objective of the present study was to recruit congenital
families of oculocutaneous albinism (OCA) and mutations in TYR and OCA2
genes are identified, which is further expanding the mutation spectrum in this
consanguineous families with OCA were recruited and whole blood was collected.
Clinical examination was carried out to determine the visual acuity and related
eye, skin and hair examinations. Genomic DNA was extracted by standard phenol-chloroform
method. Targeted exome sequencing by TruSight one sequencing panel sequencing was
carried out. Sanger sequencing was performed for mutation detection in tyrosinase
(TYR) and the OCA2 genes and co-segregation in OCA families.
the affected individuals of two OCA families showed clinical characteristics
including white to pale skin, white or blonde hairs, irritant to light,
nystagmus and reduced vision. DNA sequencing showed the genetic mutation of TYR
and OCA2 genes in two OCA families. In family 1, the nucleotide variant (c.1255G>A; p.Gly419Arg) was detected inTYR gene, while in another
family, the splice-site
variant c.1045-15T>G was identified in OCA2.
Conclusion: This study
concluded that identification of TYR and OCA2 mutations in OCA
disease are commonly associated with the population where the consanguinity is
persistent. These findings expanded the molecular basis of oculocutaneous
albinism in Pakistani families and established the mode of genetic counselling
and for diagnostic outcome.
families; Oculocutaneous albinism (OCA); mutations; tyrosinase (TYR); OCA2