title: Analysis of the INK4a/ARF locus in non-Hodgkin's lymphomas using two new internal microsatellite markers.
abstract: Inactivation of the INK4a/ARF locus is a frequent event in non-Hodgkin's lymphomas (NHLs), which may be attributed to deletion, point mutation, and 5' CpG methylation at its promoter region. In the present study we evaluated the occurrence of deletions and genetic instability of INK4a/ARF locus in 30 paired normal and tumor samples of B cell NHLs by conducting an allelotypic analysis with two new polymorphic markers, one located at the intron 1 of p16INK4a gene and the other one placed downstream exon 1beta of p19ARF. Comparison of these results with those obtained in a previous paper using flanking markers (D9S171, D9S942, D9S958 and IFNA) allowed us to detect two new cases of microsatellite instability (L-446 and L-442), and to confirm the occurrence of LOH at the INK4a/ARF locus in one tumor (M-3770). On the contrary, this locus is not affected in three different tumors (L-421, L-272 and L-159) which exhibited LOH at some of the flanking markers.
authors.affiliation: Departamento de Biología, Universidad Autónoma de Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Herranz
authors.forename: M
authors.initials: M
authors.lastname: Urioste
authors.forename: J
authors.initials: J
authors.lastname: Santos
authors.forename: C
authors.initials: C
authors.lastname: Rivas
authors.forename: B
authors.initials: B
authors.lastname: Martínez
authors.forename: J
authors.initials: J
authors.lastname: Benitez
authors.forename: J
authors.initials: J
authors.lastname: Fernández-Piqueras
mesh_terms: D002874:Chromosome Mapping; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000235:genetics*; D006801:Humans; D019656:Loss of Heterozygosity; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics*; D018895:Microsatellite Repeats
chemical_list: D019941:Cyclin-Dependent Kinase Inhibitor p16