Differential effects of RASA3 mutations on hematopoiesis are profoundly influenced by genetic background and molecular variant.

Abstract:

:Studies of the severely pancytopenic scat mouse model first demonstrated the crucial role of RASA3, a dual RAS and RAP GTPase activating protein (GAP), in hematopoiesis. RASA3 is required for survival in utero; germline deletion is lethal at E12.5-13.5 due to severe hemorrhage. Here, conditional deletion in hematopoietic stem and progenitor cells (HSPCs) using Vav-iCre recapitulates the null phenotype demonstrating that RASA3 is required at the stem and progenitor level to maintain blood vessel development and integrity and effective blood production. In adults, bone marrow blood cell production and spleen stress erythropoiesis are suppressed significantly upon induction of RASA3 deficiency, leading to pancytopenia and death within two weeks. Notably, RASA3 missense mutations in two mouse models, scat (G125V) and hlb381 (H794L), show dramatically different hematopoietic consequences specific to both genetic background and molecular variant. The mutation effect is mediated at least in part by differential effects on RAS and RAP activation. In addition, we show that the role of RASA3 is conserved during human terminal erythropoiesis, highlighting a potential function for the RASA3-RAS axis in disordered erythropoiesis in humans. Finally, global transcriptomic studies in scat suggest potential targets to ameliorate disease progression.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Robledo RF,Ciciotte SL,Graber JH,Zhao Y,Lambert AJ,Gwynn B,Maki NJ,Brindley EC,Hartman E,Blanc L,Peters LL

doi

10.1371/journal.pgen.1008857

subject

Has Abstract

pub_date

2020-12-28 00:00:00

pages

e1008857

issue

12

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-20-00735

journal_volume

16

pub_type

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