Nine novel <Emphasis Type="Italic">COL4A3</Emphasis> and <Emphasis Type="Italic">COL4A4</Emphasis> mutations and polymorphisms identified in inherited membrane diseases |
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Authors: | Kesha Rana Stephen Tonna Yan Yan Wang Lydia Sin Tina Lin Elizabeth Shaw Ishanee Mookerjee Judy Savige |
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Institution: | (1) Department of Medicine (AH/NH), The Northern Hospital, University of Melbourne, Epping, VIC, 3076, Australia |
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Abstract: | Both thin basement membrane nephropathy (TBMN) and autosomal recessive Alport syndrome result from mutations in the COL4A3 and COL4A4 genes, and this study documents further mutations and polymorphisms in these genes.
Thirteen unrelated children with TBMN and five individuals with autosomal recessive Alport syndrome were examined for mutations
in the 52 exons of COL4A3 and the 47 coding exons of COL4A4 using single-stranded conformation polymorphism (SSCP) analysis. Amplicons producing different electrophoretic patterns were
sequenced, and mutations were defined as variants that changed an amino acid but were not present in 50 non-hematuric normals.
Three further novel mutations were identified. These were IVS 22-5 T>A in the COL4A3 gene in a consanguineous family with autosomal recessive Alport syndrome, and R1677C and R1682Q in the COL4A4 gene. In addition, six novel polymorphisms (G455G, I462I, G736G and IVS 38-8 G>A in COL4A3, and L658L and A1577A in COL4A4) were demonstrated.
Many different COL4A3 and COL4A4 mutations cause TBMN and autosomal recessive Alport syndrome. The identification of polymorphisms in these genes is particularly
important to enable diagnostic laboratories to distinguish mutations from uncommon normal variants. |
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Keywords: | Alport syndrome Thin basement membrane nephropathy Type IV collagen Inherited disease Glomerular basement membrane |
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