当前位置： SCI文献检索 > INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE期刊下所有文献 > Hereditary lattice corneal dystrophy is associated with corneal amyloid deposits enclosing C-terminal fragments of keratoepithelin.

Hereditary lattice corneal dystrophy is associated with corneal amyloid deposits enclosing C-terminal fragments of keratoepithelin.

Abstract：

PURPOSE:To investigate the molecular basis of hereditary lattice corneal dystrophy (LCD) type IIIA associated with corneal amyloid deposits afflicting several members of a four-generation family. METHODS:Histologic, immunohistochemical and biochemical studies were performed on corneal tissue samples obtained after perforating keratoplasty. DNA was extracted from peripheral blood leukocytes. All exons of the keratoepithelin-encoding TGFBI gene were amplified and sequenced. The presence of a mutation was confirmed by digestion of the isolated PCR product with the restriction enzyme AlwNI. RESULTS:The cornea of the index patient (II-1) contained large patchy deposits of amyloid, which were immunoreactive for the C terminus of keratoepithelin. Western blot analysis of the polypeptide chains extracted from the amyloid deposits of paraffin-embedded tissue revealed that these represented mainly fragments of the full-length protein. The smallest fragments were 6.5 and 6.9 kDa. DNA analyses of the TGFBI gene revealed a heterozygous T-->C transition at the second position of codon 540 in exon 12, indicating that replacement of phenylalanine by serine (Phe540Ser) leads to dominant disease. The mutation creates a new restriction site for the enzyme AlwNI. Five of the examined family members carried this mutation. Three of them (aged >/=41 years) had the disease, two family members (aged <20 years) do not yet show any clinical symptoms. An additional inconsequential single-nucleotide polymorphism (T1667C) was found at the third position of the same codon (Phe540Phe) in three unaffected family members. CONCLUSIONS:This is the first report of a single-nucleotide mutation at codon 540 of TGFBI leading to LCD, and the first to demonstrate that the amyloid deposits in LCD contain proteolytic fragments of keratoepithelin.

journal_name

Invest Ophthalmol Vis Sci

journal_title

Investigative ophthalmology & visual science

authors

Stix B,Leber M,Bingemer P,Gross C,Rüschoff J,Fändrich M,Schorderet DF,Vorwerk CK,Zacharias M,Roessner A,Röcken C

doi

10.1167/iovs.04-1319

keywords:

subject

Has Abstract

pub_date

2005-04-01 00:00:00

pages

1133-9

issue

eissn

0146-0404

issn

1552-5783

pii

46/4/1133

journal_volume

pub_type

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Hereditary lattice corneal dystrophy is associated with corneal amyloid deposits enclosing C-terminal fragments of keratoepithelin.