Wild-type transthyretin amyloid
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Wild-type transthyretin amyloid (WTTA), also known as senile systemic amyloidosis (SSA),[1] is a disease that typically affects the heart and tendons of elderly people. It is caused by the accumulation of a wild-type (that is to say a normal) protein called transthyretin. This is in contrast to a related condition called transthyretin-related hereditary amyloidosis where a genetically mutated transthyretin protein tends to deposit much earlier than in WTTA due to abnormal conformation and bioprocessing. It belongs to a group of diseases called amyloidosis, chronic progressive conditions linked to abnormal deposition of normal or abnormal proteins, because these proteins are misshapen and cannot be properly degraded and eliminated by the cell metabolism.