A rare transthyretin mutation (Asp18Glu) associated with cardiomyopathy

Lawreen Heller Connors, Taro Yamashita, Masahide Yazaki, Martha Skinner, Merrill D. Benson

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The identification of a rare transthyretin (TTR) gene mutation (Asp18Glu) in a middle-aged male with biopsy proven amyloid disease featuring cardiomyopathy is described. The more commonly occurring light chain amyloidosis (AL) was initially considered, but negative hematologic testing prompted screening for a pathologic TTR mutation. A differential diagnosis of familial transthyretin type amyloidosis (ATTR) was established using a combination of molecular genetic and biochemical techniques. Single-strand conformation polymorphism (SSCP) screening of exons 2, 3 and 4 of the TTR gene indicated the presence of atypical DNA. SSCP testing was performed using a new non-radioactive, silver stained minigel technique. The genetic abnormality was identified by direct DNA sequence analysis as a T to A transversion at the third base position in codon 18. This result was confirmed by restriction fragment length polymorphism (RFLP) testing. The presence of the variant protein, TTR Asp18Glu, in serum from the proband was confirmed by mass spectrometric analysis.

Original languageEnglish (US)
Pages (from-to)61-66
Number of pages6
JournalAmyloid
Volume11
Issue number1
DOIs
StatePublished - Mar 1 2004

Keywords

  • Cardiomyapathy
  • Familial amyloidosis
  • Mutation
  • Transthyretin

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Medicine(all)

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