Analysis of cDNA sequences of feline SAAs

Maartje Van Rossum, Fons J.A.M. Van Asten, Jaime Rofina, Johannes A. Lenstra, Merrill D. Benson, Erik Gruys

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Feline amyloidosis is an uncommon disorder caused by deposits of amyloid in a variety of organs. Most frequently encountered types are amyloid derived of pancreatic islet amyloid polypeptide (AIAPP) in older cats and of the apolipoprotein, apo-serum amyloid A (AA) in Abyssinian/Somali (Aby) and Siamese/Oriental (Siam) cats occurring at a relatively young age. For the AA protein of the Aby, Siam and domestic shorthair cat (DSH) breed different amino acid sequences have been described. It is not yet clear, however, whether the tendency to develop AA amyloidosis in Aby and Siam is associated with specific apoSAA protein sequences and whether this is breed specific. In this study, DNA from one Siam and two DSH cats revealed on Southern blot three bands suggesting at least three genes or gene clusters. The SAA cDNAs of hepatic mRNA from three Abys, five Siams and five DSHs were amplified by RT-PCR, cloned and sequenced. Siams and Abys had limited SAA sequence variability. All five Siams, three of which were positive for amyloid, had the amyloidogenic Siam SAA and the amyloidogenic Aby SAA sequence. Two of the Abys, both with amyloid, had the amyloidogenic Aby SAA sequence. The third Aby, without amyloid, missed its amyloidogenic sequence. The SAA sequences of the DSHs found in the present preliminary survey, suggested a possible tendency for more variability, whereas the amyloidogenic Siam as well as the amyloidogenic Aby sequence were found once. Up to five different sequences were found in a single animal. All five DSHs, moreover, had a specific sequence lacking in the Siams and Abys. The present results, especially those of the Siams, favor that in addition to the occurrence of amyloid associated SAA genes other factors such as infections and inflammatory processes are involved in the development of phenotypical amyloidosis.

Original languageEnglish (US)
Pages (from-to)38-43
Number of pages6
JournalAmyloid
Volume11
Issue number1
DOIs
StatePublished - Mar 1 2004

Keywords

  • Abyssinian cat
  • Amino acid sequence
  • Domestic shorthair cat
  • Serum amyloid A
  • Siamese cat

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Medicine(all)

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    Van Rossum, M., Van Asten, F. J. A. M., Rofina, J., Lenstra, J. A., Benson, M. D., & Gruys, E. (2004). Analysis of cDNA sequences of feline SAAs. Amyloid, 11(1), 38-43. https://doi.org/10.1080/13506120410001676836