title: High-resolution analysis of genetic stability of human adipose tissue stem cells cultured to senescence.
abstract: The potential use of human mesenchymal stem cells for therapeutic applications implies large scale in vitro culture, increasing the probability of genetic instability and transformation. We examine here the incidence of unbalanced and balanced chromosome rearrangements in polyclonal and single cell-derived cultures of human adipose stem cells to senescence. G-banding karyotyping of the polyclonal cultures shows a normal karyotype. In addition, high-resolution microarray-based comparative genomic hybridization analyses relative to uncultured adipose stem cells from the same donors reveal overall genomic stability in long-term (approximately 6 months) polyclonal and clonal culture. One adipose stem cell clone displayed minor deletions in gene-rich telomeric and sub-telomeric regions on three chromosomes in early passage. This however, was detected only in a sub-population of cells that was subsequently spontaneously eliminated from the culture. Apparent pericentromeric instabilities are also occasionally detected in specific chromosomes. Our results indicate that clonal chromosomal aberrations may arise transiently in early passage adipose stem cells (ASC) cultures. Nonetheless, incidence of these aberrations seems to be negligible in the majority of long-term ASC cultures, at least under the culture conditions used here.
authors.affiliation: Department of Tumor Biology, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway.
authors.forename: Leonardo A
authors.initials: LA
authors.lastname: Meza-Zepeda
authors.forename: Agate
authors.initials: A
authors.lastname: Noer
authors.forename: John Arne
authors.initials: JA
authors.lastname: Dahl
authors.forename: Francesca
authors.initials: F
authors.lastname: Micci
authors.forename: Ola
authors.initials: O
authors.lastname: Myklebost
authors.forename: Philippe
authors.initials: P
authors.lastname: Collas
mesh_terms: D000273:Adipose Tissue / Q000166:cytology* / Q000378:metabolism; D002478:Cells, Cultured; D016922:Cellular Senescence / Q000235:genetics*; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D002877:Chromosomes, Human / Q000235:genetics; D002999:Clone Cells / Q000166:cytology; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D044127:Epigenesis, Genetic; D018628:Gene Dosage; D042822:Genomic Instability; D006801:Humans; D007621:Karyotyping; D021141:Nucleic Acid Amplification Techniques; D009693:Nucleic Acid Hybridization; D013234:Stem Cells / Q000166:cytology*
chemical_list: D004247:DNA