Structural changes to primary visual cortex in the congenital absence of cone input in achromatopsia

Barbara Molz, Anne Herbik, Heidi A. Baseler, Pieter B. de Best, Richard W. Vernon, Noa Raz, Andre D. Gouws, Khazar Ahmadi, Rebecca Lowndes, Rebecca J. McLean, Irene Gottlob, Susanne Kohl, Lars Choritz, John Maguire, Martin Kanowski, Barbara Käsmann-Kellner, Ilse Wieland, Eyal Banin, Netta Levin, Michael B. HoffmannAntony B. Morland*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Autosomal recessive Achromatopsia (ACHM) is a rare inherited disorder associated with dysfunctional cone photoreceptors resulting in a congenital absence of cone input to visual cortex. This might lead to distinct changes in cortical architecture with a negative impact on the success of gene augmentation therapies. To investigate the status of the visual cortex in these patients, we performed a multi-centre study focusing on the cortical structure of regions that normally receive predominantly cone input. Using high-resolution T1-weighted MRI scans and surface-based morphometry, we compared cortical thickness, surface area and grey matter volume in foveal, parafoveal and paracentral representations of primary visual cortex in 15 individuals with ACHM and 42 normally sighted, healthy controls (HC). In ACHM, surface area was reduced in all tested representations, while thickening of the cortex was found highly localized to the most central representation. These results were comparable to more widespread changes in brain structure reported in congenitally blind individuals, suggesting similar developmental processes, i.e., irrespective of the underlying cause and extent of vision loss. The cortical differences we report here could limit the success of treatment of ACHM in adulthood. Interventions earlier in life when cortical structure is not different from normal would likely offer better visual outcomes for those with ACHM.

Original languageAmerican English
Article number102925
JournalNeuroImage: Clinical
Volume33
DOIs
StatePublished - Jan 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021

Keywords

  • Achromatopsia
  • Plasticity
  • Primary visual cortex
  • Surface-based morphology
  • sMRI

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