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• W1977346314 abstract "Deoxyguanosine kinase deficiency (dGK) is a frequent cause of the hepatocerebral form of mitochondrial depletion syndrome (MDS). A group of 28 infants with severe progressive liver failure of unknown cause was recruited for post mortem search for deoxyguanosine kinase (DGUOK) gene mutations. Four affected patients (14% of the studied group), two homozygotes, one compound heterozygote, and one heterozygote, with DGUOK mutation found on only one allele, were identified. Three known pathogenic mutations in the DGUOK gene were detected, c.3G>A (p.Met1Ile), c.494A>T (p.Glu165Val), and c.766_767insGATT (p.Phe256X), and one novel molecular variant of unknown pathogeneity, c.813_814insTTT (p.Asn271_Thr272insPhe). Profound mitochondrial DNA depletion was confirmed in available specimens of the liver (4%, 15%, and 10% of the normal value) and in the muscle (4%, 23%, 45%, and 6%, respectively). The patients were born with low weights for gestational age and they presented adaptation trouble during the first days of life. Subsequently, liver failure developed, leading to death at the ages of 18, 6, 5.5, and 2.25 months, respectively. Mild neurological involvement was observed in all children (hypotonia, psychomotor retardation, and ptosis). Hypoglycemia (hypoketotic) and lactic acidosis were the constant laboratory findings. Elevated transferrin saturation, high ferritin, and alpha-fetoprotein levels resembled, in two cases, a neonatal hemochromatosis. Liver histopathology showed severe hepatic damage ranging from micronodular formation and cirrhosis to the total loss of liver architecture with diffuse fibrosis and neocholangiolar proliferation. Pancreatic islet cell hyperplasia with numerous confluent giant islets was found in both autopsied infants. Analysis of the natural history of the disease in our patients and the literature data led us to the following observations: (i) islet cell hyperplasia (and hyperinsulinism) may contribute to MDS-associated hypoglycemia; (ii) iron overload may additionally damage mtDNA-depleted tissues; (iii) low birth weight, adaptation trouble, and abnormal amino acids in newborn screening are frequent in dGK-deficient neonates." @default.
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• W1977346314 date "2010-11-16" @default.
• W1977346314 modified "2023-10-18" @default.
• W1977346314 title "Post mortem identification of deoxyguanosine kinase (DGUOK) gene mutations combined with impaired glucose homeostasis and iron overload features in four infants with severe progressive liver failure" @default.
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• W1977346314 doi "https://doi.org/10.1007/s13353-010-0008-y" @default.
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