Homozygous Deletion of Exons 2-7 Within TGFB3 Gene in a Child With Severe Loeys-Dietz Syndrome and Marfan-like Features

Am J Med Genet A. 2020 May;182(5):1230-1235. doi: 10.1002/ajmg.a.61508. Epub 2020 Feb 5.

Abstract

We describe a patient with palatal abnormalities-cleft palate and bifid uvula; distinctive facial features-long and triangular face, large ears and nose, thin lips and dental crowding; musculoskeletal abnormalities-severe scoliosis, joint laxity, long digits, flat feet, decreased muscle mass, and diminished muscle strength; and cardiac features-a dilatated ascending aorta at the level of Valsalva sinuses and a patent foramen ovale. Sequence analysis and deletion/duplication testing for a panel of genes involved in connective tissue disorders revealed the presence of a novel homozygous deletion of exons 2-7 in TGFB3 gene. Heterozygous pathogenic mutations in TGFB3 have been associated with Loeys-Dietz syndrome 5 (LDS5) and Arrhythmogenic Right Ventricular Dysplasia type 1. Here, we report the first case of a homozygous TGFB3 variant associated with a severe LDS5 and Marfan-like presentation.

Keywords: TGFB3; Loeys-Dietz; Marfan syndrome; dysmorphology; marfanoid habitus; scoliosis.

Publication types

  • Case Reports