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• W2076239574 abstract "Biotin deficiency (Bt-D) is usually studied at the point at which the animal model exhibits the signs of full-blown deficiency symptoms; in rats, this typically occurs at 6-8 weeks of feeding a deficient diet. To differentiate specific deficiency effects from those of undernutrition, biotin sufficient and deficient rats were studied at 2, 3, 4, and 5 weeks on the deficiency diet, before the onset of weight loss and deficiency signs. The deficiency state was confirmed by biochemical and molecular analyses. Blood and liver metabolites were determined and western blots of signaling proteins, and qRT-PCR gene expression studies. The main effects of Bt-D were already well established by the fourth week on the diet; thus, we consider the fourth week as the optimum time to study the consequences of biotin depletion. Early effects, which were already apparent at week 2, included cellular energy deficit (as assessed by increased AMP/ATP ratio), activation of the AMPK energy sensor, and changes of carbon metabolism gene transcripts (e.g., phosphoenolpyruvate carboxykinase, carnitine palmitoyl transferase 1, liver glucokinase and fatty acid synthetase). Reduced post-prandial blood concentrations of glucose were also observed early; we speculate that these are attributable to augmented sensitivity to insulin and increased glucose utilization, a likely effect of AMPK induction of translocation of glucose transporter GLUT4 to the cell membranes and increased hexokinase expression. Other late-onset changes (week 4) included increased serum concentrations of lactate and free fatty acids and decreased liver glycogen and serum concentrations of triglycerides and total cholesterol. The identification of the early specific molecular and metabolic disturbances of biotin deficiency might be useful in identifying individuals with marginal deficiency of this vitamin, which appears to be common in normal human pregnancy. The study of time-course of other vitamin deficiencies, such as this one, might help to better understand and cope with their effects." @default.
• W2076239574 created "2016-06-24" @default.
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• W2076239574 date "2012-11-01" @default.
• W2076239574 modified "2023-10-18" @default.
• W2076239574 title "Temporal development of genetic and metabolic effects of biotin deprivation. A search for the optimum time to study a vitamin deficiency" @default.
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• W2076239574 doi "https://doi.org/10.1016/j.ymgme.2012.09.005" @default.
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