Retinal nerve fibre layer thinning and corneal nerve loss in patients with Bardet-Biedl syndrome

BMC Med Genomics. 2023 Nov 23;16(1):301. doi: 10.1186/s12920-023-01739-w.

Abstract

Background: Bardet-Biedl syndrome (BBS) is an autosomal recessive, genetically heterogeneous, pleiotropic disorder caused by variants in genes involved in the function of the primary cilium. We have harnessed genomics to identify BBS and ophthalmic technologies to describe novel features of BBS.

Case presentation: A patient with an unclear diagnosis of syndromic type 2 diabetes mellitus, another affected sibling and unaffected siblings and parents were sequenced using DNA extracted from saliva samples. Corneal confocal microscopy (CCM) and retinal spectral domain optical coherence tomography (SD-OCT) were used to identify novel ophthalmic features in these patients. The two affected individuals had a homozygous variant in C8orf37 (p.Trp185*). SD-OCT and CCM demonstrated a marked and patchy reduction in the retinal nerve fiber layer thickness and loss of corneal nerve fibers, respectively.

Conclusion: This report highlights the use of ophthalmic imaging to identify novel retinal and corneal abnormalities that extend the phenotype of BBS in a patient with syndromic type 2 diabetes.

Keywords: Bardet-Biedl Syndrome; Corneal confocal Microscopy; Nerves; Optical coherence tomography; Retina.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bardet-Biedl Syndrome* / complications
  • Bardet-Biedl Syndrome* / diagnosis
  • Bardet-Biedl Syndrome* / genetics
  • Diabetes Mellitus, Type 2* / complications
  • Diabetes Mellitus, Type 2* / genetics
  • Humans
  • Mutation
  • Nerve Fibers
  • Phenotype
  • Proteins / genetics
  • Retina

Substances

  • C8orf37 protein, human
  • Proteins