The Y-Chromosome DNA test, sometimes referred to as a Y-STR comparison, is a test that can be performed between two males to determine if they share the same male ancestral line. It is often used in paternity cases where the alleged father is not available for testing. This test can indicate whether or not a child is related to the alleged father’s brothers or other male relatives who share a common paternal line. It can also be done between alleged two or more alleged half-brothers. The DNA of the mother is not needed when this option is used to determine paternity.
A Y-STR analysis cannot distinguish a specific relationship between males who belong to the same paternal line. It is, however, very useful for excluding males from an alleged biological relationship. For example, if a male child and his alleged uncle (alleged father’s full brother) are tested, their Y-STR profiles must match. If they do not, then the alleged uncle is excluded (not considered a biological uncle) and the brother of the uncle tested is probably not the biological father.
How does a Y-STR DNA test work?
Y- STR is an abbreviation for Short Tandem Repeats (STRs) which are found on the male-specific “Y” chromosome. The coding genes, mostly found on the short arm of the Y-chromosome, are vital to male sex determination and other male related functions. Based on the genetic fact that the Y-chromosome is passed from father to son(s) relatively unchanged through many generations and has an infrequent mutation rate, this DNA test examines highly differential markers on the Y chromosome and DNA profiles for these markers are generated. These Y-STR profiles are then compared to determine if there is a match. Males related through their fathers will have the same or very similar Y-STR profiles, and those who are not have different profiles.
Although the Y-Chromosome is only found in males, women can also indirectly participate in a Y-STR DNA test if they are interested in determining their paternal relatives. They would need to ask a biological male relative, such as a father, brother, paternal uncle, or paternal grandfather to contribute a sample for comparison testing with her potential paternal relative.
How much does a Y-Chromosome test cost?
Journey Genetics is able to perform the most accurate Y-Chromosome DNA testing available, comparing 22 specific genetic markers on the Y-Chromosome. All pricing is determined by the number of males being tested and the type of sample being sent.
When ordering a Y-STR test you may choose to either use a testing kit from Journey Genetics or have the option to make your own DNA collection kit. This may be especially helpful if you need to have non-swab samples tested, or do not want to wait for the DNA kit to arrive to your shipping location if you are facing time constraints to obtain results.
We know how important these answers are to you, and we want to help you learn the truth as quickly as possible. The Y-STR testing process must be performed several times before the results can be released in a report with 100% accuracy. Results are delivered in 2 business days when using standard mouth swabs for the DNA samples..
Results are provided in a PDF file delivered to the email address provided for results at the time of the order once they are ready. DNA results are always kept confidential and your DNA is never used for any other research purpose or provided to any other person, company, or government agency. Your private information will always remain private. All personal information on your case is deleted from our system 30 days after the results have been delivered to demonstrate our commitment to your privacy.
Can two or more people test when they live in different locations?
We can send DNA collection kits to multiple addresses for the same test. When ordering, just select how many kits you need (one per address is suggested if in different geographic areas). List the names and addresses we are shipping to on the order form in the designated box. Each test kit will be coded with your unique case number and matched with both the name of the person and your case number in lab. Testing will begin once all samples have been received.