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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Neonatal Dubin-Johnson syndrome: biochemical parameters, characteristics, and genetic variants study.
Pediatric Research 2022 May
BACKGROUND: The clinical characteristics and gene mutation characteristics of children with Dubin-Johnson syndrome (DJS) need in-depth study.
METHODS: The clinical and genomic data of neonatal Dubin-Johnson syndrome (NDJS) and 155 cases with idiopathic cholestasis (IC) were analyzed from June 2016 to August 2020 RESULTS: ABCC2 gene variants were identified in eight patients, including one patient with homozygous variants and seven patients with compound heterozygous variants. A total of 13 different ABCC variants were detected in the NDJS patients, including three nonsense variants, six missense variants, three frameshift variants, and a splice site variant. The variant c.2443C > T (p.R815X), c.4237_4238insCT (p.H1414Lfs*17), c.960_961insGT (p.L322Cfs*3), c.4250delC (p.S1417Ffs*14), c.2224G > A (p.D742N), c.4020G > C (p.K1340N), and c.2439 + 5G > A were not reported in the Human Gene Variant Database. There was no significance in the sex, birth weight, and onset age between the NDJS and IC groups. Compared with the IC group, the NDJS group had significantly higher levels of total bilirubin (TB), but a significantly lower level of alanine transaminase and a ratio of direct bilirubin (DB) to TB. There is no significance in total bile acid, gamma-glutamyl-transpeptidase, albumin, or international normalized ratio between the two groups.
CONCLUSIONS: NDJS should be considered in prolonged neonatal intrahepatic cholestasis, especially in infants with normal or slightly elevated transaminase levels.
IMPACT: Explore the biochemical parameters, characteristics, and genetic profile of NDJS. By summarizing the characteristics of biochemical indicators, seven new mutation types of the ABCC2 gene were detected, which expanded the mutation spectrum of the ABCC2 gene. NDJS should be considered in prolonged neonatal intrahepatic cholestasis, especially in infants with normal or slightly elevated transaminase levels.
METHODS: The clinical and genomic data of neonatal Dubin-Johnson syndrome (NDJS) and 155 cases with idiopathic cholestasis (IC) were analyzed from June 2016 to August 2020 RESULTS: ABCC2 gene variants were identified in eight patients, including one patient with homozygous variants and seven patients with compound heterozygous variants. A total of 13 different ABCC variants were detected in the NDJS patients, including three nonsense variants, six missense variants, three frameshift variants, and a splice site variant. The variant c.2443C > T (p.R815X), c.4237_4238insCT (p.H1414Lfs*17), c.960_961insGT (p.L322Cfs*3), c.4250delC (p.S1417Ffs*14), c.2224G > A (p.D742N), c.4020G > C (p.K1340N), and c.2439 + 5G > A were not reported in the Human Gene Variant Database. There was no significance in the sex, birth weight, and onset age between the NDJS and IC groups. Compared with the IC group, the NDJS group had significantly higher levels of total bilirubin (TB), but a significantly lower level of alanine transaminase and a ratio of direct bilirubin (DB) to TB. There is no significance in total bile acid, gamma-glutamyl-transpeptidase, albumin, or international normalized ratio between the two groups.
CONCLUSIONS: NDJS should be considered in prolonged neonatal intrahepatic cholestasis, especially in infants with normal or slightly elevated transaminase levels.
IMPACT: Explore the biochemical parameters, characteristics, and genetic profile of NDJS. By summarizing the characteristics of biochemical indicators, seven new mutation types of the ABCC2 gene were detected, which expanded the mutation spectrum of the ABCC2 gene. NDJS should be considered in prolonged neonatal intrahepatic cholestasis, especially in infants with normal or slightly elevated transaminase levels.
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