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• W2119001489 abstract "Previous mutations associated with lecithin:cholesteryl acyltransferase (LCAT) deficiency syndromes have been identified in the coding regions of the LCAT gene. However, recently, an intron mutation was found in a family in which three sisters presented with fish-eye disease (FED). The probands were shown to be heterozygotes for a mutation in intron 4. The respective T→C nucleotide substitution, 22 bases upstream of the 3′-splice site, causes a null allele as the result of complete intron retention. Since the natural mutation occurs in a putative branchpoint consensus sequence of the intron, it was hypothesized that the point mutation may disrupt the splicing of the pre-mRNA. To further study the functional significance of the above thymine residue in the branchpoint sequence, we introduced other nucleotides at this position, i.e., LCAT Int-4 MUT-1 (T→G) and LCAT Int-4 MUT-2 (T→A). After stable transfection of the mutated pNUT-LCAT minigenes into BHK cells, we could detect neither LCAT activity nor LCAT protein in the culture medium of the pNUT-LCAT Int-4 MUT-1 and pNUT-LCAT Int-4 MUT-2 cell lines, as was previously described for the natural mutation. To determine the effects of the introduced mutations on pre-mRNA splicing, total RNA from transfected BHK cells was used for RT-PCR analysis. All BHK cell lines were shown to transcribe the integrated LCAT minigenes. However, the sizes of these LCAT messengers indicated that intron 4 was retained in the pNUT-LCAT Int-4 MUT-1 and pNUT-LCAT Int-4 MUT-2 cell lines. Subsequent sequence analysis of the RT-PCR products demonstrated that the unspliced intronic sequences contained the introduced mutations. In conclusion, the observed retention of intron 4 of the LCAT gene is the result of the specific loss of a thymine residue two bases upstream of the branchpoint adenosine residue in the putative branchpoint consensus sequence. The results confirm that a single base change in the branchpoint consensus sequence of an intron can cause human disease although this sequence is poorly conserved in mammals." @default.
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• W2119001489 date "1998-03-01" @default.
• W2119001489 modified "2023-09-27" @default.
• W2119001489 title "T→G or T→A mutation introduced in the branchpoint consensus sequence of intron 4 of lecithin:cholesterol acyltransferase (LCAT) gene: intron retention causing LCAT deficiency" @default.
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• W2119001489 doi "https://doi.org/10.1016/s0005-2760(97)00198-7" @default.
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