Paula M Hertel1, Laura N Bull2, Richard J Thompson3, Nathan P Goodrich4, Wen Ye5, John C Magee5, Robert H Squires6, Lee M Bass7, James E Heubi8, Grace E Kim2, Sarangarajan Ranganathan8, Kathleen B Schwarz9, Molly A Bozic10, Simon P Horslen11, Matthew S Clifton12, Yumirle P Turmelle13, Frederick J Suchy14, Riccardo A Superina7, Kasper S Wang15, Kathleen M Loomes16, Binita M Kamath17, Ronald J Sokol14, Benjamin L Shneider1. 1. Texas Children's Hospital, Baylor College of Medicine, Houston, TX. 2. University of California, San Francisco, San Francisco, CA. 3. King's College London, London, UK. 4. Arbor Research Collaborative for Health. 5. University of Michigan Hospitals and Health Centers, Ann Arbor, MI. 6. UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA. 7. Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL. 8. Cincinnati Children's Hospital Medical Center, Cincinnati, OH. 9. Johns Hopkins Medicine, Baltimore, MD. 10. Indiana University-Riley Hospital for Children, Indianapolis, IN. 11. Seattle Children's Hospital, Seattle, WA. 12. Emory University School of Medicine, Atlanta, GA. 13. Washington University, St. Louis Children's Hospital, St. Louis, MO. 14. University of Colorado School of Medicine, Children's Hospital Colorado, Aurora, CO. 15. Children's Hospital Los Angeles, University of Southern California, Los Angeles, CA. 16. The Children's Hospital of Philadelphia, Philadelphia, PA. 17. Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.
Abstract
OBJECTIVES: To advance our understanding of monogenic forms of intrahepatic cholestasis. METHODS: Analyses included participants with pathogenic biallelic mutations in adenosine triphosphate (ATP)-binding cassette subfamily B member 11 (ABCB11) (bile salt export pump; BSEP) or adenosine triphosphatase (ATPase) phospholipid transporting 8B1 (ATP8B1) (familial intrahepatic cholestasis; FIC1), or those with monoallelic or biallelic mutations in adenosine triphosphate (ATP)-binding cassette subfamily B member 4 (ABCB4) (multidrug resistance; MDR3), prospectively enrolled in the Longitudinal Study of Genetic Causes of Intrahepatic Cholestasis (LOGIC; NCT00571272) between November 2007 and December 2013. Summary statistics were calculated to describe baseline demographics, history, anthropometrics, laboratory values, and mutation data. RESULTS: Ninety-eight participants with FIC1 (n = 26), BSEP (n = 53, including 8 with biallelic truncating mutations [severe] and 10 with p.E297G or p.D482G [mild]), or MDR3 (n = 19, including four monoallelic) deficiency were analyzed. Thirty-five had a surgical interruption of the enterohepatic circulation (sEHC), including 10 who underwent liver transplant (LT) after sEHC. Onset of symptoms occurred by age 2 years in most with FIC1 and BSEP deficiency, but was later and more variable for MDR3. Pruritus was nearly universal in FIC1 and BSEP deficiency. In participants with native liver, failure to thrive was common in FIC1 deficiency, high ALT was common in BSEP deficiency, and thrombocytopenia was common in MDR3 deficiency. sEHC was successful after more than 1 year in 7 of 19 participants with FIC1 and BSEP deficiency. History of LT was most common in BSEP deficiency. Of 102 mutations identified, 43 were not previously reported. CONCLUSIONS: In this cohort, BSEP deficiency appears to be correlated with a more severe disease course. Genotype-phenotype correlations in these diseases are not straightforward and will require the study of larger cohorts.
OBJECTIVES: To advance our understanding of monogenic forms of intrahepatic cholestasis. METHODS: Analyses included participants with pathogenic biallelic mutations in adenosine triphosphate (ATP)-binding cassette subfamily B member 11 (ABCB11) (bile salt export pump; BSEP) or adenosine triphosphatase (ATPase) phospholipid transporting 8B1 (ATP8B1) (familial intrahepatic cholestasis; FIC1), or those with monoallelic or biallelic mutations in adenosine triphosphate (ATP)-binding cassette subfamily B member 4 (ABCB4) (multidrug resistance; MDR3), prospectively enrolled in the Longitudinal Study of Genetic Causes of Intrahepatic Cholestasis (LOGIC; NCT00571272) between November 2007 and December 2013. Summary statistics were calculated to describe baseline demographics, history, anthropometrics, laboratory values, and mutation data. RESULTS: Ninety-eight participants with FIC1 (n = 26), BSEP (n = 53, including 8 with biallelic truncating mutations [severe] and 10 with p.E297G or p.D482G [mild]), or MDR3 (n = 19, including four monoallelic) deficiency were analyzed. Thirty-five had a surgical interruption of the enterohepatic circulation (sEHC), including 10 who underwent liver transplant (LT) after sEHC. Onset of symptoms occurred by age 2 years in most with FIC1 and BSEP deficiency, but was later and more variable for MDR3. Pruritus was nearly universal in FIC1 and BSEP deficiency. In participants with native liver, failure to thrive was common in FIC1 deficiency, high ALT was common in BSEP deficiency, and thrombocytopenia was common in MDR3 deficiency. sEHC was successful after more than 1 year in 7 of 19 participants with FIC1 and BSEP deficiency. History of LT was most common in BSEP deficiency. Of 102 mutations identified, 43 were not previously reported. CONCLUSIONS: In this cohort, BSEP deficiency appears to be correlated with a more severe disease course. Genotype-phenotype correlations in these diseases are not straightforward and will require the study of larger cohorts.
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