Related Experiment Video
Updated: Jun 26, 2025
11:01
Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
Published on: August 30, 2011
13.6K
Episodic Memory Loss: When Alzheimer's Disease Is Not the Answer
Ernesto García-Roldán1,2, Richard Tsai3, Amy Berger3
1Department of Neurology, Memory Unit, Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío, Consejo Superior de Investigaciones Científicas, Universidad de Sevilla, Sevilla, Spain.
Journal of Alzheimer'S Disease Reports
|May 15, 2024
Summary
A genetic mutation in the progranulin (PGRN) gene caused severe memory loss in a patient presenting with Alzheimer-like symptoms. This finding highlights the importance of genetic testing for non-Alzheimer dementia diagnoses.
Area of Science:
- Neuroscience
- Genetics
- Neurology
Background:
- Cognitive disorders present diagnostic challenges, particularly when initial assessments for common neurodegenerative diseases like Alzheimer's disease (AD) are inconclusive.
- Early and accurate diagnosis is crucial for effective patient management and therapeutic interventions.
Observation:
- A 60-year-old man with memory complaints exhibited a severe hippocampal memory deficit on neuropsychological testing.
- Standard investigations, including Alzheimer's disease biomarkers in cerebrospinal fluid (CSF) and brain MRI, yielded normal results.
Findings:
- Next-generation sequencing identified a pathogenic progranulin (PGRN) gene variant (c.1414-1 G>T) in the patient.
- This specific PGRN mutation has been previously linked to a similar clinical presentation, suggesting a monogenic cause for the cognitive impairment.
Implications:
- This case underscores the necessity of considering non-Alzheimer monogenic mutations in patients with an Alzheimer-like presentation but negative AD biomarkers.
- Genetic testing for PGRN mutations should be considered in individuals with a family history of dementia and atypical cognitive decline.
- Expanding diagnostic criteria to include genetic screening can improve the identification of rare dementia subtypes.
Related Concept Videos
01:13Amnesia
123
Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
123
01:26Alzheimer's Disease: Overview
467
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
467
01:21Dissociative Amnesia
75
Dissociative amnesia is a complex psychological condition that manifests as an inability to recall personal information, often tied to traumatic or stressful events. Unlike general amnesia, individuals with this condition retain the ability to perform routine activities and procedural tasks, such as operating a phone or navigating public transportation, yet experience profound gaps in autobiographical memory. These lapses may encompass significant life events, such as suicide attempts or...
75
01:26Higher Mental Functions of Brain: Learning and Memory
746
Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or...
746
01:14Autobiographical Memory
5.3K
Autobiographical memory is a unique type of episodic memory that involves recollecting personal life experiences. It allows individuals to remember significant events from their past, creating a narrative of their lives. One interesting phenomenon related to autobiographical memory is the reminiscence bump. This effect refers to the tendency of adults to recall more events from their second and third decades of life — typically between ages 10 to 30 — than from other periods. This...
5.3K
01:30Dementia
112
Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual....
The progression of dementia is generally gradual....
112