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Browsing by Author "Björnsson, Hans Tómas"

Browsing by Author "Björnsson, Hans Tómas"

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  • Högnason, Hákon Björn; Stefánsdóttir, Vigdís Fjóla; Þórólfsdóttir, Eirný Þöll; Jónsson, Jón Jóhannes; Björnsson, Hans Tómas (2022-01-04)
    INNGANGUR Formleg erfðaráðgjafareining hefur verið starfrækt á Landspítala við Hringbraut frá árinu 2006. Samhliða hefur áhugi og þörf á erfðalæknisfræði í almennri heilbrigðisþjónustu aukist til muna. Í þessari grein er starfsemi og útkoma erfðarannsókna ...
  • Faundes, Víctor; Goh, Stephanie; Akilapa, Rhoda; Bezuidenhout, Heidre; Björnsson, Hans Tómas; Bradley, Lisa; Brady, Angela F.; Brischoux-Boucher, Elise; Brunner, Han; Bulk, Saskia; Canham, Natalie; Cody, Declan; Dentici, Maria Lisa; Digilio, Maria Cristina; Elmslie, Frances; Fry, Andrew E.; Gill, Harinder; Hurst, Jane; Johnson, Diana; Julia, Sophie; Lachlan, Katherine; Lebel, Robert Roger; Byler, Melissa; Gershon, Eric; Lemire, Edmond; Gnazzo, Maria; Lepri, Francesca Romana; Marchese, Antonia; McEntagart, Meriel; McGaughran, Julie; Mizuno, Seiji; Okamoto, Nobuhiko; Rieubland, Claudine; Rodgers, Jonathan; Sasaki, Erina; Scalais, Emmanuel; Scurr, Ingrid; Suri, Mohnish; van der Burgt, Ineke; Matsumoto, Naomichi; Miyake, Noriko; Benoit, Valérie; Lederer, Damien; Banka, Siddharth (2021-07)
    Purpose: The variant spectrum and the phenotype of X-linked Kabuki syndrome type 2 (KS2) are poorly understood. Methods: Genetic and clinical details of new and published individuals with pathogenic KDM6A variants were compiled and analyzed. Results: ...
  • Agnarsdóttir, Dagbjört; Sigurjónsdóttir, Vaka Kristín; Emilsdóttir, Arna Rut; Petersen, Erna; Sigfússon, Gunnlaugur; Rögnvaldsson, Ingólfur; Franzson, Leifur; Vernon, Hilary; Björnsson, Hans Tómas (2022-06-16)
    Background: Cardiomyopathy is a known complication of organic acidemias but generally thought to be secondary to poor metabolic control. Methods: Our patient was found through biochemical testing and Sanger sequencing to harbor an Icelandic founder ...
  • Harris, Jacqueline R.; Gao, Christine W.; Britton, Jacquelyn F.; Applegate, Carolyn D.; Björnsson, Hans Tómas; Fahrner, Jill A. (2023-03-23)
    The multidisciplinary Epigenetics and Chromatin Clinic at Johns Hopkins provides comprehensive medical care for individuals with rare disorders that involve disrupted epigenetics. Initially centered on classical imprinting disorders, the focus shifted ...
  • Luperchio, Teresa Romeo; Applegate, Carolyn D.; Bodamer, Olaf; Björnsson, Hans Tómas (2020-02-01)
  • Ng, Rowena; Harris, Jacqueline R.; Fahrner, Jill A.; Björnsson, Hans Tómas (2023-06)
    OBJECTIVES: Wiedemann-Steiner syndrome (WSS) is a rare Mendelian disorder of the epigenetic machinery caused by heterozygous pathogenic variants in KMT2A. Currently, the specific neurocognitive profile of this syndrome remains unknown. This case series ...
  • Zhang, Li; Pilarowski, Genay; Pich, Emilio Merlo; Nakatani, Atsushi; Dunlop, John; Baba, Rina; Matsuda, Satoru; Daini, Masaki; Hattori, Yasushi; Matsumoto, Shigemitsu; Ito, Mitsuhiro; Kimura, Haruhide; Björnsson, Hans Tómas (2021-03-12)
    Kabuki syndrome (KS) is a rare cause of intellectual disability primarily caused by loss-of-function mutations in lysine-specific methyltransferase 2D ( KMT2D), which normally adds methyl marks to lysine 4 on histone 3. Previous studies have shown that ...
