Broadening of DNA replication origin usage during metazoan cell differentiation.
We have examined whether replication of the chicken beta-globin locus changes during differentiation of primary erythroid progenitors into erythrocytes. In undifferentiated progenitors, four principal initiation sites and a replication fork pausing region (RFP) were observed. Forty-eight hours after induction of differentiation, the principal sites were maintained, even in the activated beta(A)-globin gene, some minor sites were enhanced, three new sites appeared and the RFP disappeared. One of the activated origins showed increased histone H3 K9K14 diacetylation, but the others did not. These results demonstrate a broadening of DNA replication origin usage during differentiation of untransformed metazoan cells and indicate that histone H3 diacetylation, other histone modifications so far reported and transcription are not crucial determinants of origin selection in this system.
Dazy
Sébastien
S
Centre de Génétique Moléculaire et Cellulaire, Université Claude Bernard-Lyon I, 16 rue Dubois, 69622 Villeurbanne Cedex, France.
Gandrillon
Olivier
O
Hyrien
Olivier
O
Prioleau
Marie-Noëlle
MN
D000107:Acetylation; D000818:Animals; D002454:Cell Differentiation / Q000235:genetics*; D002843:Chromatin / Q000235:genetics / Q000378:metabolism; D047369:Chromatin Immunoprecipitation; D004261:DNA Replication / Q000235:genetics*; D041905:Erythroid Cells / Q000166:cytology / Q000378:metabolism; D015672:Erythroid Precursor Cells / Q000166:cytology / Q000378:metabolism; D015870:Gene Expression / Q000235:genetics; D005914:Globins / Q000235:genetics; D006657:Histones / Q000235:genetics / Q000378:metabolism; D019901:Locus Control Region / Q000235:genetics; D018741:Replication Origin / Q000235:genetics*
D002843:Chromatin; D006657:Histones; D005914:Globins