Abstract
Background
Genome-wide association studies have revealed several single-nucleotide polymorphisms around interleukin 28B (IL28B) that are strongly associated with hepatitis C virus (HCV) clearance. However, their predictive value is not perfect, which suggests that other genetic factors may also be involved in HCV clearance. We previously reported a wide variation in the length of a thymine–adenine (TA) dinucleotide repeat in the promoter region of IL28B and that the transcriptional activity of the promoter increased gradually in a TA repeat length-dependent manner.
Methods
We determined the length of the TA repeats of 1,060 Japanese and 201 African-American samples to investigate the relation to spontaneous HCV clearance.
Results
The distribution of the TA repeats greatly differed between the two ethnicities. The variation ranged from 10 to 18 repeats, and the most frequent allele, 12, accounted for over 80 % for Japanese. The African-American data showed a gently sloping distribution, and the allele with six repeats was detected only in the African-American sample. The TA repeats 11 or greater were correlated with spontaneous clearance. Multiple logistic regression analysis extracted the genotype of the TA repeats as an independent factor in both the Japanese [p = 0.0004, odds ratio (OR) = 13.02 95 % confidence interval (CI) = 2.59–237.0] and African-American (p = 0.027, OR = 3.70 95 % CI = 1.16–11.8) populations.
Conclusions
A long TA repeat in the promoter region of IL28B was associated with spontaneous HCV clearance. Although its efficacy may be limited in Japanese population because of its allele distribution, this novel genetic factor will be useful for predicting HCV clearance especially for the African Americans.
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Abbreviations
- IFN:
-
Interferon
- IL28B:
-
Interleukin 28B
- HCV:
-
Hepatitis C virus
- NPV:
-
Negative predictive value
- PEG:
-
Pegylated
- PPV:
-
Positive predictive value
- RBV:
-
Ribavirin
- SNP:
-
Single-nucleotide polymorphism
- UGT:
-
Uridine diphosphoglucuronosyl transferase
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Acknowledgments
This work was supported by grants from the National Center for Global Health and Medicine of Japan (22-108, 25-202), from the Japanese Ministry of Health, Labor and Welfare (H23-007), and from the Japanese Ministry of Education, Culture, Sports, and Science (No. 22590750). We are also grateful to all the technical staffs of Department of Hepatic Diseases, The Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine for their excellent lab works on genotyping the SNPs of IL28B and TA repeat.
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The authors declare that they have no conflict of interest.
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S. Hiramine and M. Sugiyama contributed equally to this work.
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Hiramine, S., Sugiyama, M., Furusyo, N. et al. A thymine–adenine dinucleotide repeat polymorphism near IL28B is associated with spontaneous clearance of hepatitis C virus. J Gastroenterol 50, 1069–1077 (2015). https://doi.org/10.1007/s00535-015-1056-1
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DOI: https://doi.org/10.1007/s00535-015-1056-1