The lipoprotein lipase coding gene sequence was analysed on a 10-year-old girl with new-onset Type 1 diabetes mellitus (DM), ketoacidosis and severe hypertriglyceridaemia (TG > 112.9 mmol/l), revealing that the patient was a compound heterozygote for two mutations, D9N in exon 2 and S447X in exon 9. Although these two mutations usually do not considerably impair lipolytic enzyme activity, the combination of both in this patient may play a role in the development of severe hypertriglyceridaemia.
to the best of our knowledge, this is the first description of a patient with a M301R mutation in the lipoprotein lipase gene. In addition, dietary therapy with medium-chain triglycerides was successful supporting the effectiveness of this therapeutic approach in familial chylomicronaemia syndrome.
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