Addon:DNASegmentMapGramplet

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This is a Third-party Addon. Please use carefully on data that is backed up, and help make it better by reporting any comments or problems to the author, or issues to the bug tracker Unless otherwise stated on this page, you can download this addon by following these instructions. Please note that some Addons have prerequisites that need to be installed before they can be used. This Addon/Plugin system is controlled by the Plugin Manager.

Example DNA Segment Map Gramplet

The DNA Segment Map Gramplet shows a graph.

Usage

You can install the DNA Segment Map Gramplet on the bottombar of one of the people category list views.

Create a DNA Association

To specify shared DNA segments between 2 people,

• Create an Association for one person (Person A) with another Person (Person B) of the type DNA.
• Create a Note in the Association of Type: "Association Note" with the shared DNA segment data.
  • The format of the Note is a comma separated list in the order: Chromosome Number, Start Segment, End Segment, shared length in cMs, SNP (optional).
  • eg: 3,56950055,64247327,10.9,1404 Which means; Chromosome Number: 3, Start Segment: 56950055, End Segment: 64247327, shared length in cMs: 10.9, matching SNPs: 1404
  • Valid entries for each are:

Chromosome Number

number between 1-22 or X

Start Segment

The starting number for the segment location.

End Segment

The endinging number for the segment location.

Shared length in cMs

The Genetic Distance otherwise known as the number of centiMorgans in the segment.

SNP

optional field of the matching SNPs (Single Nucleotide Polymorphism) in the segment.

Getting the chromosome data

Sites like GEDmatch make this shared chromosome data available. There can be additional Associations between Person A and Person C et cetera as known.

Legend

• For each Chromosome the top portion is the Paternal side and the bottom portion is the Maternal side.
• The chromosome segment side (Paternal or Maternal) is determined from the Most Recent Common Ancestor. If there is no common ancestor, both sides are used.
• Hovering the cursor over a painted chromosome segment will show a tooltip with the name of the associated person, ID, length in cMs (centiMorgans) of the shared segment, and matching SNPs of the segment if provided.
• The color code for each associated person in the DNA segment map is consistent but not user-specified. The first Association will always be the same color.

DNA Example data

To reproduce the illustration with the Example.gramps dataset, create two Associations of type DNA for Luther Robinson(I0656).

The first is DNA Association for Robert F. Garner (I1123).

3,56950055,64247327,10.9,375
11,25878681,35508918,9.9,396
12,129481599,133491098,12.4,304
15,35444614,64710827,33.3,1212
1,48053426,68837810,24.6,3413
1,72956037,87857969,13.4,2035
3,69656569,74563488,9.0,974
6,6179882,15400114,18.5,1994  

The second is for the DNA Association of Maude Garner (I0651).

1,30578594,38686908,11.2,334
1,236520701,249210707,29.7,685
3,14446545,24339734,12.3,458
3,128688499,140766208,11.4,447
4,76585823,114118650,33.7,1317
4,163973796,190915650,49.1,1422
6,4737179,9181572,10.3,279
6,39128976,49586285,15.8,510
6,150564916,156389148,10.2,415
7,18915133,37547290,25.8,1038
7,93557588,116296896,20.2,821
7,141636563,156148608,30.9,787
8,2808265,6919748,10.7,436
8,12568161,42652859,38.7,1556
8,49039681,71454529,20.3,742
8,71990280,99554231,21.9,917
9,78958599,122204804,55.7,2014
10,5608202,10769007,10.4,333
10,19365648,38434090,19.6,775
11,26722523,37020611,11.8,447
12,66412457,94422155,24.4,1035
13,19234747,23899627,8.7,270
13,74422984,91183468,14.2,506
14,23902753,33048583,15.5,392
14,88816167,106020366,37.8,947
15,23727655,27246462,8.2,229
16,22836249,32137965,12.6,413
16,46644903,54620503,11.7,360
17,13905,6613192,18.9,419
17,25567080,44187492,19.7,694
17,44790203,72115774,39.7,1223
18,18714991,47726830,27.9,1071
18,69454453,77894844,23.5,481
19,1993444,11174625,28.1,567
19,54545531,59087479,12.7,335
20,9879166,26225145,24.3,788
20,30221104,43975451,13.5,489
21,14670124,18743733,10.8,201

Example

Create an Association of type DNA as described in the Association page to Person A. Add a Note with the DNA shared segment data. Set the Note private if you do not want the data printed in reports.

Save the Association.

Add more associations as known. Each would be associated to a different person and have a different Note. Since the Associations are drawn in order, it is generally better to have them in order of closest relative to furthest relative to avoid obscuring a distant relative (smaller segment) by a close relative (larger segment). Use the up-arrow and down-arrow to change the order of the Association.

Add the DNA gramplet to the Person view. Select the DNA tab. The segment map will be color coded by associated person. For each Chromosome the top portion is the P (Paternal) side and the M (Maternal) side is the bottom portion. If the chromosome segment side (Paternal or Maternal) is unknown, the segment will cover both the top and bottom portions of the chromosome and be 50% transparent.

Hovering the cursor over a known segment will pop up the name of the associated person and the length (in cMs) of the shared segment.

Issues

• If the Chromosome Number is not in the range (1, 2, ..., 22, X) it is ignored.
• If there are multiple paths to a common ancestor, the closest found is used.
• To create a segment map for Person A, you need to add associations to Person A. There is no reciprocal relationship for Person B - that is, there is no segment map for Person B, only for Person A. You can execute the Addon:SyncAssociation addon to create any missing reciprocal relationships.
• Color code for each associated person in the map is consistent but not user-specified. The first Association will always be the same color.
• Help link goes to https://gramps-project.org/wiki/index.php?title=Gramps_5.1_Wiki_Manual_-_Gramplets#DNA
• If there are overlapping segments within a maternal/paternal view of a chromosome, only the front (last drawn) will be pickable. If it is completely obscured, you will not be able to see the details of the hidden segment. Changing the order of Associations (using the up-arrow and down-arrow) to have the closer relatives before further relatives will fix this.

See also

• Addon:SyncAssociation - For every Association, if there is not a reciprocal Association then it will be created. That is, where Person John Smith has a DNA Association (with an Association Note) to Person Jane Jones, then if Jane Jones does not have a corresponding DNA Association to John Smith, it will be created which shares the Note.
• Discourse forum discussion on the DNAgrample
• Gramps_5.1_Wiki_Manual_-_Entering_and_editing_data:_detailed_-_part_1#Associations
• Roles, Relationships & Associations
• Genetics