Program in Systems Biology; Department of Biochemistry and Molecular Pharmacology
Amino Acids, Peptides, and Proteins | Congenital, Hereditary, and Neonatal Diseases and Abnormalities | Eye Diseases | Genetic Phenomena | Genetics and Genomics | Ophthalmology
Background: Sclerocornea is a rare congenital disorder characterized with the opacification of the cornea. Here, we report a nonconsanguineous Chinese family with multiple peripheral sclerocornea patients spanning across three generations inherited in an autosomal dominant manner.
Methods: This is a retrospective case series of a peripheral sclerocornea pedigree. Comprehensive ophthalmic examinations were conducted and assessed on 14 pedigree members. Whole-exome sequencing was used to identify the genetic alterations in the affected pedigree members. Lymphoblastoid cell lines (LCLs) were established using blood samples from the family members. Functional tests were performed with these cell lines.
Results: Six affected and eight unaffected members of a family with peripheral sclerocornea were examined. All affected individuals showed features of scleralization over the peripheral cornea of both eyes. Mean horizontal and vertical corneal diameter were found significantly decreased in the affected members. Significant differences were also observed on the mean apex pachymetry between affected and unaffected subjects. These ophthalmic parameters did not resemble that of cornea plana. A RAD21(C1348T) variant was identified by whole-exome sequencing. Although this variant causes RAD21 R450C substitution at the separase cleavage site, cells from peripheral sclerocornea family members had no mitosis and ploidy defects.
Conclusion: We report a family of peripheral sclerocornea with no association with cornea plana. A RAD21 variant was found cosegregating with peripheral sclerocornea. Our results suggest that RAD21 functions, other than its cell cycle and chromosome segregation regulations, could underline the pathogenesis of peripheral sclerocornea.
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Copyright © 2019 Bi Ning Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI of Published Version
Dis Markers. 2019 Nov 12;2019:8781524. doi: 10.1155/2019/8781524. eCollection 2019. Link to article on publisher's site
Zhang BN, Chan TC, Tam PO, Liu Y, Pang CP, Jhanji V, Chen LJ, Chu WK. (2019). A Cohesin Subunit Variant Identified from a Peripheral Sclerocornea Pedigree. Open Access Articles. https://doi.org/10.1155/2019/8781524. Retrieved from https://escholarship.umassmed.edu/oapubs/4057
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