Book overview : [Read by Derek Shetterly]Named one of the top books of 2009 by the Times Literary Supplement (London), this controversial and compelling audiobook from Dr. Stephen C. Meyer presents a convincing new case for intelligent design (ID) based on revolutionary discoveries in science and DNA. Along the way, Meyer argues that Charles Darwin's theory of evolution as expounded in The Origin of Species did not, in fact, refute ID. If you enjoyed Francis Collins's The Language of God, you'll find much to ponder -- about evolution, DNA, and intelligent design -- in Signature in the Cell. e refute intelligent design (ID)? In Signature in the Cell, Stephen Meyer argues that he did not. Much confusion surrounds the theory of intelligent design. Frequently misrepresented by the media, politicians, and local school boards, intelligent design can be defended on purely scientific grounds in accordance with the same rigorous methods that apply to every proposed origin-of-life theory. Signature in the Cell is the first book to make a comprehensive case for intelligent design based upon DNA. Meyer embarks on an odyssey of discovery as he investigates current evolutionary theories and the evidence that ultimately led him to affirm intelligent design. Clearly defining what ID is and is not, Meyer shows that the argument for intelligent design is not based on ignorance or ''giving up on science,'' but instead upon our growing scientific knowledge of the information stored in the cell. A leading proponent of intelligent design in the scientific community, Meyer presents a compelling case that will generate heated debate, command attention, and find new adherents from leading scientists around the world.
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Tumor infiltrating lymphocytes (TILs) have been associated with favorable prognosis in multiple tumor types. The Cancer Genome Atlas (TCGA) represents the largest collection of cancer molecular data, but lacks detailed information about the immune environment. Here, we show that exome reads mapping to the complementarity-determining-region 3 (CDR3) of mature T-cell receptor beta (TCRB) can be used as an immune DNA (iDNA) signature. Specifically, we propose a method to identify CDR3 reads in a breast tumor exome and validate it using deep TCRB sequencing. In 1,078 TCGA breast cancer exomes, the fraction of CDR3 reads was associated with TILs fraction, tumor purity, adaptive immunity gene expression signatures and improved survival in Her2+ patients. Only 2/839 TCRB clonotypes were shared between patients and none associated with a specific HLA allele or somatic driver mutations. The iDNA biomarker enriches the comprehensive dataset collected through TCGA, revealing associations with other molecular features and clinical outcomes.
In breast cancer, the presence of tumor infiltrating lymphocytes (TILs), and more specifically T-lymphocytes, is associated with good survival1,2 and response to neo-adjuvant treatment3,4. The different breast cancer subtypes do not significantly differ in fraction of TILs, which is relatively low5, but this metric has prognostic or predictive value in triple negative breast cancer (TNBC) and Her2+ breast cancer4,6,7. In order to further distinguish the different cell type populations, other studies have used immunohistochemistry to detect cell surface markers (e.g. CD3, CD8, CD20), demonstrating, for example, that the predictive value of B-cell infiltration is independent of cancer subtype or other clinical factors8, or that CD8+ T-cell infiltration is of good prognosis in basal TNBC5. A related clinical-grade assay, the immunoscore, is being proposed for colorectal cancer9, but requires further evaluation in breast cancer3.
Analysis of gene expression signatures can also be used to infer the presence of immune cells and their role in immune signaling within the tumor microenvironment. High levels of a TIL-associated signature is associated with good prognosis in ER- breast cancer10. Gene expression signatures specific to T-cells5,11 and B-cells12 also have prognostic or predictive value in specific cancer subtypes. Interestingly, while the expression of metagenes is not different between breast cancer subtypes, their prognostic significance varies. For example, the expression of a T-cell metagene is associated with good prognosis in ER- or Her2+ tumors11. More recently, the gene expression measurements in heterogeneous tumor samples have been deconvolved using machine learning to determine the relative abundance of up to 22 immune cell types13. This association revealed an opposite survival association of plasma cells and neutrophils14.
