Girón-Ortega M, Morillo Sánchez MJ, Soto-Sierra M, Mena M, Antinolo G, Ramos-Jiménez M, López-Domínguez M, Rodríguez-de-la-Rúa E. Atypical fundoscopic manifestation with good visual prognosis in familial hypomagnesemia with hypercalciuria and nephrocalcinosis.
Ophthalmic Genet 2024:1-5. [PMID:
39206762 DOI:
10.1080/13816810.2024.2390021]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 07/12/2024] [Accepted: 08/02/2024] [Indexed: 09/04/2024]
Abstract
PURPOSE
Pathogenic variants in the CLDN19 gene are responsible for Familial Hypomagnesemia with Hypercalciuria and Nephrocalcinosis (FHHNC) with ocular pathology (MIM *248190). Our objective was to delineate the ophthalmological and genetic manifestations of a patient with FHHNC and a pathogenic variant in CLDN19.
CASE REPORT
A 25-year-old woman presented with renal involvement and a best-corrected visual acuity of 20/25 in the right eye and finger-counting ability in the left eye. The patient exhibited high myopia, convergent strabismus, and chorioretinal atrophic plaques in the perifoveal and peripapillary areas. We conducted a comprehensive ophthalmological examination, including refraction, fundoscopy, color and autofluorescence retinography, optical coherence tomography, and electrophysiology tests. Additionally, next-generation sequencing was performed using Illumina NextSeq500. We identified a homozygous missense variant, c.59G>A p.Gly20Asp, in the CLDN19 gene as the cause of renal and ocular manifestations.
CONCLUSION
FHHNC is associated with various ocular alterations. The unique retinal disorders described in this article suggest a more favorable visual prognosis compared to those previously reported in the literature. Determining the phenotypic diversity of this disease may aid in the diagnosis and management of future cases.
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