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Archive for June, 2012

Tip of the Month – June 2012

posted by DNA Identifiers @ 11:36 AM
Tuesday, June 5, 2012

While a paternity test can be conducted without the mother, it is always recommended that the mother be included in the test. Including the mother not only acts as a quality control step to ensure the proper child has been sampled, but it also strengthens the genetic evidence of the test. Not including the mother in the test can cut each individual paternity index value in half and increases the likelihood that the results will be inconclusive.

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Tip of the Month – May 2012

posted by DNA Identifiers @ 11:35 AM
Tuesday, June 5, 2012

Approximately 5% of samples (1 in every 20) needs to be re-extracted due to an insufficient amount of DNA on a buccal swab.  A low amount of DNA on a buccal swab is generally the result of a short sample collection time.  To ensure that sufficient DNA will be collected, we recommend a collection time of 30 seconds for each swab.    Re-extracting samples due to low DNA adds considerable effort and time and can result in a reporting delay of test results.  By swabbing for at least 20 seconds and preferably 30, you can ensure the collection of enough DNA on the swab so that we do not have to re-run your samples and that you will receive your results without delay.

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Tip of the Month – April 2012

posted by DNA Identifiers @ 11:33 AM
Tuesday, June 5, 2012

When a paternity index is calculated, one of the factors used in the computation is the allele frequency for the tested individual’s race.  An allele frequency indicates how often a particular allele is present in a given population and can vary between races.  For example, if the alleged father’s paternal allele (the allele in the father which matches the child) at the marker D8S1179 is a 16, and the alleged father is African American, then we would need to determine how often in the African American population the allele 16 occurs.  For African Americans, the allele frequency is 4%, meaning 4% of the African American population has an allele 16 at the genetic marker D8S1179.  Caucasian’s have an allele frequency of 1%, meaning 1% of the Caucasian population has a 16 allele at D8S1179.  Hispanic’s have an allele frequency of 2%, meaning 2% of the Hispanic population has a 16 allele at D8S1179.   It is important to document the race of the individuals tested because the race determines which allele frequency we will use in our statistical calculations of the paternity index.

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