{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T14:07:14Z","timestamp":1770818834601,"version":"3.50.1"},"reference-count":44,"publisher":"American Society of Hematology","issue":"15","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2020,8,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>It is not clear whether disrupted age-specific hematopoiesis contributes to the complex manifestations in leukemia patients who carry identical mutations, particularly in pediatric and adult patients with similar clinical characteristics. By studying a dual-age\u2013specific mouse model, we demonstrate that (1) loss of Pten during the fetal-to-adult hematopoiesis switch (hematopoiesis switch) causes sustained fetal hematopoiesis, resulting in death in juvenile leukemia; (2) myeloid-biased hematopoiesis in juvenile mice is associated with the sustained fetal properties of hematopoietic stem cells (HSCs); (3) the age specificity of juvenile myelomonocytic leukemia depends on the copy number of Pten and Nf1; (4) single-allelic Pten deletion during the hematopoiesis switch causes constitutive activation of MAPK in juvenile mice with Nf1 loss of heterozygosity (LOH); and (5) Nf1 LOH causes monocytosis in juvenile mice with Pten haploinsufficiency but does not cause lethality until adulthood. Our data suggest that 1 copy of Pten is sufficient to maintain an intact negative-feedback loop of the Akt pathway and HSC function in reconstitution, despite MAPK being constitutively activated in juvenile Pten+\/\u0394Nf1LOH mice. However, 2 copies of Pten are required to maintain the integrity of the MAPK pathway in juvenile mice with Nf1 haploinsufficiency. Our data indicate that previous investigations of Pten function in wild-type mice may not reflect the impact of Pten loss in mice with Nf1 mutations or other genetic defects. We provide a proof of concept that disassociated age-specific hematopoiesis contributes to leukemogenesis and pediatric demise.<\/jats:p>","DOI":"10.1182\/bloodadvances.2020002326","type":"journal-article","created":{"date-parts":[[2020,8,10]],"date-time":"2020-08-10T17:52:14Z","timestamp":1597081934000},"page":"3728-3740","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":5,"title":["Sustained fetal hematopoiesis causes juvenile death from leukemia: evidence from a dual-age\u2013specific mouse model"],"prefix":"10.1182","volume":"4","author":[{"given":"Nitza","family":"Vara","sequence":"first","affiliation":[{"name":"Winthrop P. Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuqing","family":"Liu","sequence":"additional","affiliation":[{"name":"Medical Center of Hematology, The Xinqiao Hospital of Army Medical University, Chongqing, China;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan","family":"Yan","sequence":"additional","affiliation":[{"name":"Winthrop P. Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shelly Y.","family":"Lensing","sequence":"additional","affiliation":[{"name":"Winthrop P. 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Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xin","family":"Zhang","sequence":"additional","affiliation":[{"name":"Winthrop P. Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"},{"name":"Department of Pharmacodynamics, College of Pharmacy, University of Florida, Gainesville, FL;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Erich A.","family":"Peterson","sequence":"additional","affiliation":[{"name":"Winthrop P. Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicholas J.","family":"Baltz","sequence":"additional","affiliation":[{"name":"Winthrop P. Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daohong","family":"Zhou","sequence":"additional","affiliation":[{"name":"Winthrop P. Rockefeller Cancer Institute, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR;"},{"name":"Department of Pharmacodynamics, College of Pharmacy, University of Florida, Gainesville, FL;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3729-436X","authenticated-orcid":false,"given":"Alice","family":"Bertaina","sequence":"additional","affiliation":[{"name":"Division of Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, Stanford School of Medicine, Stanford, CA; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"suffix":"Jr","given":"Donald J.","family":"Johann","sequence":"additional","affiliation":[{"name":"Winthrop P. 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