Genomic Instability of Human Embryonic Stem Cell Lines Using Different Passaging Culture Methods

Overview

Journal Mol Cytogenet

Publisher Biomed Central

Specialty Biochemistry

Date 2015 Jun 9

PMID 26052346

Citations 11

Authors

Lucie Tosca

Olivier Feraud

Aurelie Magniez

Cecile Bas

Frank Griscelli

Annelise Bennaceur-Griscelli

Gerard Tachdjian

Affiliations

Soon will be listed here.

Abstract

Background: Human embryonic stem cells exhibit genomic instability that can be related to culture duration or to the passaging methods used for cell dissociation. In order to study the impact of cell dissociation techniques on human embryonic stem cells genomic instability, we cultured H1 and H9 human embryonic stem cells lines using mechanical/manual or enzymatic/collagenase-IV dissociation methods. Genomic instability was evaluated at early (<p60) and late (>p60) passages by using oligonucleotide based array-comparative genomic hybridization 105 K with a mean resolution of 50 Kb.

Results: DNA variations were mainly located on subtelomeric and pericentromeric regions with sizes <100 Kb. In this study, 9 recurrent genomic variations were acquired during culture including the well known duplication 20q11.21. When comparing cell dissociation methods, we found no significant differences between DNA variations number and size, DNA gain or DNA loss frequencies, homozygous loss frequencies and no significant difference on the content of genes involved in development, cell cycle tumorigenesis and syndrome disease. In addition, we have never found any malignant tissue in 4 different teratoma representative of the two independent stem cell lines.

Conclusions: These results show that the occurrence of genomic instability in human embryonic stem cells is similar using mechanical or collagenase IV-based enzymatic cell culture dissociation methods. All the observed genomic variations have no impact on the development of malignancy.

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