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The DNA repair function of alpha-synuclein appears to be compromised in Lewy body inclusion bearing neurons, and this may trigger cell death. Study of synucleinopathy mouse models of Parkinson's disease indicates that alpha-synuclein pathogenesis is associated with increased DNA damage and activation of the DNA damage response. [19]
A Lewy body is composed of the protein α-synuclein associated with other proteins, such as ubiquitin, [9] neurofilament protein, and alpha B crystallin. Tau proteins may also be present, and Lewy bodies may occasionally be surrounded by neurofibrillary tangles .
Two 1997 discoveries highlighted the importance of Lewy body inclusions in neurodegenerative processes: a mutation in the SNCA gene that encodes the alpha-synuclein protein was found in kindreds with Parkinson's disease, and Lewy bodies and neurites were found to be immunoreactive for alpha-synuclein. [234]
Other types of dementia that affect those over 65 include Lewy body dementia, brought on by abnormal deposits of the protein alpha-synuclein known as Lewy bodies, vascular dementia, created by ...
There are two types of Lewy body dementia: dementia with Lewy bodies and Parkinson’s disease dementia. “Lewy body dementia is different from other forms of dementia based on the type of ...
[12] [13] The Lewy body dementias—dementia with Lewy bodies (DLB), and Parkinson's disease dementia (PDD)—are distinguished by the timing when cognitive and motor symptoms appear. [14] The two Lewy body dementias are often considered to belong on a spectrum of Lewy body disease that includes Parkinson's disease. [2] [5]