English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Hematopoietic stem cells (HSCs) are responsible for sustaining hematopoietic homeostasis and regeneration after injury for the entire lifespan of an organism. Maintenance of genomic stability is crucial for the preservation of HSCs, which depends on their efficient repair of DNA damage, particularly DNA double strand breaks (DSBs). Because of the paucity of HSCs and lack of sensitive assays, directly measuring the ability of HSCs to repair DSBs has been difficult. Therefore, we developed a sensitive and quantitative cell free  in vitro  non-homologous end joining (NHEJ) assay using linearized plasmids as the substrates and quantitative polymerase chain reaction (qPCR) technique. This assay can sensitively detect DSB repair via NHEJ in less than 1 µg 293T cell nuclear proteins or nuclear extracts from about 5,000 to 10,000 human BM CD34 +  hematopoietic cells. Using this assay, we confirmed that human bone marrow HSCs (CD34 + CD38 −  cells) are less proficient in the repair of DSBs by NHEJ than HPCs (CD34 + CD38 +  cells). In contrast, mouse quiescent HSCs (Pyronin-Y low  LKS +  cells) and cycling HSCs (Pyronin-Y hi  LKS +  cells) repaired the damage more efficiently than HPCs (LKS −  cells). The difference in the abilities of human and mouse HSCs and HPCs to repair DSBs through NHEJ is likely attributed to their differential expression of key NHEJ DNA damage repair genes such as  LIG4 . These findings suggest that the qPCR-based cell free  in vitro  NHEJ assay can be used to sensitively measure the ability of human and mouse HSCs to repair DSBs.

A Sensitive and Quantitative Polymerase Chain Reaction-Based Cell Free In Vitro Non-Homologous End Joining Assay for Hematopoietic Stem Cells