Prevalence
The number of people with a trait or condition at a specified point in time.

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Gene Variant
A variation in the sequence most commonly observed for a particular gene.

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Genotype
The genetic make-up of an individual.

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Phenotype
The observable traits or characteristics of an individual.

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Single Nucleotide Polymorphism – SNP
Common, but minute, variations that occur in human DNA at a frequency of one every 1,000 bases.

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Genomic Profiling
Concurrent detection of multiple gene variants associated with predisposition to a particular disease.
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Pharmacogenomics
Refers to the use of genomic techniques to enhance drug development and define drug responses.
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Quality-Adjusted Life Years (QALYs)
Outcome of a treatment measured as the number of years of life saved, adjusted for quality.
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Single-Gene Variant or Single-Gene Disorders
A trait or disorder that is controlled by a single gene.
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Bioinformatics
The science of managing and analyzing biological data using advanced computing techniques; especially important in
analyzing genomic research data.
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Autosomal Recessive
Inheritance of two copies of a mutant gene, one from each parent, on one of the 22 autosomes (chromosomes other than
X or Y).
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Homozygous
Possessing two identical copies of a particular gene, one inherited from each parent.

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Penetrance
Probability that manifestations of a gene change will be seen in an individual.
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"Home Brew"
Almost all genetic tests are performed by laboratories that have developed these tests in-house.
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Public Health Professional
A person educated in public health or a related discipline who is employed to improve health through a population focus.
(Who Will Keep the Public Healthy? Educating Public Health Professionals in the 21st Century, IOM, 2003, p.30)
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Trisomy
The presence of an extra chromosome, resulting in a total of three chromosomes of that particular type instead of the
usual pair.
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Page last reviewed: June 8, 2007 (archived document)
Page last updated: September 10, 2007
Content Source: National Office of Public Health Genomics