Cryptic causation of human disease: reading between the (germ) lines

Area of Science:

• Genetics
• Genomics
• Disease Etiology

Background:

• Complex human diseases often show familial aggregation but genetic mapping struggles to identify causative genes.
• Current genetic mapping methods may overlook variations arising from somatic mutations (SM).
• Somatic mutations are implicated in cancer epidemiology and may play a role in other complex diseases like epilepsy.

Purpose of the Study:

• To highlight the potential role of somatic mutations (SM) in complex diseases.
• To emphasize the limitations of current genetic mapping approaches in identifying disease-causing genes.
• To advocate for direct study of somatic mutations to understand their etiological role.

Main Methods:

• Review of existing literature on genetic mapping and disease etiology.
• Analysis of epidemiological patterns in complex diseases, including cancer and epilepsy.
• Discussion of emerging technologies for detecting and characterizing somatic mutations.

Main Results:

• Intensified genetic mapping has identified only a small fraction of familial risk in complex diseases.
• Somatic mutations (SM) offer a potential explanation for the 'missing heritability' in many genetic disorders.
• Epilepsy serves as an example where undamped neuronal signaling, linked to gene function, might involve SM.

Conclusions:

• Somatic mutations (SM) are a significant, yet understudied, etiological factor in complex diseases.
• Advances in technology are improving the detection of SM, paving the way for direct investigation.
• Understanding SM is essential for a complete picture of disease causation, particularly for conditions with a genetic component.