Apr 11, 2020

Molecular characterization of SLC24A5 variants and evaluation of Nitisinone treatment efficacy in a zebrafish model of OCA6

Pigment Cell & Melanoma Research
Sairah YousafZubair M Ahmed

Abstract

Skin pigmentation is a highly heterogeneous trait with diverse consequences worldwide. SLC24A5, encoding a potent K+ -dependent Na+ /Ca2+ exchanger, is among the known color-coding genes that participate in melanogenesis by maintaining pH in melanosomes. Deficient SLC24A5 activity results in oculocutaneous albinism (OCA) type 6 in humans. In this study, by utilizing a exome sequencing (ES) approach, we identified two new variants [p. (Gly110Arg) and p. (IIe189Ilefs*1)] of SLC24A5 cosegregating with the OCA phenotype, including nystagmus, strabismus, foveal hypoplasia, albinotic fundus and vision impairment, in three large consanguineous Pakistani families. Both of these variants failed to rescue the pigmentation in zebrafish slc24a5 morphants, confirming the pathogenic effects of the variants. We also phenotypically characterized a commercially available zebrafish mutant line (slc24a5ko ) that harbors a nonsense (p.Tyr208*) allele of slc24a5. Similar to morphants, homozygous slc24a5ko mutants had significantly reduced melanin content and pigmentation. Next, we used these slc24a5ko zebrafish mutants to test the efficacy of nitisinone, a compound known to increase ocular and fur pigmentation in OCA1 (TYR)-mutant mice. Treatment o...Continue Reading

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Mentioned in this Paper

Potassium Ion
Embryo
Laboratory mice
Structure of Fovea Centralis
Severe Visual Impairment
TYR
TYR gene
Rats, Mutant Strains
Albinism, Oculocutaneous
Mutant

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