title: Allelic imbalance mapped to 6q14.1 is associated with loss of expression of 5-HT receptor 1B in non-Hodgkin lymphomas.
abstract: Previous studies on lymphomas suggested that the long arm of chromosome 6 harbors 1 or more tumor suppressor genes. This study analyzed the status of 25 microsatellite markers in 39 cases, including 9 nodal and 30 extranodal, of non-Hodgkin lymphomas. Thirty of the 39 cases (77%) showed abnormality in at least 1 of the markers. Of the 655 informative results, 135 (20%) were abnormal. These included 5 homozygous deletions, 91 allelic imbalances (AI), and 38 microsatellite instability. The 2 commonest regions of abnormality were mapped to 6q14.1 and 6q27. There was no significant difference in the frequency of these regional losses between nodal and extranodal lymphomas, B-or T-cell lineage, and association with Epstein-Barr virus. The first common deletion region at 6q14.1 is flanked by the HTR1B (5-hydroxytryptamine receptor 1B) gene proximally and a novel unknown gene. AI in the region was found associated with loss of expression HTR1B by RT-PCR. The deletion region at 6q27 was narrowed to approximately 3Mb and maximal at marker D6S386. This locus includes the recently identified SMOC2 (secreted modular calcium-binding protein 2), AF6, and DLL1 (human delta-like 1 protein) genes. RT-PCR analyses of AF6 and DLL1 expression showed poor correlation with the AI results.
authors.affiliation: Department of Anatomical & Cellular Pathology, The Chinese University of Hong Kong, Shatin, Hong Kong.
authors.forename: Christine Y S
authors.initials: CY
authors.lastname: Li
authors.forename: Chit
authors.initials: C
authors.lastname: Chow
authors.forename: Wing Y
authors.initials: WY
authors.lastname: Chan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D022981:Allelic Imbalance; D002648:Child; D002896:Chromosomes, Human, Pair 6 / Q000235:genetics*; D005260:Female; D006801:Humans; D017403:In Situ Hybridization; D019656:Loss of Heterozygosity; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics*; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D044302:Receptor, Serotonin, 5-HT1B / Q000096:biosynthesis*
chemical_list: D044302:Receptor, Serotonin, 5-HT1B