Publications by authors named "Landry E Nfonsam"

Newborn screening identified a Chinese-Canadian infant who was positive for possible β-thalassemia (β-thal). Detailed family studies demonstrated that the proband was a compound heterozygote for the Chinese γ(γδβ)-thal deletion and a novel frameshift mutation within exon 3 (:c.336dup), and heterozygous for the Southeast Asian α-thal deletion (--/αα).

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We report two hemoglobinopathy cases involving a novel β-thalassemia (β-thal) nonsense mutation, c.199A > T. One patient had Hb S/β-thal, and a second unrelated patient had Hb D-Punjab/β-thal.

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We report a case of Hb S/β-thalassemia (Hb S/β-thal) in a patient who is a compound heterozygote for the Hb Sickle mutation (:c.20A > T) and a mutation of the canonical splice acceptor sequence of IVS1 (AG > TG, :c.93-2A > T).

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Article Synopsis
  • * A case study of an immunocompromised patient with Hodgkin's lymphoma revealed they were infected with three different COVID-19 lineages over time, starting with B.1.1.176 and later experiencing coinfection with BA.1 before ultimately developing BA.2.9.
  • * The study emphasizes the complexity of tracking COVID-19 lineages in immunocompromised patients and highlights the need for careful analysis to accurately identify viral strains in cases of chronic infection and reinfection.
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Accurate and consistent interpretation of sequence variants is integral to the delivery of safe and reliable diagnostic genetic services. To standardize the interpretation process, in 2015, the American College of Medical Genetics and Genomics (ACMG) and the Association for Molecular Pathology (AMP) published a joint guideline based on a set of shared standards for the classification of variants in Mendelian diseases. The generality of these standards and their subjective interpretation between laboratories has prompted efforts to reduce discordance of variant classifications, with a focus on the expert specification of the ACMG/AMP guidelines for individual genes or diseases.

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Background: Colon cancer is among the most commonly diagnosed cancers in the United States with an estimated 97220 new cases expected by the end of 2018. It affects 1.2 million people around the world and is responsible for about 0.

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Background: About 1.2 million new cases of colon cancer (CC) and 0.6 million deaths are reported every year, establishing CC as an important contributor to worldwide cancer morbidity and mortality.

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Tissue-specific transcription factors are thought to cooperate with signaling pathways to promote patterned tissue specification, in part by co-regulating transcription. The Drosophila melanogaster Pax6 homolog Eyeless forms a complex, incompletely understood regulatory network with the Hedgehog, Decapentaplegic and Notch signaling pathways to control eye-specific gene expression. We report a combinatorial approach, including mRNAseq and microarray analyses, to identify targets co-regulated by Eyeless and Hedgehog, Decapentaplegic or Notch.

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African tick-bite fever is an emerging infectious disease caused by the spotted fever group Rickettsia, Rickettsia africae, and is transmitted by ticks of the genus Amblyomma. To determine the seroprevalence of exposure to R. africae and risk factors associated with infection, we conducted a cross-sectional study of persons in seven rural villages in distinct ecological habitats of Cameroon.

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