Additional studies are needed to fully understand the regional variation of the repertoire and its consequences on cancer progression and response. Nevertheless, the value of TCR repertoire sequencing may be in monitoring the clonal evolution within a patient or tumor rather than in the identification of a broad-spectrum tumor specific antigen or its corresponding T-cell clone.
Blood normal whole-exome sequencing data was downloaded from TCGA for the BRCA cohort. HLA class I types were identified through a consensus approach of three tools: optitype49, athlates50, and snp2hla51. Allele assignments were selected for cases when two or three tools agreed, and when the tools did not agree, alleles were assigned by optitype, as it has the highest reported accuracy49. HLA class II types were identified by merging the results of athlates and snp2hla, since each covered a different subset of the genes.
The manuscript was written by E.L. and O.H. Deep T-cell and tumor exome sequencing was done by B.W. and analyzed by E.L. and O.H. Identification of CDR3 reads in TCGA and data collection was done by E.L., V.G.-C., R.A. and analyzed by E.L. and O.H. HLA haplotypes were called by R.M. and H.C. and analyzed by M.D. R.A. and V.G.C. are employees of Pfizer Chile.
Previous studies showed that mutational signatures in B-cell NHL including B-CLL are often associated with intrinsic abnormalities such as the COSMIC signature 9 due to somatic hypermutation associated with aberrant activation induced cytosine deaminase8. Furthermore, single cell whole genome sequencing studies of B-cells from healthy volunteers suggests that mutational signatures correlate with intrinsic factors including the age associated COSMIC signature 1 due to spontaneous deamination of methylated cytosines as well as COSMIC signature 99. As T-cell lymphomas are not included in TCGA, there have been no comprehensive studies of mutational signatures in T-cell NHL although recent high-throughput sequencing studies have identified putative driver gene mutations targeting specific signalling pathways notably TCR, NF-kB and JAK-STAT signalling10,11,12,13,14. These findings suggest that some T-cell NHL are dependent on TCR signalling analogous to a dependence on BCR signalling in B-cell NHL15.
In order to identify causal factors in T-cell NHL, we performed a systematic review of the literature and identified 14 published WES studies of T-cell NHLs from which mutational data could be combined11,12,13,14,16,17,18,19,20,21,22,23,24,25. Using this dataset of over 400 whole exome sequences we deconvoluted the mutational signatures present in eight different subtypes of mature T-cell lymphomas. Whilst this analysis indicates that all mature T-cell NHLs have age related signatures, distinct signatures are present, including signature 17 associated with HTLV-1 transformed ATLL and UV signature 7 in cutaneous T-cell lymphoma (CTCL). We show that this clonotypic UV signature is present in leukemic T-cells, presumably due to recirculation from skin. These findings have important implications for the pathogenesis of CTCL and suggest that skin resident memory T-cells are susceptible to the mutagenic as well as the immunomodulatory effects of UV.
Since mature T-cell NHLs have not been included in any of the large pan-cancer sequencing projects, we performed a comprehensive review of the literature. 34 studies were identified which included whole exome data from 631 patients. Overall 14 studies comprising 403 patients met our eligibility criteria (Table 1).
There was a striking disparity in the number of exomes sequenced between the subtypes, particularly when compared to the relative incidence of each subtype (Fig. 1). Notably, rare subtypes such as Sezary syndrome (SS) and ATLL account for 45% of the exomes sequenced whilst only representing 4% of mature T-cell NHL cases in the US26. On the other hand, mycosis fungoides (MF) and peripheral T-cell lymphoma (PTCL) account for only 5% of the exomes sequenced whilst representing 45% of mature T-cell NHL cases. This is likely because both SS and ATLL are leukaemic variants facilitating isolation of clonal populations of tumour cells from peripheral blood.
Comparison of the distribution of number of exomes sequenced with the US incidence rate of each subtype. Literature analysis identified 631 whole exome sequences performed on mature T-cell NHL samples. US Incidence rates are derived from the 2016 US lymphoid malignancy statistics26 which estimated 8,380 new cases of mature T-cell NHL in 2016. 2ff7e9595c
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