title: Altered hematopoiesis in trisomy 21 as revealed through in vitro differentiation of isogenic human pluripotent cells.
abstract: Trisomy 21 is associated with hematopoietic abnormalities in the fetal liver, a preleukemic condition termed transient myeloproliferative disorder, and increased incidence of acute megakaryoblastic leukemia. Human trisomy 21 pluripotent cells of various origins, human embryonic stem (hES), and induced pluripotent stem (iPS) cells, were differentiated in vitro as a model to recapitulate the effects of trisomy on hematopoiesis. To mitigate clonal variation, we isolated disomic and trisomic subclones from the same parental iPS line, thereby generating subclones isogenic except for chromosome 21. Under differentiation conditions favoring development of fetal liver-like, γ-globin expressing, definitive hematopoiesis, we found that trisomic cells of hES, iPS, or isogenic origins exhibited a two- to fivefold increase in a population of CD43(+)(Leukosialin)/CD235(+)(Glycophorin A) hematopoietic cells, accompanied by increased multilineage colony-forming potential in colony-forming assays. These findings establish an intrinsic disturbance of multilineage myeloid hematopoiesis in trisomy 21 at the fetal liver stage.
authors.affiliation: Division of Hematology/Oncology, Boston Children's Hospital and Department of Pediatric Oncology, Dana Farber Cancer Institute, Boston, MA 02115, USA.
authors.forename: Glenn A
authors.initials: GA
authors.lastname: Maclean
authors.forename: Tobias F
authors.initials: TF
authors.lastname: Menne
authors.forename: Guoji
authors.initials: G
authors.lastname: Guo
authors.forename: Danielle J
authors.initials: DJ
authors.lastname: Sanchez
authors.forename: In-Hyun
authors.initials: IH
authors.lastname: Park
authors.forename: George Q
authors.initials: GQ
authors.lastname: Daley
authors.forename: Stuart H
authors.initials: SH
authors.lastname: Orkin
mesh_terms: D002454:Cell Differentiation; D004314:Down Syndrome; D020869:Gene Expression Profiling; D006410:Hematopoiesis; D006801:Humans; D007621:Karyotyping; D039904:Pluripotent Stem Cells / Q000166:cytology*; D016133:Polymerase Chain Reaction