A new genetic variant of hereditary apolipoprotein A-I amyloidosis: a case-report followed by discussion of diagnostic challenges and therapeutic options View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Myrto Moutafi, Dimitrios C. Ziogas, Spyros Michopoulos, Tina Bagratuni, Vassiliki Vasileiou, Laura Verga, Giampaolo Merlini, Giovanni Palladini, Charis Matsouka, Meletios A. Dimopoulos, Efstathios Kastritis

ABSTRACT

BACKGROUND: Hereditary amyloidosis refers to a wide spectrum of rare diseases with different causative mutations in the genes of various proteins including transthyretin, apolipoprotein AI and AII, gelsolin, lysozyme, cystatin C, fibrinogen Aα-chain, β2-microglobulin, apolipoprotein CII and CIII. CASE PRESENTATION: Among hereditary amyloidosis subtypes, we describe here a specific case of Apolipoprotein AI amyloidosis (AApoAI), where the diagnosis began from an almost asymptomatic hepatomegaly followed by the development of primary hypogonadism. Baseline laboratory tests showed increased liver enzymes, while imaging tests revealed a suspected infiltrative liver disease. Patient underwent into liver biopsy and histological examination detected the presence of periodic acid-Schiff (-) and Congo-red (+) amorphous eosinophilic material within normal liver tissue. In the typing of amyloid by immunoelectron microscopy, the liver appeared heavily infiltrated by anti-apoAI (+) amyloid fibrils. Gene sequencing and mutational analysis revealed a single-base mutation at position c.251 T > C resulting in an amino acid substitution from leucine to proline in the mature ApoAI protein. This amino acid change led to lower cleavage and ApoAI deposition into the involved organs. Few years later, our patient remaining without treatment, came with symptoms consistent with primary hypogonadism but testicular involvement with ApoAI deposits could not be proven since the patient refused testicular biopsy. Based on this case, we recap the diagnostic challenges, the clinical manifestations, and the potential treatment options for this indolent hereditary amyloidosis subtype. CONCLUSIONS: This case-report enlarges the clinical picture of ApoAI-driven disease and its complex genetic background and in parallel suggests for a more systematic approach in any case with strong suspicion of hereditary amyloidosis. More... »

PAGES

23

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12881-019-0755-5

DOI

http://dx.doi.org/10.1186/s12881-019-0755-5

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https://app.dimensions.ai/details/publication/pub.1111576796

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30665372


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29 schema:description BACKGROUND: Hereditary amyloidosis refers to a wide spectrum of rare diseases with different causative mutations in the genes of various proteins including transthyretin, apolipoprotein AI and AII, gelsolin, lysozyme, cystatin C, fibrinogen Aα-chain, β2-microglobulin, apolipoprotein CII and CIII. CASE PRESENTATION: Among hereditary amyloidosis subtypes, we describe here a specific case of Apolipoprotein AI amyloidosis (AApoAI), where the diagnosis began from an almost asymptomatic hepatomegaly followed by the development of primary hypogonadism. Baseline laboratory tests showed increased liver enzymes, while imaging tests revealed a suspected infiltrative liver disease. Patient underwent into liver biopsy and histological examination detected the presence of periodic acid-Schiff (-) and Congo-red (+) amorphous eosinophilic material within normal liver tissue. In the typing of amyloid by immunoelectron microscopy, the liver appeared heavily infiltrated by anti-apoAI (+) amyloid fibrils. Gene sequencing and mutational analysis revealed a single-base mutation at position c.251 T > C resulting in an amino acid substitution from leucine to proline in the mature ApoAI protein. This amino acid change led to lower cleavage and ApoAI deposition into the involved organs. Few years later, our patient remaining without treatment, came with symptoms consistent with primary hypogonadism but testicular involvement with ApoAI deposits could not be proven since the patient refused testicular biopsy. Based on this case, we recap the diagnostic challenges, the clinical manifestations, and the potential treatment options for this indolent hereditary amyloidosis subtype. CONCLUSIONS: This case-report enlarges the clinical picture of ApoAI-driven disease and its complex genetic background and in parallel suggests for a more systematic approach in any case with strong suspicion of hereditary amyloidosis.
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