Ina Herrmann1, Keith E Linder2, Kathryn M Meurs1, Steven G Friedenberg3, Jonah Cullen3, Natasha Olby1, Petra Bizikova1. 1. Departments of, Department of, Clinical Sciences, College of Veterinary Medicine, NC State University, Raleigh, NC, 27607, USA. 2. Department of, Population Health and Pathobiology, College of Veterinary Medicine, NC State University, Raleigh, NC, 27607, USA. 3. Department of, Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, 55108, USA.
Abstract
BACKGROUND: Junctional epidermolysis bullosa (JEB) is a group of congenital blistering skin diseases characterized by clefting through the lamina lucida of the basement membrane zone. OBJECTIVES: To characterize the clinical and morphological features of a congenital mechanobullous disease in a litter of puppies with severe upper respiratory involvement, and to identify an associated genetic variant. ANIMALS: Five of eight puppies in an Australian cattle dog cross-bred litter showed signs of skin fragility. Three were stillborn and one died at one month of age. The two surviving puppies were presented with blistering skin disease and severe respiratory distress. Additionally, one unaffected sibling was examined and blood was obtained for genetic testing. METHODS AND MATERIALS: Post-mortem examination, histopathological evaluation and electron microscopy were performed. Whole genome sequencing (WGS) of one affected puppy was compared to a database of 522 dogs of 55 different breeds for variant analysis. Sanger sequencing of one additional affected and one unaffected sibling confirmed the variant. RESULTS: Clinically, severe mucocutaneous ulcers occurred in frictional areas with claw sloughing. Histopathological results revealed subepidermal clefts and electron microscopy confirmed the split in the lamina lucida. Post-mortem examination documented extensive pharyngeal and laryngeal lesions with granulation tissue and fibrinous exudate obscuring the airway. Moderate tracheal hypoplasia contributed. The WGS revealed a novel missense variant in the laminin α3-chain XP_537297.2p(Asp2867Val), with an autosomal recessive mode of inheritance. CONCLUSIONS AND CLINICAL RELEVANCE: A novel variant in LAMA3 caused a generalized and severe phenotype of JEB with an unique clinical presentation of upper airway obstruction.
BACKGROUND: Junctional epidermolysis bullosa (JEB) is a group of congenital blistering skin diseases characterized by clefting through the lamina lucida of the basement membrane zone. OBJECTIVES: To characterize the clinical and morphological features of a congenital mechanobullous disease in a litter of puppies with severe upper respiratory involvement, and to identify an associated genetic variant. ANIMALS: Five of eight puppies in an Australian cattle dog cross-bred litter showed signs of skin fragility. Three were stillborn and one died at one month of age. The two surviving puppies were presented with blistering skin disease and severe respiratory distress. Additionally, one unaffected sibling was examined and blood was obtained for genetic testing. METHODS AND MATERIALS: Post-mortem examination, histopathological evaluation and electron microscopy were performed. Whole genome sequencing (WGS) of one affected puppy was compared to a database of 522 dogs of 55 different breeds for variant analysis. Sanger sequencing of one additional affected and one unaffected sibling confirmed the variant. RESULTS: Clinically, severe mucocutaneous ulcers occurred in frictional areas with claw sloughing. Histopathological results revealed subepidermal clefts and electron microscopy confirmed the split in the lamina lucida. Post-mortem examination documented extensive pharyngeal and laryngeal lesions with granulation tissue and fibrinous exudate obscuring the airway. Moderate tracheal hypoplasia contributed. The WGS revealed a novel missense variant in the laminin α3-chain XP_537297.2p(Asp2867Val), with an autosomal recessive mode of inheritance. CONCLUSIONS AND CLINICAL RELEVANCE: A novel variant in LAMA3 caused a generalized and severe phenotype of JEB with an unique clinical presentation of upper airway obstruction.
Authors: W H Irwin McLean; Alan D Irvine; Kevin J Hamill; Neil V Whittock; Carrie M Coleman-Campbell; Jemima E Mellerio; Gabrielle S Ashton; Patricia J H Dopping-Hepenstal; Robin A J Eady; Tanvir Jamil; Roderic J Phillips; S Ghulam Shabbir; Tahir S Haroon; Khawar Khurshid; Jonathan E Moore; Brian Page; Jonathan Darling; David J Atherton; Maurice A M Van Steensel; Colin S Munro; Frances J D Smith; John A McGrath; Rodney J Phillips Journal: Hum Mol Genet Date: 2003-07-15 Impact factor: 6.150
Authors: Ajoy Bardhan; Leena Bruckner-Tuderman; Iain L C Chapple; Jo-David Fine; Natasha Harper; Cristina Has; Thomas M Magin; M Peter Marinkovich; John F Marshall; John A McGrath; Jemima E Mellerio; Rex Polson; Adrian H Heagerty Journal: Nat Rev Dis Primers Date: 2020-09-24 Impact factor: 52.329
Authors: Jun Ishihara; Ako Ishihara; Kazuto Fukunaga; Koichi Sasaki; Michael J V White; Priscilla S Briquez; Jeffrey A Hubbell Journal: Nat Commun Date: 2018-06-04 Impact factor: 14.919