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Role of extracellular matrix remodelling gene SNPs in keratoconus.

Br J Biomed Sci. 2020 Jan;77(1):13-18. Epub 2019 Aug 29
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摘要


Introduction: Single nucleotide polymorphisms (SNPs) in genes for certain structural components may be implicated in the pathogenesis of keratoconus. We hypothesized links between SNPs in genes coding for collagen, matrix metalloproteinase 9 (MMP9) and tissue inhibitor of matrix metalloproteinase (TIMP) and keratoconus. Furthermore, we hypothesized links between MMP-9 and TIMP-1 SNPs and their tear level in keratoconus patients.Materials and methods: We genotyped 200 keratoconus and 100 control subjects by allele-specific PCR, and quantified MMP-9 and TIMP1 in tear samples by ELISA.Results: COL4A3 (rs55703767) and MMP-9 (rs17576) G alleles were over-represented in keratoconus patients (P < 0.01). TIMP-1 (rs6609533) A allele was more prevalent in keratoconus females (P < 0.01) but not in males (P = 0.73). MMP-9 was higher (P < 0.001) and TIMP1 lower (P < 0.001) in tear samples from keratoconus patients compared to controls. Keratoconus cases carrying MMP-9 (rs17576) homozygous (GG) alleles had higher tear MMP-9 compared to those carrying the (A) allele (P < 0.01). Females carrying TIMP-1 (rs6609533) homozygous (AA) alleles in both groups had significantly lower tear TIMP-1 compared to carriers of the AG and GG genotypes.Conclusions: This study supports the hypothesis of a functional role for COL4A3 (rs55703767, G/T), MMP-9 (rs17576, A/G) and TIMP-1 (rs6609533, A/G) SNPs in the pathogenesis of keratoconus.

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