A novel splicing mutation causes analbuminemia in a Portuguese boy

Gianluca Caridi, Monica Dagnino, Marco Di Duca, Helena Pinto, Maria do Céu Espinheira, António Guerra, Susana Fernandes, Monica Campagnoli, Monica Galliano, Lorenzo Minchiotti

Research output: Contribution to journalArticlepeer-review

Abstract

Analbuminemia is a rare autosomal recessive disorder manifested by the absence or severe reduction of circulating serum albumin in homozygous or compound heterozygous subjects. It is an allelic heterogeneous defect, caused by a variety of mutations within the albumin gene. The analbuminemic condition was suspected in a Portuguese boy who presented with low albumin level (about 3.8. g/L) and a significant hypercholesterolemia, but with no clinical findings. The albumin gene was screened by single strand conformational polymorphism and heteroduplex analysis and submitted to direct DNA sequencing. The proband was found to be homozygous for a previously unreported G > A change at position c.1289. +. 1, the first base of intron 10, which inactivates the strongly conserved GT dinucleotide at the 5' splice site consensus sequence of the intron. The effect of this mutation was evaluated by examining the cDNA obtained by RT-PCR from the albumin mRNA extracted from proband's leukocytes. The splicing defect results in the skipping of the preceding exon. The subsequent reading frame-shift in exon 11 produces a premature stop codon located 33 codons downstream the 5' end of the exon. This extensive cDNA alteration is responsible for the analbuminemic trait. Both parents were found to be heterozygous for the same mutation. DNA and cDNA sequence analysis established the diagnosis of congenital analbuminemia in the proband. The effects of the so far identified splice-site mutations in the albumin gene are discussed.

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalMolecular Genetics and Metabolism
Volume105
Issue number3
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Albumin gene
  • Analbuminemia
  • DNA and cDNA sequence analysis
  • Heteroduplex analysis
  • Human serum albumin
  • Splicing mutation

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Genetics
  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

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