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Inverse View
It is not the case that Huntington's disease qualifies as a genetic condition on both individual and population accounts
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Reasons For
2 perspectives
Reason for 1 of 2
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1.
Causation requires more than statistical correlation between mutation presence and symptom expression across a population.
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2.
Age of onset, symptom severity, and progression in HD vary substantially, suggesting gene expression is modulated by non-genetic factors.
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3.
A condition whose phenotypic realization depends on developmental and environmental context is not adequately explained by genetic accounts alone.
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Reason for 2 of 2
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1.
Kendler and Crasnow argue that 'genetic condition' conflates distinct explanatory levels: molecular causation, population statistics, and clinical taxonomy.
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2.
HD satisfies the individual account only under a ceteris paribus clause that smuggles in background conditions the genetic account cannot itself specify.
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Reasons Against
1 perspective
Reason against
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1.
A single mutant gene is necessary, and arguably sufficient given standard background conditions, for symptoms to appear in an individual
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2.
The presence and absence of disease symptoms across a population is accounted for by the presence and absence of the mutation
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