Relative Finder Information (v0.3):
Relative finder allows you to search for biological relatives based on DNA matches. If you decide to get a report, you will be able to see the names, contact information, estimated relationship, and the location of shared DNA segments for each potential relative. Your relatives will be able to see the same information about you. The tool is currently experimental and under development.
This is how a basic relative finding report looks:
Interpreting your relative finder report:
"High Certainty Matches" refers to users who share many long segments which likely originated from a recent common ancestor. "Speculative Matches" refers to users who share long segments, but more likely due to multiple distant ancestors rather then a single recent one.
- Matching individuals:You will be able to see the name and email of your matched relative.
- Relation degree: This number represents the estimated degree of relationship between you and your matched relative. The report also suggests a possible genealogical relationship that could match your degree of relationship.
- # Shared Segments: Number of shared segments (the number of blocks) between individuals. For close relatives (e.g. sibling), this number is usually an upper bound of the actual shared segments. The reason is that our pipeline uses genetic imputation algorithm to computationally increase the number of SNPs of the input data. As imputation is not 100% errors-free, a few erroneous SNPs can break a very long shared segment into two (usually still long) segments and increase the reported number of segments.
- Total Shared Length: This number denotes the sum of the total shared segments measured in centiMorgans (this is a metric geneticists use to define the distance between chromosome positions, which roughly equals 1 million base pairs).
- Total Recent Shared Length: This number denotes the sum of the total shared segments from recent ancestry (the red blocks) measured in centiMorgans. Only segments that are recent are counted towards relatedness calculations.
- Longest Recent Shared Segment: Of the recently shared segments, this is the length of the longest one.
- Relationship likelihood: The relationship likelihood reflects the uncertainty of the relative finder inference. It shows the normalized likelihood of the relationship degree from column 2.
- Shared chromosomal segments: This graph shows all all autosomes and the positions of the shared segments with the matched relative. These segments come from either recent ancestry (the red blocks) or more distant population background (ping-orange blocks). The derivation of recent versus ancient segments utilizes the length of the segments. Short segments have higher probability to be reported as ancient whereas long segments are usually reported as recent.
- Table of shared segments: In order to view the actual locations of the shared segments, click on the "SHOW/HIDE TABLE" button (red arrow in the figure below). The locations are reported using Build 373/hg19 coordinates of the human genome. Please bear in mind that this feature is experimental.
Table of shared segments
(table is truncated for presentation purposes)
Things to considerRelative finder reports allow you to learn more about your family and genealogy. However, in some cases, it can reveal unexpected findings such as non-paternity events. The report also presents the DNA segments that you and your relative share and classifies the shared segments as ancient and recent segments using a statistical algorithm (right most column). With this information, you and your relative can better understand how you are related. However, this could reveal some information to your relative about your DNA sequence in the shared regions. For example, if your relative has a specific allele in one of the shared segments, she or he could estimate that there is a 50% chance you have the same allele. If you decide not to participate in relative finding, your relatives will not be able to see this information. However, you will not be able to see your relative finder report.