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Megakaryocytes (MK) generate platelets. Recently, we and others, have reported MK also regulate hematopoietic stem cells (HSC). Here we show high ploidy large cytoplasmic megakaryocytes (LCM) are critical negative regulators of HSC and critical for platelet formation. Using a mouse knockout model (Pf4-Srsf3) with normal MK numbers, but essentially devoid of LCM, we demonstrate a pronounced increase in BM HSC concurrent with endogenous mobilization and extramedullary hematopoiesis. Severe thrombocytopenia is observed in animals with diminished LCM, although there is no change in MK ploidy distribution, uncoupling endoreduplication and platelet production. When HSC isolated from a microenvironment essentially devoid of LCM reconstitute hematopoiesis in lethally irradiated mice, the absence of LCM increases HSC in BM, blood and spleen, and the recapitulation of thrombocytopenia. In contrast, following a competitive transplant using minimal numbers of WT HSC together with HSC from a microenvironment with diminished LCM, sufficient WT HSC-generated LCM regulates a normal HSC pool and prevents thrombocytopenia. Importantly, LCM are conserved in humans.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10102126 | PMC |
http://dx.doi.org/10.1038/s41467-023-37780-7 | DOI Listing |
Hum Reprod
December 2024
IVIRMA Global Research Alliance, IVI Foundation, Health Research Institute La Fe, Valencia, Spain.
Study Question: Is it possible to predict an euploid chromosomal constitution and identify a transcriptomic profile compatible with extended embryonic development from RNA sequencing (RNA-Seq) data?
Summary Answer: It has been possible to obtain a karyotype comparable to preimplantation genetic testing for aneuploidy (PGT-A), in addition to a transcriptomic signature of embryos which might be suggestive of improved implantation capacity.
What Is Known Already: Conventional assessment of embryo competence, based on morphology and morphokinetic, lacks knowledge of molecular aspects and faces controversy in predicting ploidy status. Understanding the embryonic transcriptome is crucial, as gene expression influences development and implantation.
Bot Stud
December 2024
Plant Biosystematics and Ecology RG, Department of Botany, Faculty of Science, Palacky University, Šlechtitelů 11, 779 00, Olomouc, Czech Republic.
Background: The genus Allium is known for its high chromosomal variability, but most chromosome counts are based on a few individuals and genome size (GS) reports are limited in certain taxonomic groups. This is evident in the Allium sect. Codonoprasum, a species-rich (> 150 species) and taxonomically complex section with weak morphological differences between taxa, the presence of polyploidy and frequent misidentification of taxa.
View Article and Find Full Text PDFJ Fish Dis
December 2024
Key Laboratory of Fishery Drug Development, Ministry of Agriculture and Rural Affairs, Guangdong Provincial Key Laboratory of Aquatic Animal Immunology and Sustainable Aquaculture, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China.
Largemouth bass (Micropterus salmoides), a freshwater fish species, is cultivated widely across China. The industry has been greatly affected by various viral diseases. We generated a new immortal cell line from the fin of M.
View Article and Find Full Text PDFAlgal Res
June 2024
Dipartimento di Biotecnologie, Università di Verona, Strada Le Grazie 15, 37134 Verona, Italy.
The green alga (formerly ) is a primary source of astaxanthin, a ketocarotenoid with high antioxidant activity and several industrial applications. Here, the highly repetitive genome was reconstructed by exploiting next-generation sequencing integrated with Hi-C scaffolding, obtaining a 151 Mb genome assembly in 32 scaffolds at a near-chromosome level with high continuity. Surprisingly, the distribution of the single-nucleotide-polymorphisms identified demonstrates a diploid configuration for the genome, further validated by Sanger sequencing of heterozygous regions.
View Article and Find Full Text PDFBMC Med Genomics
December 2024
Department of Pediatrics, Sichuan Provincial Woman's and Children's Hospital, The Affiliated Women's and Children's Hospital of Chengdu Medical College, Chengdu, China.
Background: Pure partial trisomy 16q12.1q22.1 is a rare chromosome copy number variant (CNV).
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!