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"Dick, John"
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Funny Frank
Gertie the hen is appalled when her son Frank wants to swim with the ducks, but Jemima and her mother, the farmer's wife, make him a special outfit so that his dream can come true.
Book
A cellular hierarchy framework for understanding heterogeneity and predicting drug response in acute myeloid leukemia
The treatment landscape of acute myeloid leukemia (AML) is evolving, with promising therapies entering clinical translation, yet patient responses remain heterogeneous, and biomarkers for tailoring treatment are lacking. To understand how disease heterogeneity links with therapy response, we determined the leukemia cell hierarchy makeup from bulk transcriptomes of more than 1,000 patients through deconvolution using single-cell reference profiles of leukemia stem, progenitor and mature cell types. Leukemia hierarchy composition was associated with functional, genomic and clinical properties and converged into four overall classes, spanning Primitive, Mature, GMP and Intermediate. Critically, variation in hierarchy composition along the Primitive versus GMP or Primitive versus Mature axes were associated with response to chemotherapy or drug sensitivity profiles of targeted therapies, respectively. A seven-gene biomarker derived from the Primitive versus Mature axis was associated with response to 105 investigational drugs. Cellular hierarchy composition constitutes a novel framework for understanding disease biology and advancing precision medicine in AML.
A novel gene expression classifier of AML heterogeneity captures patient-specific variation in leukemia cell composition and predicts clinical responses to treatment.
Journal Article
The catlady
Muriel Ponsonby, the Catlady, lives with dozens of cats, many of whom she believes are reincarnated friends, relatives, and even royalty.
Book
Quantitative single-cell proteomics as a tool to characterize cellular hierarchies
Large-scale single-cell analyses are of fundamental importance in order to capture biological heterogeneity within complex cell systems, but have largely been limited to RNA-based technologies. Here we present a comprehensive benchmarked experimental and computational workflow, which establishes global single-cell mass spectrometry-based proteomics as a tool for large-scale single-cell analyses. By exploiting a primary leukemia model system, we demonstrate both through pre-enrichment of cell populations and through a non-enriched unbiased approach that our workflow enables the exploration of cellular heterogeneity within this aberrant developmental hierarchy. Our approach is capable of consistently quantifying ~1000 proteins per cell across thousands of individual cells using limited instrument time. Furthermore, we develop a computational workflow (SCeptre) that effectively normalizes the data, integrates available FACS data and facilitates downstream analysis. The approach presented here lays a foundation for implementing global single-cell proteomics studies across the world.
Single-cell proteomics can provide insights into the molecular basis for cellular heterogeneity. Here, the authors develop a multiplexed single-cell proteomics and computational workflow, and show that their strategy captures the cellular hierarchies in an Acute Myeloid Leukemia culture model.
Journal Article
Titus rules!
Queen Elizabeth's youngest corgi prevents a series of disasters at Windsor Castle and earns the title \"king among dogs.\"
BOOK
Distinct routes of lineage development reshape the human blood hierarchy across ontogeny
In adults, more than 300 billion blood cells are replenished daily. This output arises from a cellular hierarchy where stem cells differentiate into a series of multilineage progenitors, culminating in unilineage progenitors that generate over 10 different mature blood cell types. Notta et al. mapped the lineage potential of nearly 3000 single cells from 33 different cell populations of stem and progenitor cells from fetal liver, cord blood, and adult bone marrow (see the Perspective by Cabezas-Wallscheid and Trumpp). Prenatally, stem cell and progenitor populations were multilineage with few unilineage progenitors. In adults, multilineage cell potential was only seen in stem cell populations. Science , this issue p. 10.1126/science.aab2116 ; see also p. 126 As humans age, progenitor cells take over from stem cells the task of producing a steady supply of blood cells. [Also see Perspective by Cabezas-Wallscheid and Trumpp ] In a classical view of hematopoiesis, the various blood cell lineages arise via a hierarchical scheme starting with multipotent stem cells that become increasingly restricted in their differentiation potential through oligopotent and then unipotent progenitors. We developed a cell-sorting scheme to resolve myeloid (My), erythroid (Er), and megakaryocytic (Mk) fates from single CD34 + cells and then mapped the progenitor hierarchy across human development. Fetal liver contained large numbers of distinct oligopotent progenitors with intermingled My, Er, and Mk fates. However, few oligopotent progenitor intermediates were present in the adult bone marrow. Instead, only two progenitor classes predominate, multipotent and unipotent, with Er-Mk lineages emerging from multipotent cells. The developmental shift to an adult “two-tier” hierarchy challenges current dogma and provides a revised framework to understand normal and disease states of human hematopoiesis.
Journal Article
Looking ahead in cancer stem cell research
The idea that many cancers are organized as hierarchies sustained by cancer stem cells (CSCs) at their apex has generated almost breathless excitement in many quarters of the cancer research community. The history of the stem cell field offers pointers for future research on cancer stem cells.
Journal Article
Absolute Green Lantern/Green Arrow
\"This stunning Absolute Edition of Green Lantern/Green Arrow collect the early 1970s, featuring classic team-ups written by Dennis O'Neil with art by Neal Adams! In these stories, Green Lantern Hal Jordan continued his usual cosmic-spanning adventures, as he used his amazing Power Ring to police Sector 2814 against universe-threatening menaces. Meanwhile, on Earth, Oliver Queen, the archer known as Green Arrow, was confronting menaces of a different kind: racism, poverty, drugs, and other social ills! This Absolute Edition will include additional script and character development pages as well as character sketches\"-- Provided by publisher.
Book
Isolation of Single Human Hematopoietic Stem Cells Capable of Long-Term Multilineage Engraftment
Lifelong blood cell production is dependent on rare hematopoietic stem cells (HSCs) to perpetually replenish mature cells via a series of lineage-restricted intermediates. Investigating the molecular state of HSCs is contingent on the ability to purify HSCs away from transiently engrafting cells. We demonstrated that human HSCs remain infrequent, using current purification strategies based on Thy1 (CD90) expression. By tracking the expression of several adhesion molecules in HSC-enriched subsets, we revealed CD49f as a specific HSC marker. Single CD49f + cells were highly efficient in generating long-term multilineage grafts, and the loss of CD49f expression identified transiently engrafting multipotent progenitors (MPPs). The demarcation of human HSCs and MPPs will enable the investigation of the molecular determinants of HSCs, with a goal of developing stem cell—based therapeutics.
Journal Article