  • Reynisdóttir, Tinna; Anderson, Kimberley Jade; Boukas, Leandros; Björnsson, Hans Tómas (2022-06-21)
    Wiedemann-Steiner syndrome (WDSTS) is a neurodevelopmental disorder caused by de novo variants in KMT2A, which encodes a multi-domain histone methyltransferase. To gain insight into the currently unknown pathogenesis of WDSTS, we examined the spatial ...
  • Kalinousky, Allison; Rapp, Tyler; Hijazi, Hadia; Johnson, Jennifer; Björnsson, Hans Tómas; Harris, Jacqueline R. (2022-10-06)
    Kabuki syndrome (KS) is a Mendelian Disorder of the Epigenetic Machinery (MDEM) caused by loss of function variants in either of two genes involved in the regulation of histone methylation, KMT2D (34–76%) or KDM6A (9–13%). Previously, representative ...
  • Theodore-Oklota, Christina; Hartman, Deborah S.; Hoffman, Deborah L.; Björnsson, Hans Tómas (2022-01)
    Introduction: Kabuki syndrome is a rare congenital condition characterized clinically by unique facial features, abnormalities in the skeleton, finger pad abnormalities, and developmental delays, as well as a range of other health issues. Existing ...
  • Fridriksdottir, Run; Jónsson, Arnar Jan; Jensson, Brynjar O.; Sverrisson, Kristinn O.; Arnadottir, Gudny A.; Skarphéðinsdóttir, Sigurbjorg J.; Katrinardottir, Hildigunnur; Snaebjornsdottir, Steinunn; Jonsson, Hakon; Eiriksson, Ogmundur; Óskarsson, Guðjón Reykdal; Oddsson, Asmundur; Jonasdottir, Adalbjorg; Jonasdottir, Aslaug; Sigurdsson, Gisli H.; Indridason, Einar P.; Sigurðsson, Stefán B.; Bjornsdottir, Gyda; Saemundsdottir, Jona; Magnusson, Olafur T.; Björnsson, Hans Tómas; Thorsteinsdottir, Unnur; Sigurdsson, Theodor S.; Sulem, Patrick; Sigurðsson, Martin Ingi; Stefansson, Kari (2021-08-31)
    Malignant hyperthermia (MH) susceptibility is a rare life-threatening disorder that occurs upon exposure to a triggering agent. MH is commonly due to protein-altering variants in RYR1 and CACNA1S. The American College of Medical Genetics and Genomics ...
  • Ng, Rowena; Björnsson, Hans Tómas; Fahrner, Jill A.; Harris, Jacqueline R. (2022-10-13)
    Wiedemann-Steiner syndrome (WSS) is a rare genetic disorder caused by mutation in KMT2A and characterized by neurodevelopmental delay. This study is the first prospective investigation to examine the sleep and behavioral phenotypes among those with WSS ...
  • Ng, R.; Björnsson, Hans Tómas; Fahrner, Jill A.; Harris, Jacqueline R. (2023-02)
    BACKGROUND: Wiedemann-Steiner syndrome (WSS) is a rare genetic disorder caused by heterozygous variants in KMT2A. To date, the cognitive profile associated with WSS remains largely unknown, although emergent case series implicate increased risk of ...
  • Zheng, Shijie C.; Stein-O’Brien, Genevieve; Augustin, Jonathan J.; Slosberg, Jared; Carosso, Giovanni A.; Winer, Briana; Shin, Gloria; Björnsson, Hans Tómas; Goff, Loyal A.; Hansen, Kasper D. (2022-01-31)
    Background: The cell cycle is a highly conserved, continuous process which controls faithful replication and division of cells. Single-cell technologies have enabled increasingly precise measurements of the cell cycle both as a biological process of ...
  • Koenig, Mary Kay; Russo, Sam Nick; McBride, Kim L.; Björnsson, Hans Tómas; Gunnarsdottir, Brynja Bjork; Goldstein, Amy; Falk, Scott A. (2023-01)
    Several mitochondrial diseases are caused by pathogenic variants that impair membrane phospholipid remodeling, with no FDA-approved therapies. Elamipretide targets the inner mitochondrial membrane where it binds to cardiolipin, resulting in improved ...