNA could be studied (n = 7). These mutations were confirmed in the parents (n = 14). With respect to the other 3 children with BSEP deficiency, mutations in ABCB11 were demonstrated in all 5 parents in whom leukocyte DNA could be studied. Thirteen different mutations were found. In conclusion, PFIC associated with BSEP deficiency represents a previously unrecognized risk for HCC in young children. Immunohistochemical evidence of BSEP deficiency correlates well with demonstrable mutation in ABCB11.
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No. Sentence Comment
66 Patients, Clinical Courses, and ABCB11 / BSEP Mutations Patient/Gender; Origins Sibling(s) With PFIC Age, PFIC Manifest Intervention(s) Age, HCC Diagnosed Outcome to Date Nucleotide Changes Predicted Consequences A/Male; Northern European Caucasian 0 Cholestasis from 3 wk Hepatocyte infusion, 16 mo 21 mo (incidental in explant; AFP 199, nl Ͻ 7), at LT Healthy (2 y, 8 mo after LT) 1939delA/IVS16-8TϾG (compound heterozygote) 647K then VFTSLX/ splice site disruption B/Female; Northern European Caucasian 0 Cholestasis from 2 wk, hospitalized for evaluation aged 12 wk None 28 mo, at open biopsy; AFP not determined Palliative care only; death aged 33 mo IVS18ϩ1GϾA/74CϾA (compound heterozygote) Splice site disruption/ S25X C/Male; Northern European Caucasian 0 Cholestasis from birth None 23 mo (AFP 30k, nl Ͻ 5; liver mass); histologic diagnosis at necropsy, 24 mo Palliative care only; death aged 24 mo 1445AϾG/3691CϾT (compound heterozygote) D482G/R1231W D/Male; Northern European Caucasian 1 Cholestasis from 3 wk Partial external biliary diversion (PEBD), 11 mo; decreased pruritus temporarily, clinical-laboratory test results and growth no better 22 mo (AFP 158k, nl Ͻ 15); liver mass; lung and bone lesions; chemotherapy given; histologic diagnosis at LT, 25 mo Death, 6 d after LT (sepsis; no HCC at necropsy) 890AϾG/890AϾG (homozygote) E297G/E297G E/Male; Northern European Caucasian 1 Growth failure from 6 mo; diagnosed 9.5 mo PEBD, 10 mo; no response 29 mo (incidental in explant; AFP 6.4k, nl Ͻ 9), at LT Healthy (5 y, 10 mo after LT) IVS7ϩ1GϾA/890AϾG (compound heterozygote) Splice site disruption/ E297G F/Male; Northern European Caucasian 1 Cholestasis from 6 wk None 16 mo (clinically unsuspected), at necropsy; AFP not determined Death with metastatic HCC in lungs IVS9ϩ1GϾT/not known Splice site disruption/ not known G/Female; Arabic 3 Cholestasis from 6 wk None 15 mo (AFP 11k, nl Ͻ 7; liver mass); histologic diagnosis at LT, 16 mo Healthy (1 y, 7 mo after LT) 1416TϾA/1416TϾA (homozygote) Y472X/Y472X H/Male; Northern European Caucasian 0 Evaluation at 6 mo for jaundice and growth failure PEBD, 32 mo; excellent response (pruritus resolved, bile salts in serum normal range, growth resumed) 52 mo (marked increase in abdominal size; tumor metastasized at diagnosis; AFP 2x106, nl Ͻ 9), at open biopsy Palliative care only; death 3 wk after diagnosis 890 AϾG/ IVS13del-13ˆ-8 (compound heterozygote) E297G/splice site disruption I/Male; Central Asian Caucasian 0 Cholestasis from birth None 13 mo (incidental in explant; AFP 831, nl Ͻ 23), at LT Healthy (1 y, 11 mo after LT) IVS19ϩ2TϾC (homozygote) Splice site disruption J/Male; Central Asian Caucasian 0 Cholestasis from 1 wk None 14 mo (AFP 4k, nl Ͻ 23; liver mass), at biopsy; confirmed at LT, 15 mo Healthy (1 y, 2 mo after LT) 2316TϾG (homozygote) Y772X K/Male; Northern European Caucasian 3 Cholestasis from 3 mo None 26 mo (marked increase in abdominal size; tumor metastasized at diagnosis; AFP not measured), at open biopsy Death with metastatic HCC in lungs, aged 27 mo None sought None predicted Fig. 1.
