The gamma-globin gene promoter progressively demethylates as the hematopoietic stem progenitor cells differentiate along the erythroid lineage in baboon fetal liver and adult bone marrow.
Exp Hematol
; 35(1): 48-55, 2007 Jan.
Article
en En
| MEDLINE
| ID: mdl-17198873
ABSTRACT
OBJECTIVE:
To determine whether the difference in gamma-globin gene promoter methylation in terminal erythroblasts at the fetal and adult stages of development is a result of fetal stage-specific demethylation or adult stage-specific de novo methylation during erythropoiesis. MATERIALS ANDMETHODS:
Fetal liver- (FL, n = 2) and adult bone marrow- (ABM, n = 3) derived hematopoietic stem/progenitor cells and mature erythroblasts were purified by passage through a Miltenyi Magnetic Column followed by fluorescein-activated cell sorting (FACS) into subpopulations, defined by expression of CD34 and CD36 antigens. CD34(+)CD36(-), CD34(+)CD36(+), and CD34(-)CD36(+) subpopulations were purified by FACS and their degree of differentiation verified using the colony-forming cell assay. The methylation pattern of 5 CpG sites in the gamma-globin promoter region of these purified cell populations was determined using bisulfite sequencing.RESULTS:
The gamma-globin promoter was highly methylated in the earliest stage of hematopoietic stem progenitor cells (CD34(+)CD36(-)) and methylation progressively decreased as erythroid differentiation progressed in FL and appears so in ABM as well.CONCLUSIONS:
These data support a model in which differences in the methylation pattern of the gamma-globin gene in differentiating erythroblasts at different stages of development is the result of fetal stage-specific demethylation associated with transcriptional activation, rather than de novo methylation in the adults. The difference in the extent of gamma-globin gene demethylation in FL and ABM is correlated with the difference in gamma-globin expression at these developmental stages.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Globinas
/
Células Madre Hematopoyéticas
/
Diferenciación Celular
/
Regiones Promotoras Genéticas
/
Linaje de la Célula
/
Metilación de ADN
/
Células Eritroides
Límite:
Animals
Idioma:
En
Revista:
Exp Hematol
Año:
2007
Tipo del documento:
Article
País de afiliación:
Estados Unidos