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Cancers Originate from Somatic Mutations in a Single Cell

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...

Cancers Originate from Somatic Mutations in a Single Cell

Cancers Originate from Somatic Mutations in a Single Cell

Mutations

Mutations

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

Mutations

Mutations

Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Author Spotlight: Deciphering the Role of ATM in Ataxia-Telangiectasia and the Associated Cerebellar Degeneration

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Accrued somatic mutations (nucleic acid changes) trigger ALS: 2005-2015 update.

¹Tel Aviv University Sackler Faculty of Medicine and Assaf Harofeh Medical Center, Israel.

|January 23, 2016

Summary

This summary is machine-generated.

Acquired nucleic acid changes, specifically somatic mutations, are hypothesized to trigger the onset of sporadic Amyotrophic Lateral Sclerosis (ALS). This theory is supported by epidemiological data and disease progression patterns.

Keywords:

age-dependent penetrance age-specific incidence carcinogenesis neural network degeneration risk factors smoking

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Area of Science:

Neurology
Genetics
Epidemiology

Background:

Amyotrophic Lateral Sclerosis (ALS) is a complex motor neuron disease.
Disease onset mechanisms may differ from those causing progression and motor neuron death.

Purpose of the Study:

To present evidence supporting the hypothesis that acquired nucleic acid changes trigger sporadic ALS.
To integrate clinical, epidemiological, and quantitative findings related to ALS onset.

Main Methods:

Review of clinical and epidemiological evidence.
Analysis of disease incidence patterns, including age-related increases.
Evaluation of risk factors such as smoking.

Main Results:

Hypothesis of acquired nucleic acid changes triggering ALS strengthened since 2005.
Epidemiological clues, like age-incidence relationship and smoking risk, affirmed by quantitative analysis.
Focal onset and spread patterns further characterized.

Conclusions:

Accrued somatic mutations are a likely trigger for sporadic ALS onset.
Distinguishing disease initiation from progression is crucial for understanding ALS.
Further research into nucleic acid alterations in ALS is warranted.