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New mutations in the lipoprotein lipase gene in a young boy with chylomicronaemia syndrome and in his family
Author(s) -
Brites F,
Henriksen F,
Fernández K,
Brusgaard K,
Castro G,
Wikinski R
Publication year - 2003
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.2003.tb02517.x
Subject(s) - proband , lipoprotein lipase , medicine , endocrinology , exon , gene , compound heterozygosity , lipoprotein , heterozygote advantage , phenotype , genetics , mutation , cholesterol , genotype , biology , adipose tissue
The case is reported of a 4‐y‐old boy with chylomicronaemia syndrome, under treatment with a low‐fat diet and medium‐chain triglycerides. The clinical and biochemical characteristics of the patient and 11 members of his family were studied. Lipoprotein profile, lipoprotein lipase (LPL) mass and activity were evaluated. Nucleotide substitutions in LPL promoter and exons were screened. The proband presented with severe hypertriglyceridaemia (triglycerides = 13.25 mmol l −1 ) and non‐detectable LPL activity and mass. The boy was a compound heterozygote for four molecular defects in the LPL gene, two of which have not been reported before (C±T 764 ± C±T/Arg 170 ± Leu; GG± 1482 ± GG±Gly 409 ± Gly). Among the family members, the proband was the only one who carried two genetic variants that modify LPL amino acid composition. Conclusion : The association of different alterations in the LPL gene could be a key factor in causing the severe phenotype observed. Moreover, treatment with a low‐fat diet and medium‐chain triglycerides failed to normalize the patient's hypertriglyceridaemia.