The frontotemporal dementia-motor neuron disease continuum

Area of Science:

• Neurology
• Neuroscience
• Genetics

Background:

• Motor neuron disease (MND) is increasingly recognized to encompass cognitive and behavioral deficits.
• The concept of a frontotemporal dementia-motor neuron disease (FTD-MND) continuum has gained prominence over the last decade.
• FTD-MND represents a significant dementia syndrome with diagnostic and management challenges.

Purpose of the Study:

• To review the current understanding of the FTD-MND continuum.
• To highlight the shared pathological features and genetic underpinnings.
• To discuss the implications for diagnosis, pathogenesis, and therapeutic targets.

Main Methods:

• Review of existing literature on FTD-MND.
• Analysis of common pathological hallmarks, including TAR DNA binding protein (TDP-43) pathology.
• Examination of genetic factors, particularly the chromosome 9 open reading frame 72 (C9orf72) repeat expansion.

Main Results:

• FTD, MND, and FTD-MND share overlapping TDP-43 proteinopathy patterns.
• The C9orf72 repeat expansion is prevalent across the FTD-MND spectrum.
• This genetic expansion offers crucial insights into disease mechanisms and potential therapeutic avenues.

Conclusions:

• FTD-MND is an important dementia syndrome requiring further clinical definition.
• Shared pathology and genetics underscore the continuum between FTD and MND.
• Understanding these commonalities is vital for advancing diagnosis and developing targeted therapies.