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Keratin variants predispose to acute liver failure and adverse outcome: race and ethnic associations.

Abstract：

BACKGROUND & AIMS:Keratins 8 and 18 (K8/K18) provide anti-apoptotic functions upon liver injury. The cytoprotective function of keratins explains the overrepresentation of K8/K18 variants in patients with cirrhosis. However, K8/K18 variant-associated susceptibility to acute liver injury, which is well-described in animal models, has not been studied in humans. METHODS:We analyzed the entire coding regions of KRT8 and KRT18 genes (15 total exons and their exon-intron boundaries) to determine the frequency of K8/K18 variants in 344 acute liver failure (ALF) patients (49% acetaminophen-related) and 2 control groups (African-American [n = 245] and previously analyzed white [n = 727] subjects). RESULTS:Forty-five ALF patients had significant amino-acid-altering K8/K18 variants, including 23 with K8 R341H and 11 with K8 G434S. K8 variants were significantly more common (total of 42 patients) than K18 variants (3 patients) (P < .001). We found increased frequency of variants in white ALF patients (9.1%) versus controls (3.7%) (P = .01). K8 R341H was more common in white (P = .01) and G434S was more common in African-American (P = .02) ALF patients versus controls. White patients with K8/K18 variants were less likely to survive ALF without transplantation (P = .02). K8 A333A and G434S variants associated exclusively with African Americans (23% combined frequency in African American but none in white controls; P < .0001), while overall, K18 variants were more common in non-white liver-disease subjects compared to whites (2.8% vs 0.6%, respectively; P = .008). CONCLUSIONS:KRT8 and KRT18 are important susceptibility genes for ALF development. Presence of K8/K18 variants predisposes to adverse ALF outcome, and some variants segregate with unique ethnic and race backgrounds.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Strnad P,Zhou Q,Hanada S,Lazzeroni LC,Zhong BH,So P,Davern TJ,Lee WM,Acute Liver Failure Study Group.,Omary MB

doi

10.1053/j.gastro.2010.06.007

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

828-35, 835.e1-3

issue

3

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(10)00860-7

journal_volume

139

pub_type

杂志文章,多中心研究

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