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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1998 Feb;62(2):253–261. doi: 10.1086/301703

Topoisomerase I and II consensus sequences in a 17-kb deletion junction of the COL4A5 and COL4A6 genes and immunohistochemical analysis of esophageal leiomyomatosis associated with Alport syndrome.

Y Ueki 1, I Naito 1, T Oohashi 1, M Sugimoto 1, T Seki 1, H Yoshioka 1, Y Sado 1, H Sato 1, T Sawai 1, F Sasaki 1, M Matsuoka 1, S Fukuda 1, Y Ninomiya 1
PMCID: PMC1376880  PMID: 9463311

Abstract

Diffuse esophageal leiomyomatosis (DL), a benign smooth-muscle-cell tumor, is characterized by abnormal cell proliferation. DL is sometimes associated with X-linked Alport syndrome (AS), an inherited nephropathy caused by COL4A5 gene mutations. COL4A5 is tightly linked, in a head-to-head fashion, to the functionally related and coordinately regulated COL4A6 gene. No X-linked AS cases are due to COL4A6 mutations, but all DL/AS cases are always associated with deletions spanning the 5' regions of the COL4A5/COL4A6 cluster. Unlike the COL4A5 breakpoints, those of COL4A6 are clustered within intron 2 of the gene. We identified a DL/AS deletion and the first characterization of the breakpoint sequences. We show that a deletion eliminates the first coding exon of COL4A5 and the first two coding exons of COL4A6. The breakpoints share the same sequence, which, in turn, is closely homologous to the consensus sequences of topoisomerases I and II. Additional DNA evidence suggested that the male patient is a somatic mosaic for the mutation. Immunohistochemical analysis using alpha-chain-specific monoclonal antibodies supported this conclusion, since it revealed the absence of the alpha5(IV) and alpha6(IV) collagen chains in most but not all of the basement membranes of the smooth-muscle-cell tumor. We also documented a similar segmental staining pattern in the glomerular basement membranes of the patient's kidney. This study is particularly relevant to the understanding of DL pathogenesis and its etiology.

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Selected References

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