{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,10]],"date-time":"2026-05-10T07:50:13Z","timestamp":1778399413714,"version":"3.51.4"},"reference-count":57,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2023,7,6]],"date-time":"2023-07-06T00:00:00Z","timestamp":1688601600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"ALBERT GOODSTEIN RESEARCH FUND","award":["2025088"],"award-info":[{"award-number":["2025088"]}]},{"name":"ALBERT GOODSTEIN RESEARCH FUND","award":["Ref. A\/1015451"],"award-info":[{"award-number":["Ref. A\/1015451"]}]},{"name":"Executive Vice President of Research Office, Israel Institute of Technology","award":["2025088"],"award-info":[{"award-number":["2025088"]}]},{"name":"Executive Vice President of Research Office, Israel Institute of Technology","award":["Ref. A\/1015451"],"award-info":[{"award-number":["Ref. A\/1015451"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Children"],"abstract":"<jats:p>Glucose-6-phosphate dehydrogenase (G6PD) deficiency and polymorphism in uridine diphosphate glucuronosyl transferase 1A1 (UGT1A1) were associated with significant neonatal hyperbilirubinemia (NHB) and increased risk for kernicterus. However, quantitative screening tests for G6PD enzyme activity proved unsatisfactory in estimating the risk for significant NHB, especially in heterozygous females that could present phenotype overlap between normal homozygotes, heterozygotes, and deficient homozygotes, resulting in a continuum of intermediate G6PD activity. Objective: To examine the association of genotype and phenotype in newborns with decreased G6PD activity and its relation to NHB. Study design: Quantitative G6PD enzyme activities were measured on umbilical cord blood samples. After accepting parental consent, samples were analyzed for G6PD mutations and UGT1A1 gene polymorphisms (number of TA repeats in the UGT1A1 promoter). The associations to quantitative G6PD activity and bilirubin levels were assessed. Results: 28 females and 27 males were studied. The Mediterranean mutation (NM_001360016.2(G6PD): c.563C&gt;T (p.Ser188Phe)) was responsible for most cases of G6PD deficiency (20 hemizygous males, 3 homozygous and 16 heterozygous females). The association between this mutation, decreased G6PD activity and higher bilirubin levels was confirmed. Heterozygosity to 6\/7 TA repeats in the UGT1A1 promoter was associated with increased NHB, especially in female newborns with G6PD deficiency. However, it seems that the interaction between G6PD deficiency, UGT1A1 promoter polymorphism, and NHB is more complex, possibly involving other genetic interactions, not yet described. Despite genotyping females with G6PD deficiency, the overlap between the upper range of borderline and the lower range of normal G6PD activity could not be resolved. Conclusions: The results of this study highlight the possibility for future implementation of molecular genetic screening to identify infants at risk for significant NHB, especially UGT1A1 polymorphism in heterozygous females with borderline G6PD deficiency. However, further studies are needed before such screening could be applicable to daily practice.<\/jats:p>","DOI":"10.3390\/children10071172","type":"journal-article","created":{"date-parts":[[2023,7,7]],"date-time":"2023-07-07T01:41:36Z","timestamp":1688694096000},"page":"1172","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The Genetics of Glucose-6-Phosphate-Dehydrogenase (G6PD) and Uridine Diphosphate Glucuronosyl Transferase 1A1 (UGT1A1) Promoter Gene Polymorphism in Relation to Quantitative Biochemical G6PD Activity Measurement and Neonatal Hyperbilirubinemia"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5937-9620","authenticated-orcid":false,"given":"Arieh","family":"Riskin","sequence":"first","affiliation":[{"name":"Department of Neonatology, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yulia","family":"Bravdo","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Clair","family":"Habib","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irit","family":"Maor","sequence":"additional","affiliation":[{"name":"Biochemistry Laboratory, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julnar","family":"Mousa","sequence":"additional","affiliation":[{"name":"The Simon Winter Institute for Human Genetics, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sizett","family":"Shahbarat","sequence":"additional","affiliation":[{"name":"The Simon Winter Institute for Human Genetics, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elena","family":"Shahak","sequence":"additional","affiliation":[{"name":"The Simon Winter Institute for Human Genetics, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5209-2072","authenticated-orcid":false,"given":"Adel","family":"Shalata","sequence":"additional","affiliation":[{"name":"The Simon Winter Institute for Human Genetics, Bnai Zion Medical Center, Ruth & Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa 32000, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"American Academy of Pediatrics Subcommittee on Hyperbilirubinemia (2004). 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