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ABCB11 p.Tyr472* 16871584:66:2136
status: NEWX
ABCB11 p.Tyr472* 16871584:66:2142
status: NEW[hide] Severe bile salt export pump deficiency: 82 differ... Gastroenterology. 2008 Apr;134(4):1203-14. doi: 10.1053/j.gastro.2008.01.038. Epub 2008 Jan 18. Strautnieks SS, Byrne JA, Pawlikowska L, Cebecauerova D, Rayner A, Dutton L, Meier Y, Antoniou A, Stieger B, Arnell H, Ozcay F, Al-Hussaini HF, Bassas AF, Verkade HJ, Fischler B, Nemeth A, Kotalova R, Shneider BL, Cielecka-Kuszyk J, McClean P, Whitington PF, Sokal E, Jirsa M, Wali SH, Jankowska I, Pawlowska J, Mieli-Vergani G, Knisely AS, Bull LN, Thompson RJ
Severe bile salt export pump deficiency: 82 different ABCB11 mutations in 109 families.
Gastroenterology. 2008 Apr;134(4):1203-14. doi: 10.1053/j.gastro.2008.01.038. Epub 2008 Jan 18., [PMID:18395098]
Abstract [show]
BACKGROUND & AIMS: Patients with severe bile salt export pump (BSEP) deficiency present as infants with progressive cholestatic liver disease. We characterized mutations of ABCB11 (encoding BSEP) in such patients and correlated genotypes with residual protein detection and risk of malignancy. METHODS: Patients with intrahepatic cholestasis suggestive of BSEP deficiency were investigated by single-strand conformation polymorphism analysis and sequencing of ABCB11. Genotypes sorted by likely phenotypic severity were correlated with data on BSEP immunohistochemistry and clinical outcome. RESULTS: Eighty-two different mutations (52 novel) were identified in 109 families (9 nonsense mutations, 10 small insertions and deletions, 15 splice-site changes, 3 whole-gene deletions, 45 missense changes). In 7 families, only a single heterozygous mutation was identified despite complete sequence analysis. Thirty-two percent of mutations occurred in >1 family, with E297G and/or D482G present in 58% of European families (52/89). On immunohistochemical analysis (88 patients), 93% had abnormal or absent BSEP staining. Expression varied most for E297G and D482G, with some BSEP detected in 45% of patients (19/42) with these mutations. Hepatocellular carcinoma or cholangiocarcinoma developed in 15% of patients (19/128). Two protein-truncating mutations conferred particular risk; 38% (8/21) of such patients developed malignancy versus 10% (11/107) with potentially less severe genotypes (relative risk, 3.7 [confidence limits, 1.7-8.1; P = .003]). CONCLUSIONS: With this study, >100 ABCB11 mutations are now identified. Immunohistochemically detectable BSEP is typically absent, or much reduced, in severe disease. BSEP deficiency confers risk of hepatobiliary malignancy. Close surveillance of BSEP-deficient patients retaining their native liver, particularly those carrying 2 null mutations, is essential.
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No. Sentence Comment
184 (C) Absent BSEP staining in patient 4, homozygote for ABCB11 mutation yielding Y472X.
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ABCB11 p.Tyr472* 18395098:184:79
status: NEW219 Mutation clusters include Y472C, Y472X,28 and I541L33,54/I541T.
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ABCB11 p.Tyr472* 18395098:219:33
status: NEW[hide] The bile salt export pump (BSEP) in health and dis... Clin Res Hepatol Gastroenterol. 2012 Dec;36(6):536-53. doi: 10.1016/j.clinre.2012.06.006. Epub 2012 Jul 12. Kubitz R, Droge C, Stindt J, Weissenberger K, Haussinger D
The bile salt export pump (BSEP) in health and disease.
