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haplo-insufficiency

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haplo-insufficiency [¦hap‚lō ′in·sə‚fish·ən·sē]
(genetics)
In a diploid organism, the presence of an abnormal phenotype in which only one of the two copies of a particular gene yields its normal product, and a reduced amount rather than a qualitative change in the gene product leads to the phenotype. It is responsible for some, but not all, autosomal dominant disorders.


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[FIGURE 1 OMITTED] Advances in the field of genetics have estimated that about 2% of idiopathic short stature is related to haplo-insufficiency of the short stature homeobox (SHOX) gene, which is found on the short arm of the X and Y chromosomes in the pseudo-autosomal region.
Their topics include the phenomenology and mechanisms of dominance, phenotype and stochastic gene expression, mathematical models of haplo-insufficiency, biological consequences of dosage-dependent gene regulation in multicellular eukaryotes, and lessons from a genetic network about the causes of dominance.
Confirmation that velo-cardio-facial syndrome is associated with haplo-insufficiency of genes at chromosome 22q11.
 
 
 
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