Humpath.com - Human pathology

Home > D. General pathology > Genetic and developmental anomalies > Li-Fraumeni syndrome

Li-Fraumeni syndrome

Thursday 11 November 2004

Autosomal dominant transmission.

Synopsis

 Predispsotion to tumors (unusually early age of tumor onset
frequent multiple primary tumors)

 Impaired lymphocyte transformation with phytohemagglutinin
 Polyclonal IgM elevation

Etiology (3 known loci)

 Locus 9p21
 Locus TP53 at 17p13.1: germline mutations in the TP53 gene coding for protein p53
 Locus CHEK2 at 22q12.1: germline mutations in the CHEK2 gene (MIM.604373). CHEK2 is a protein kinase activated in response to DNA damage, is involved in cell cycle arrest.