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Prevention of avoidable mutational disease: memorandum from a WHO meeting
Insights
Approximately 2% of children are born with or develop serious genetic disorders due to mutations. Preventing increased mutation rates and identifying at-risk populations are key public health strategies for mutational disease prevention.
Area of Science:
- Genetics
- Public Health
- Molecular Biology
Background:
- Serious genetic disorders affect approximately 1% of children at birth and another 1% after birth.
- These conditions, often impacting blood, bone, brain, or senses, result from inherited or spontaneous mutations and are typically irreversible upon diagnosis.
- Beyond direct effects, mutations have widespread indirect health consequences, imposing a significant burden disproportionate to their frequency.
Purpose of the Study:
- To outline public health strategies for preventing mutational diseases.
- To review advancements in understanding the mutational process and its consequences.
- To emphasize the need for improved methods to identify and study populations at increased risk for genetic disorders.
Main Methods:
- Review of current understanding of the mutational process.
- Analysis of population risk factors for genetic diseases.
- Evaluation of the consequences of various mutational events.
Main Results:
- Several thousand known genetic disorders stem from mutational events.
- Minimizing exposure to mutagens and preventing births with known mutations are crucial public health policies.
- Prevention prospects are limited to mitigating increases in mutation rates due to natural rates and accumulated mutations.
Conclusions:
- Effective prevention of mutational diseases requires a focus on minimizing mutagenic exposures and identifying at-risk populations.
- Continued research into dissecting and interpreting the mutational process is essential.
- Improving the study of populations at increased risk is paramount for current prevention strategies.
Abstract:
About 1% of children are born with a serious disorder which is the direct result of a mutational event in a parent or a more distant ancestor. These disorders, of which several thousand are known, mainly afflict the blood, bone, brain, ear, eye or muscle and the changes are usually irrevocable by the time of diagnosis. Another 1% of individuals will develop a serious genetic disease some time after birth. In addition to these direct consequences of a mutant event, far higher proportions will suffer from the indirect effects of one or several mutations.In view of their chronic and severe nature most of these disorders impose a burden disproportionate to their frequency, and it is sound public health policy to avoid the birth of babies known to have the established mutations and prevent further cases in the immediate or distant future by minimizing the exposure of people at risk to known mutagens. The advantages in permitting certain mutagenic exposures must be assessed against the later costs.Owing to the natural mutation rate and the vast backlog of previous mutations, the prospects of prevention are limited to preventing an increase, rather than to achieving any substantial decrease. This Memorandum describes progress in the ability to dissect and interpret the mutational process, to identify populations at risk, and to evaluate the consequences of the various types of mutational event and emphasizes that the current approach to prevention of mutational disease must involve improving our ability to study populations that appear to be at increased risk.