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Apo C-II deficiency type bari

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Abstract

We formerly studied an Italian familiy with apo C-II deficiency. Two probands were homozygous for the defect (immeasurable circulating apolipoprotein C-II and absence of C-II bands on immunoelectrophoresis). We documented the synthesis of the protein at the intestinal level in the probands with immunohistological techniques.

With the purpose of investigating the molecular basis of the defect, Southern analysis, polymerase chain reaction (PCR) amplification and sequence analysis were carried out on one of the two cases. We identified a point mutation C to G transversion in the third exon of the gene causing a premature stop codon. Our hypothesis is that the truncated protein of 36 aa., instead of 79 aa., lacks its functional domain. This causes inefficiency in the activation of lipoprotein lipase (LPL) and the instability of the circulating molecule, which could have an higher catabolic rate compared to a normal protein. The faster disappearance from the circulating compartment make it unmeasurable.

The mutation destroys a Rsa I site, present in the normal gene sequence. We suggest the use of this site for a rapid Restriction Fragment Length Polymorphism (RFLP) on PCR amplification products to screen this defect in the Italian population.

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Authors and Affiliations

  1. Chair of Geriatrics and Institute of Clinical Medicine, University of Ball Medical School, Piazza G. Cesare 11, 70124, Bari, Italy

    A. Capurso, F. Resta, F. Turturro & A. M. Colacicco

  2. SMME-CNR Centre and Department of Biochemistry and Molecular Biology, University of Bari Bari, Italy

    C. Crecchio & G. Pepe

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  1. A. Capurso
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  2. F. Resta
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  3. F. Turturro
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  4. A. M. Colacicco
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  5. C. Crecchio
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  6. G. Pepe
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Capurso, A., Resta, F., Turturro, F. et al. Apo C-II deficiency type bari. Eur J Epidemiol 8 (Suppl 1), 64–70 (1992). https://doi.org/10.1007/BF00145352

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