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26.12.2018 | Genetics | Ausgabe 3/2019

Graefe's Archive for Clinical and Experimental Ophthalmology 3/2019

Identification of novel PROM1 mutations responsible for autosomal recessive maculopathy with rod-cone dystrophy

Zeitschrift:
Graefe's Archive for Clinical and Experimental Ophthalmology > Ausgabe 3/2019
Autoren:
Jian Liang, Xiangjun She, Jieqiong Chen, Yuanqi Zhai, Yang Liu, Kairong Zheng, Yuanyuan Gong, Hong Zhu, Xueting Luo, Xiaodong Sun
Wichtige Hinweise
Jian Liang, Xiangjun She and Jieqiong Chen contributed equally to this work.

Abstract

Purpose

To characterize two patients with macular and rod-cone dystrophy and identify the genetic basis for disease.

Method

Ophthalmic examinations were performed for the family and the peripheral blood samples were collected for whole exome sequencing. The mutated sequences of PROM1 gene were cloned and expressed in cultured cell lines after transient transfection followed by analysis with confocal microscopy and bridge-PCR.

Result

We reported that two patients, brothers in a family, were diagnosed with macular and rod-cone dystrophy. Phenotypically, both patients experience progressive visual impairment and nyctalopia. The fundus examination showed macular and choroid dystrophy with pigment deposits in the macular region. Functionally, photoreceptor response to electrophysiological stimulation was significantly compromised with more severe decline in rods. Genetic analysis by whole exome sequencing revealed two novel compound heterogeneous point mutations in PROM1 gene that co-segregate with patients in an autosomal recessive manner. Specifically, the c.C1902G(p.Y634X) nonsense mutation results in a truncated, labile, and mislocalized protein, while the c.C1682+3A>G intronic mutation disrupts messenger RNA splicing.

Conclusion

Our findings have identified two novel deleterious mutations in PROM1 gene that are associated with hereditary macular and rod-cone dystrophy in human.

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Literatur
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