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Diabetes mellitus is a group of metabolic diseases characterized by chronic hyperglycemia resulting from defects in insulin secretion, insulin action, or both.
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Infantile onset diabetes mellitus is not uncommon metabolic disorder in children, with rising in the incidence in the last few years. Infants with onset of diabetes mellitus at age less than one year are likely to have transient or permanent neonatal diabetes mellitus or rarely type one diabetes, all infants with onset of diabetes at less than one year of age need to undergo genetic evaluation for monogenic diabetes as is most commonly due to activating mutations in either of the genes encoding the two subunits of the adenosine tri-phosphate-sensitive potassium channel (potassium channel, inwardly rectifying subfamily J member 11 and adenosine tri-phosphate-binding cassette, sub-family C, member 8) as those patients will respond to therapy with sulphonylurea lead to good glycemic control and management of other comorbid factors. Evaluation with auto-immune antibodies may be warranted in infants with onset of diabetes in late infancy as the chances of type 1 diabetes presenting in late infancy has been reported in the literature.
Type 1 diabetes mellitus is one of the most common endocrine and metabolic conditions in childhood.
Data from large epidemiological studies worldwide indicate that on an annual basis, the overall increase in the incidence of type one diabetes is around three percent.
There is increase in incidence of type one diabetes mellitus throughout the world especially, marked in young children, Registries in Europe suggest that incidence of type one diabetes mellitus were highest in the youngest age-group (0-4 years).
The underlying pathophysiological mechanism of the disease is cellular-mediated autoimmune destruction of the pancreatic beta-cells.
The triggers for the autoimmune attack are not fully understood, but it is now widely accepted that both environmental and genetic factors contribute to it.
The strongest gene for type one diabetes mellitus, is located in the major histocompatibility complex Class II region on chromosome 6, at staining region 6p21.
Environmental factors can influence expression of type 1 diabetes and this can be suggested by the identical twins, when one twin has type 1 diabetes, the other twin only has it 30%-50% of the time.
It has been reported that only 10% of those who are genetically predisposed to type one diabetes actually develop the disease; however, that percentage appears to be changing and environmental factors may play an increasingly important role in determining risk.
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