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UDP-グルクロン酸転移酵素1A1遺伝子の変異状態と酵素活性が新生児高ビリルビン血症に及ぼす影響
Effects of variation status and enzyme activity for UDP-glucuronosyltransferase 1A1 gene on neonatal hyperbilirubinemia.
PMID: 32571672 DOI: 10.1016/j.pedneo.2020.05.009.
抄録
背景にあるもの:
酵素活性が正常値の40%以下のUDP-glucuronosyltransferase(UGT)1A1の遺伝子型を持つ台湾人成人はギルバート症候群の発症リスクが高いことを明らかにした。しかし、台湾人の場合、新生児高ビリルビン血症とUGT1A1活性との関係は評価されたことがない。
BACKGROUND: We found that Taiwanese adults carrying genotypes of UDP-glucuronosyltransferase (UGT) 1A1 with enzyme activity ≤40% of normal were at high risk for developing Gilbert's syndrome. However, the relationship between UGT1A1 activity and neonatal hyperbilirubinemia has never been evaluated for Taiwanese.
方法:
部分的に乳児用補助粉ミルクを与えられた高ビリルビン血症新生児141例と対照432例、母乳のみを与えられた高ビリルビン血症新生児112例と対照493例を登録した。UGT1A1遺伝子のヌクレオチド-53、211、686、1091および1456における5つの一塩基多型(SNP)を決定し、UGT1A1活性を推定した。新生児高ビリルビン血症の発症におけるUGT1A1遺伝子の変異状態と酵素活性のオッズ比(OR)をそれぞれ算出した。
METHODS: We enrolled 141 hyperbilirubinemic neonates partially fed supplementary infant formula and 432 controls; and 112 hyperbilirubinemic neonates exclusively breastfed and 493 controls. The five single nucleotide polymorphisms (SNPs) at nucleotides -53, 211, 686, 1091 and 1456 in the UGT1A1 gene were determined and UGT1A1 activity was estimated. Odds ratios (ORs) of variation status in the UGT1A1 gene and enzyme activity for the development of neonatal hyperbilirubinemia were calculated, respectively.
結果:
部分的に補助粉ミルクを与えられた新生児において、高ビリルビン血症の発症に関する調整後OR(AOR)は、UGT1A1遺伝子のホモ接合体変異(211AA)を有する新生児の方が、野生型を有する新生児よりも有意に高かった(AOR=6.00、p<0.001)。UGT1A1活性が正常値の31~40%にランクされた者のAORのみが統計的に有意であった(AOR=3.16、p<0.001)。高ビリルビン血症の新生児では、高ビリルビン血症発症のAORは変動の程度に正の相関があり(AOR=1.95、2.19、4.53;それぞれp=0.003、0.05、<0.001)、UGT1A1酵素活性の影響は変動があった(AOR=1.02〜3.72;p=0.95〜<0.001)。
RESULTS: For neonates partially fed supplementary infant formula, the adjusted OR (AOR) for the development of hyperbilirubinemia was significantly higher in the neonates carrying the homozygous variation (211AA) in the UGT1A1 gene than for those carrying the wild type (AOR = 6.00, p < 0.001). Only the AOR of those carrying UGT1A1 activity ranked 31-40% of normal was statistically significant (AOR = 3.16, p < 0.001). For the hyperbilirubinemic neonates exclusively breastfed, AOR for the development of hyperbilirubinemia is positively correlated to degree of variation (AOR = 1.95, 2.19 and 4.53; with p = 0.003, 0.05 and < 0.001, respectively), while the effect of UGT1A1 enzyme activity was varied (AOR = 1.02-3.72, with p = 0.95∼<0.001).
結論:
UGT1A1遺伝子のSNP(遺伝子型)の組み合わせによる酵素活性の推定値は、新生児高ビリルビン血症の発症を説明するためには利用できなかった。我々は、-53A(TA)TAA/A(TA)TAAではなく、211AAが台湾人の新生児高ビリルビン血症発症の危険因子であることを再確認した。
CONCLUSION: The estimated enzyme activity depending on combination of SNPs (genotypes) in the UGT1A1 gene could not be utilized to explain the development of neonatal hyperbilirubinemia. We reconfirm that the -53 A(TA)TAA/A(TA)TAA is not, while the 211AA is a risk factor for the development of neonatal hyperbilirubinemia in Taiwanese.
Copyright © 2020. Published by Elsevier B.V.