Gene polymorphism identified by PvuII in familial lipoprotein lipase deficiency.

We previously demonstrated that the PvuII polymorphism is a useful marker to analyze the genetic defects in familial lipoprotein lipase (LPL) deficiency. In this study, we have mapped this polymorphic site and cloned the gene fragments containing this site from a patient and a normal subject. Comparative sequence analysis revealed that a C-T transition occurred in the gene of the patient at the PvuII site in the intron 6. Interestingly, the sequence near the PvuII site showed a significant homology to the consensus sequence of the 3' splice site. In addition, the insertional event into the human LPL gene, which was recently reported for a population of Caucasian patients, was not observed for eight unrelated Japanese patients, suggesting that genetic defects underlying familial LPL deficiency should be heterogeneous among races.