{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T15:40:54Z","timestamp":1784734854357,"version":"3.55.0"},"reference-count":34,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,1,30]],"date-time":"2024-01-30T00:00:00Z","timestamp":1706572800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medicina"],"abstract":"<jats:p>Background and Objectives: Hereditary transthyretin amyloidosis (ATTRv) is a rare disease caused by pathogenic variants in the transthyretin (TTR) gene. More than 140 different disease-causing variants in TTR have been reported. Only a few individuals with a rare TTR variant, c.302C&gt;T, p.(Ala101Val) (historically known as p.(Ala81Val)), primarily associated with cardiac ATTRv, have been described. Therefore, our aim was to analyze the clinical characteristics of individuals with the identified c.302C&gt;T TTR variant at our center. Materials and Methods: We analyzed data from individuals with ATTRv who were diagnosed and treated at Vilnius University Hospital Santaros Klinikos. ATTRv was confirmed by negative hematological analysis for monoclonal protein, positive tissue biopsy or bone scintigraphy and a pathogenic TTR variant. Results: During 2018-2021, the TTR NM_000371.3:c.302C&gt;T, NP_000362.1:p.(Ala101Val) variant was found in one individual in a homozygous state and in three individuals in a heterozygous state. The age of onset of symptoms ranged from 44 to 74 years. The earliest onset of symptoms was in the individual with the homozygous variant. A history of carpal tunnel syndrome was identified in two individuals. On ECG, three individuals had low QRS voltage in limb leads. All individuals had elevated NT-proBNP and hsTroponine I levels on baseline laboratory tests and concentric left ventricular hypertrophy on transthoracic echocardiography. The individual with the homozygous c.302C&gt;T TTR variant had the most pronounced polyneuropathy with tetraparesis. Other patients with the heterozygous variant had more significant amyloid cardiomyopathy. When screening family members, the c.302C&gt;T TTR variant was identified in two phenotypically negative relatives at the ages of 33 and 47 years. Conclusions: c.302C&gt;T is a rare TTR variant associated with ATTRv cardiomyopathy. The homozygous state of this variant was not reported before, and is associated with earlier disease onset and neurological involvement compared to the heterozygote state.<\/jats:p>","DOI":"10.3390\/medicina60020237","type":"journal-article","created":{"date-parts":[[2024,1,30]],"date-time":"2024-01-30T03:45:12Z","timestamp":1706586312000},"page":"237","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Rare c.302C&gt;T TTR Variant Associated with Transthyretin Amyloidosis"],"prefix":"10.3390","volume":"60","author":[{"given":"Dovil\u0117","family":"\u017debrauskien\u0117","sequence":"first","affiliation":[{"name":"Department of Human and Medical Genetics, Institute of Biomedical Sciences, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0372-6996","authenticated-orcid":false,"given":"Egl\u0117","family":"Sadauskien\u0117","sequence":"additional","affiliation":[{"name":"Clinic of Cardiac and Vascular Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R\u016bta","family":"Masiulien\u0117","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sigita","family":"Aidietien\u0117","sequence":"additional","affiliation":[{"name":"Clinic of Cardiac and Vascular Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agn\u0117","family":"\u0160iaudinien\u0117","sequence":"additional","affiliation":[{"name":"Center of Haematology, Oncology and Transfusion Medicine, Vilnius University Hospital Santaros Klinikos, LT-08661 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valdas","family":"Pe\u010deli\u016bnas","sequence":"additional","affiliation":[{"name":"Center of Haematology, Oncology and Transfusion Medicine, Vilnius University Hospital Santaros Klinikos, LT-08661 Vilnius, Lithuania"},{"name":"Clinic of Internal Medicine, Family Medicine and Oncology, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1726-5825","authenticated-orcid":false,"given":"Gabriel\u0117","family":"\u017dukauskait\u0117","sequence":"additional","affiliation":[{"name":"Department of Human and Medical Genetics, Institute of Biomedical Sciences, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edvardas","family":"\u017durauskas","sequence":"additional","affiliation":[{"name":"National Center of Pathology, Vilnius University Hospital Santaros Klinikos, LT-08406 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nomeda","family":"Valevi\u010dien\u0117","sequence":"additional","affiliation":[{"name":"Department of Radiology, Nuclear Medicine and Medical Physics, Institute of Biomedical Sciences, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u016brat\u0117","family":"Barysien\u0117","sequence":"additional","affiliation":[{"name":"Clinic of Cardiac and Vascular Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Egl\u0117","family":"Preik\u0161aitien\u0117","sequence":"additional","affiliation":[{"name":"Department of Human and Medical Genetics, Institute of Biomedical Sciences, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,30]]},"reference":[{"key":"ref_1","first-page":"595","article-title":"Hereditary Transthyretin Amyloidosis Overview","volume":"43","author":"Manganelli","year":"2022","journal-title":"Neurol. 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