Delineation of a minimal region of deletion at 6q16.3 in follicular lymphoma and construction of a bacterial artificial chromosome contig spanning a 6-megabase region of 6q16-q21.
Regional deletions of 6q are frequent karyotypic alterations in malignant lymphoma and are associated with an adverse clinical outcome. One such region of recurrent deletion is 6q16-q21; however, the specific genes affected have not been identified. Our objective in this study was to identify cases with deletion of 6q16-q21 in follicular lymphoma and to define a minimal region of deletion. A physical map of 6q16.2-q21 was constructed using map information from both sequence-based and bacterial artificial chromosome (BAC) fingerprint-based maps. Forty-three BAC clones spanning a 6-Mb region of 6q16.2-q21 were identified and obtained from the RP-11 library. Selected BACs were fluorescence-labeled and hybridized to a series of 34 follicular lymphomas with a regional 6q deletion detected by G banding. Twenty-four cases with deletion of the 6q16.3 region were detected. A minimal deletion of 2.3 Mb was defined. Our study has identified a limited region of deletion of 6q16.3 that may implicate four known genes in follicular lymphoma and possibly in other cancers. A BAC contig spanning a 6-Mb region has been anchored to the 6q16.2-q21 region. This map represents a useful resource for gene identification in this region, not only in lymphoma but also in other neoplasms with 6q alterations.
Henderson
Laura-Jane
LJ
British Columbia Cancer Agency, Vancouver, BC, Canada. ljhender@bccrc.ca
Okamoto
Ichiro
I
Lestou
Valia S
VS
Ludkovski
Olga
O
Robichaud
Marc
M
Chhanabhai
Mukesh
M
Gascoyne
Randy D
RD
Klasa
Richard J
RJ
Connors
Joseph M
JM
Marra
Marco A
MA
Horsman
Douglas E
DE
Lam
Wan L
WL
D002872:Chromosome Deletion; D002874:Chromosome Mapping / Q000379:methods*; D022202:Chromosomes, Artificial, Bacterial / Q000235:genetics*; D002896:Chromosomes, Human, Pair 6 / Q000235:genetics*; D003001:Cloning, Molecular / Q000379:methods*; D020451:Contig Mapping / Q000379:methods*; D005260:Female; D006801:Humans; D018404:Isochromosomes / Q000235:genetics; D007621:Karyotyping; D008224:Lymphoma, Follicular / Q000235:genetics*; D008297:Male