Array-based comparative genomic hybridization of mapped BAC DNA clones to screen for chromosome 14 copy number abnormalities in meningiomas.
Chromosome 14 loss in meningiomas are associated with more aggressive tumour behaviour. To date, no studies have been reported in which the entire chromosome 14q of meningioma tumour cells has been studied by high-resolution array comparative genomic hybridization (a-CGH). Here, we used a high-resolution a-CGH to define the exact localization and extent of numerical changes of chromosome 14 in meningioma patients. An array containing 807 bacterial artificial chromosome clones specific for chromosome 14q (average resolution of approximately 130 Kb) was constructed and applied to the study of 25 meningiomas in parallel to the confirmatory interphase fluorescence in situ hybridization (iFISH) analyses. Overall, abnormalities of chromosome 14q were detected in 10/25 cases (40%). Interestingly, in seven of these cases, loss of chromosome 14q32.3 was detected by iFISH and confirmed to correspond to monosomy 14 by a-CGH. In contrast, discrepant results were found between iFISH and a-CGH in the other three altered cases. In one patient, a diploid background was observed by iFISH, while monosomy 14 was identified by a-CGH. In the remaining two cases, which showed gains of the IGH gene by iFISH, a-CGH did not detected copy number changes in one case showing a tetraploid karyotype, while in the other tumour, varying genetic imbalances along the long arm of chromosome 14 were detected. In summary, here, we report for the first time, the high-resolution a-CGH profiles of chromosome 14q in meningiomas, confirming that monosomy 14 is the most frequent alteration associated with this chromosome; other numerical abnormalities being only sporadically detected.
Espinosa
Ana Belén
AB
Unidad de Investigación, Hospital Universitario de Salamanca, Salamanca, Spain.
Mackintosh
Carlos
C
Maíllo
Angel
A
Gutierrez
Laura
L
Sousa
Pablo
P
Merino
Marta
M
Ortiz
Javier
J
de Alava
Enrique
E
Orfao
Alberto
A
Tabernero
María Dolores
MD
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002869:Chromosome Aberrations; D022202:Chromosomes, Artificial, Bacterial / Q000737:chemistry / Q000235:genetics*; D002883:Chromosomes, Human, Pair 14; D003001:Cloning, Molecular; D055028:Comparative Genomic Hybridization / Q000379:methods*; D004247:DNA / Q000032:analysis; D005260:Female; D018628:Gene Dosage / Q000235:genetics; D006801:Humans; D008297:Male; D008577:Meningeal Neoplasms / Q000235:genetics*; D008579:Meningioma / Q000235:genetics*; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D012008:Recurrence; D017422:Sequence Analysis, DNA
D004247:DNA