UTSUGISAWA Taiju    Department   School of Medicine(Tokyo Women's Medical University Hospital), School of Medicine    Position   Associate Professor
Article types	Original article
Language	English
Peer review	Peer reviewed
Title	Deficiency of ribosomal protein S19 in CD34+ cells generated by siRNA blocks erythroid development and mimics defects seen in Diamond-Blackfan anemia.
Journal	Formal name：Blood Abbreviation：Blood ISSN code：00064971/00064971
Domestic / Foregin	Foregin
Volume, Issue, Page	105(12),pp.4627-34
Author and coauthor	Flygare Johan, Kiefer Thomas, Miyake Koichi, Utsugisawa Taiju, Hamaguchi Isao, Da Costa Lydie, Richter Johan, Davey Edward J, Matsson Hans, Dahl Niklas, Wiznerowicz Maciej, Trono Didier, Karlsson Stefan
Publication date	2005/06
Summary	Diamond-Blackfan anemia (DBA) is a congenital red cell aplasia in which 25% of the patients have a mutation in the ribosomal protein S19 (RPS19) gene. To study effects of RPS19 deficiency in hematopoiesis we transduced CD34(+) umbilical cord blood (CB) and bone marrow (BM) cells with 3 lentiviral vectors expressing small interfering RNA (siRNA) against RPS19 and 1 scrambled control vector. All vectors also express green fluorescent protein (GFP). Transduction with the siRNA vectors reduced RPS19 mRNA levels to various degrees, which resulted in erythroid defects, correlating to the degree of RPS19 down-regulation, and was rescued by expression of an siRNA-resistant RPS19 transcript. Erythroid colony formation capacity conjointly decreased with RPS19 levels in CD34(+) CB and BM cells. In liquid culture supporting erythroid differentiation, RPS19-silenced as well as DBA patient CD34(+) cells exhibited reduced proliferative capacity and impaired erythroid differentiation resulting in fewer erythroid colony-forming units (CFU-Es). When assaying myeloid development, a less pronounced influence on proliferation was seen. This study shows for the first time that RPS19 silencing decreases the proliferative capacity of hematopoietic progenitors and leads to a defect in erythroid development.
DOI	10.1182/blood-2004-08-3115
PMID	15626736