Clin Res Hepatol Gastroenterol. 2012 Dec;36(6):536-53. doi: 10.1016/j.clinre.2012.06.006. Epub 2012 Jul 12., [PMID:22795478]
Abstract [show]
The bile salt export pump (BSEP) is the major transporter for the secretion of bile acids from hepatocytes into bile in humans. Mutations of BSEP are associated with cholestatic liver diseases of varying severity including progressive familial intrahepatic cholestasis type 2 (PFIC-2), benign recurrent intrahepatic cholestasis type 2 (BRIC-2) and genetic polymorphisms are linked to intrahepatic cholestasis of pregnancy (ICP) and drug-induced liver injury (DILI). Detailed analysis of these diseases has considerably increased our knowledge about physiology and pathophysiology of bile secretion in humans. This review focuses on expression, localization, and function, short- and long-term regulation of BSEP as well as diseases association and treatment options for BSEP-associated diseases.
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No. Sentence Comment
185 PFIC BRIC/NFC ICP Other liver diseases Genetic variants without disease association Missense mutations M1V C336S D549V L1055P E135K E137K T87R V43I S701P G19R W342G G556R C1083Y E137K L198P M123T S56L L712L L50S A382G G562D A1110E E186G E297G S194P Q121K A865D M62K R387H A570T S1114R L198P R415Q L198P R128H A865G C68Y A390P L581F G1116E E297G V444A G260D I206V S874P C107R G410D A588V G1116F G374S D482G E297K V284A I939M I112T L413W S593R G1116R A390P N591S V444A G295C R958Q W114R I420T I627T S1120N R432T T655I T510T G295R F959C Y157C D440E E636G R1128C V444A T655I G295S F959V A167T G455E R698C S1144R I498T D676Y R299K T965S A167V K461E S699P R1153C A570T P710P R303K F971L I182K T463I E709K R1153H T586I L827I L339V F971Y M183T Q466K G758R S1154P G648V G855R H423R L1006F M183V R470Q G766R N1173D T655I E1186K V444A N1009H G188W Y472C Y818F T1210P T923P V444D K1145N M217R V481E R832C N1211D A926P V444G I1183T R223C D482G R832H V1212F R948C A459V S226L R487H T859R R1231Q G1004D I468I G238V R487P A865V R1231W R1050C R487L T242I N490D Q869P L1242I G1116R Q546K A257G I498T G877R D1243G R1128H Q558H V284L G499E S901R R1268Q L1197G E592Q E297G I512T R948C A1283V R1231Q V597M R303G N515T N979D G1292V R616G R303K R517H G982R G1298R T619A Q312H F540L G1004D M677L R313S I541L T1029K M677V G327E I541T G1032R R696Q W330R F548Y A1044P R698H Nonsense mutations (premature stop-codons) S25X Y472X Y772X R1090X E96X W493X Q791X V1147X W330X R520X R928X Q1215X Y354X I528X Y1041X R1235X R415X R575X R1057X E1302X R470X Q702X Q1058X Table 1 (Continued) PFIC BRIC/NFC ICP Other liver diseases Genetic variants without disease association Splice site mutations 76 + 3G > T 908 + 1delG 2178 + 1G > T 3057-2A > G Q159Q 77-1G > C 908 + 1G > T 2179-2A > G 3213 + 1delG Q361Q 99-1G > T 908 + 1G > A 2343 + 1G > T 3213 + 4A > G 150 + 3A > C 1435-13 -8del 2343 + 2T > C 3213 + 5G > A 390-1G > A 2012-8T > G 2611-2A > T 611 + 1G > A 2178 + 1G > A R1001R Deletions/insertions/frame shifts Q101Dfs8X L380Wfs18X G648Vfs5X Q1058Hfs38X F959Hfs1X T127Hfs6X A382 A388del K700Sfs12X I1061Vfs34X F959Gfs48X N199Ifs14X P456Pfs24X T919del L1165del L232Cfs9X H484Rfs5X K930Efs92X A1192Efs50X R303Sfs17X I528Sfs21X K930Efs79X T1256Tfs40X V368Rfs27X I610Qfs45X K969 K972del Synonymous variants without disease association R33R F90F L232L I416I G557G I876I A1028A K1145K D36D I134I Y269Y G418G V597V G937G K1070K R52R S136S Q312Q F427F A804A Y981Y T1086T D58D V195V G319G E395E A535A G817G G1004G A1110A The overview shows ࣈ 290 known variants of BSEP on the protein level, except splice site mutations, which are shown on cDNA level.
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ABCB11 p.Tyr472* 22795478:185:1394
status: NEW