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2015, Number 2

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Correo Científico Médico 2015; 19 (2)

Clinical-epidemiological characterization and genetics of a family with chromosome X-linked recessive retinitis pigmentosa

Santana HEE, Tamayo CVJ, Rosado Ruíz-Apodaca I, Márquez IN, Díaz SEC

Language: Spanish
References: 9
Page: 212-221
PDF size: 301.36 Kb.


ABSTRACT

Introduction: retinitis pigmentosa is an inherited disease that affects photoreceptors and pigment epithelium, causing retinal atrophy. Recessive X -linked form is the most severe in the clinical course. This disease is a health problem in our province.
Objective: to characterize epidemiological and clinical genetically a family with chromosome X-linked recessive retinitis pigmentosa.
Methods: a descriptive, retrospective study in 15 individuals, including seven patients and six carriers and two possibly affected, belonging to a family affected with recessive chromosome X-linked retinitis pigmentosa of Urbano Noris municipality, Holguín province was carried out. To participate in the study the patients gave their informed consent for detailed ophthalmological examination, which included visual field, retinal function and genetic study involving making tree to the fourth generation and extraction peripheral blood for DNA analysis by PCR-SSCP ORP-in exon 15 of the RPGR gene, looking for the most frequent mutation.
Results: the age group between 10-19 and 20-29 years predominated with 28.57 % in both cases. The age at onset was early in all patients; vitreous abnormalities predominated in 71.43 %. 42.85 % of the patients was in the final stage of the disease and had no registrable electroretinogram (71.43 %). 60 % of the carriers presented pigment pre-injury in the fundus, tapetal reflection, coinciding with subnormal electroretinograms.
Conclusions: the disease onset was presented early. Vitreous features and no registrable electroretinogram alterations were the most prevailing clinical features. Most patients were in stage IV of the disease. Lesions in the fundus and electroretinograms were present in a high percentage of the affected carriers. Ophthalmic perimeter and electroretinographic alterations of these patients show the characteristics of this type of heritage features. In the molecular genetic study of exon ORP-15 the necessary mutation was not found.


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