Neurodegenerative Diseases
A I716T mutation of amyloid precursor protein gene in familial Alzheimer′s disease
Qi Wang, Wei Qin, Jing Dong, Hanzhi Li, Ying Li, Fangyu Li, Qiaoqi Wu, Jianping Jia
Published 2017-01-08
Cite as Chin J Neurol, 2017, 50(1): 24-27. DOI: 10.3760/cma.j.issn.1006-7876.2017.01.006
Abstract
ObjectiveTo analyze the clinical presentation and explore potential mutation of pathogenic genes in a Chinese family with early-onset familial Alzheimer′ s disease (EOFAD).
MethodsThe clinical features and the results of auxiliary examination were collected and analyzed. DNA was extracted from peripheral blood samples from 8 members of the EOFAD family as well as 20 patients with sporadic Alzheimer′s disease (SAD) and 50 healthy controls.By polymerase chain reaction and direct DNA sequencing, mutational analysis of presenilin 1(exons 3-12), presenilin 2(exons 1-12), and amyloid precursor protein (APP) genes (exons 16-17) was performed.
ResultsMolecular genetic analysis revealed that 6 patients had a mutation of g. 275339T>C in exon 17 of APP gene, which caused ATC conversion to ACC, resulted in the amino acid substitution as Ile716Thr(I716T). Among them one was patient with dementia, the other five were clinically normal but under onset age.The same mutation was not found in the SAD patients and healthy controls.
ConclusionsWe reported a novel I716T mutation in exon 17 of the APP gene in a Chinese EOFAD pedigree. This mutation probably promoted the pathogenesis of EOFAD in this Chinese pedigree, eventually resulting in dementia.
Key words:
Alzheimer disease; Amyloid beta-protein precursor; Gene; Mutation
Contributor Information
Qi Wang
Department of Neurology, Xuanwu Hospital, Capital Medical University
Center of Alzheimer′s Disease, Beijing Institute for Brain Disorders
Beijing Key Laboratory of Geriatric Cognitive Disorders
Neurodegenerative Laboratory of Ministry of Education of the People′s Republic of China, Beijing 100053, China
Wei Qin
Jing Dong
Hanzhi Li
Ying Li
Fangyu Li
Qiaoqi Wu
Jianping Jia