Organization of the human CD40L gene: Implications for molecular defects in X chromosome-linked hyper-IgM syndrome and prenatal diagnosis

Anna Villa, Luigi D. Notarangelo, James P. Di Santo, Paolo P. Macchi, Dario Strina, Annalisa Frattini, Franco Lucchini, Cristina M. Patrosso, Silvia Giliani, Elide Mantuano, Silvano Agosti, Gianfranco Nocera, Richard A. Kroczek, Alain Fischer, Alberto G. Ugazio, Geneviève De Saint Basile, Paolo Vezzoni

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, CD40L has been identified as the gene responsible for X chromosome-linked hyper-IgM syndrome (HIGM1). CD40L on activated T cells from HIGM1 patients fails to bind B-cell CD40 molecules, and subsequent analysis of CD40L transcripts by reverse transcription PCR demonstrated coding region mutations in these patients. This approach, however, is of limited use for prenatal diagnosis of HIGM1 in the early-gestation fetus. In this report, we have defined the genomic structure of the CD40L gene, which is composed of five exons and four intervening introns. With this information, we have defined at the genomic level the CD40L gene abnormalities for three previously described HIGM1 patients who demonstrated clustered deletions in the CD40L coding region. These different deletions arose from three distinct mechanisms, including (i) a splice donor mutation with exon skipping, (ii) a splice acceptor mutation with utilization of a cryptic splice site, and (iii) a deletion/insertion event with the creation of a new splice acceptor site. In addition, we have performed prenatal evaluation of an 11-week-old fetus at risk for HIGM1. CD40L genomic clones provide a starting point for further studies of the genetic elements that control CD40L expression. Our knowledge of the CD40L gene structure will prove useful for the identification of additional mutations in HIGM1 and for performing genetic counseling about this disease.

Original languageEnglish
Pages (from-to)2110-2114
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume91
Issue number6
Publication statusPublished - Mar 15 1994

ASJC Scopus subject areas

  • General
  • Genetics

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