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-   -   Phylotree question (http://forums.familytreedna.com/showthread.php?t=41340)

Slithy Tove 6th March 2017 06:51 AM

Phylotree question
 
1 Attachment(s)
Hi all,

Phylotree has, on occasion, a branch with a mutation listed but no subclade reference for the node.

See the attachment for an example.

In this case is phylo saying that T152C! is a back mutation present in subclades U5a1a1a, U5a1a1b, and U5a1a1h but not in U5a1a1c?

Or is it something different?

regards
Gavan

GST 6th March 2017 02:41 PM

Quote:

Originally Posted by Slithy Tove (Post 436360)
In this case is phylo saying that T152C! is a back mutation present in subclades U5a1a1a, U5a1a1b, and U5a1a1h but not in U5a1a1c?

Yes, you interpreted this correctly. However, I don't think it is useful to include highly volatile markers like 152, 195, 16362, etc as unnamed branch point in the phylotree. There will be some people in U5a1a1a with C152T!! and some people in U5a1a1c with T152C! These markers might (or might not) have some value when you are looking at your closest matches, but they don't add much informational value to the phylotree. FTDNA includes these branch names in subclade assignments, and I think mostly just confuses people.

Gail

Slithy Tove 8th March 2017 04:23 AM

Quote:

Originally Posted by GST (Post 436379)
highly volatile markers ... don't add much informational value to the phylotree.
Gail

Thanks, Gail.

Is this why Phylotree says "309.1C(C), 315.1C, AC indels at 515-522, A16182c, A16183c, 16193.1C(C) and C16519T/T16519C were not considered for phylogenetic reconstruction"?

Gavan

GST 10th March 2017 11:22 AM

Quote:

Originally Posted by Slithy Tove (Post 436445)
Thanks, Gail.

Is this why Phylotree says "309.1C(C), 315.1C, AC indels at 515-522, A16182c, A16183c, 16193.1C(C) and C16519T/T16519C were not considered for phylogenetic reconstruction"


Yes - in general, these are the most volatile of the hyper variable region (HVR) markers. But other markers can also be very volatile, for example, in some haplogroups 16093 seems to be much less stable than 16519. When you see large variability in an HVR marker, I would discount the value of that marker. Some HVR markers can be much more "hyper" than others.


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