New homology assertion: Tardigrade whole body homologous to arthropod head

[cmungall]

Smith, F. W., Boothby, T. C., Giovannini, I., Rebecchi, L., Jockusch, E. L., & Goldstein, B. (2016). The Compact Body Plan of Tardigrades Evolved by the Loss of a Large Body Region. Current Biology, 26(2), 224–229. http://dx.doi.org/10.1016/j.cub.2015.11.059

Inferred from gene expression evidence (HOX genes)

Could be broken down into homology assertions for 5 segments; following is a recreation of Figure 4 (not sure I have permission to paste the image)

Tardigrada	Chelicerata	Myriapoda	Onychophora
Oc	Oc	Oc	Oc
L1	Ch	Ant	J
L2	Pp	Int	Sp
L3	L1	Mn	L1
L4	L2	Mx1	L2
	...	...	...

Ant, antenna; Ch, chelicera; Int, intercalary; J, jaw; L1–L4, legs; Mn, mandible; Mx1, maxilla 1; Oc, ocular; Pp, pedipalp; Sp, slime papilla.

Of course, the homology of the arthropod head is a contentious issue, not sure we should go near this in Uberon, we need a revived PAAO (Pan Arthropod Anatomy Ontology) here. cc @dosumis.

[ANiknejad]

Thank you, Chris, so far I only recorded the broad possible homology between arthropod head and tardigrade body

[ANiknejad]

Following discussion with Marc RR @marcrr now this annotation is corrected to Tardigrada, see the commit above

"Our data suggest that nearly the entire tardigrade body axis is homologous to just the head region of arthropods."

...well, @marcrr actually I am still wondering if the annotation should not be maintained on UBERON:0000468|UBERON:0000033" "multi-cellular organism|head" 88770 "Panarthropoda"

because arthropoda head and body of tardigrada are then homologous, and the common ancestor to both arthropoda and tardigrada is Panarthropoda. So far it is the way we build our homology statements, please let me know if I am missing something here

ANN March 2018, annotation on Panarthropoda would be correct with
"tardigrada body|head" ,I guess

[ANiknejad]

hi Chris @cmungall

May I suggest to have 'tardigrade body' as a new class? I would help use to report the homology relationship between the head of arthropoda and the whole body of tardigrades. Or are we allowed to use

NCBITaxon:42241 ! Tardigrada

as a class, like it sounds to be the case in the example here below?

[Term]
id: UBERON:6000004
name: insect head
xref: FBbt:00000004
is_a: UBERON:0000033 ! head
relationship: part_of NCBITaxon:50557 ! Insecta

If yes, I suggest to report the annotation

NCBITaxon:42241, UBERON:0000033	tardigrada, head	PMID:26776737 "Smith FW, Boothby TC, Giovannini I, Rebecchi L, Jockusch EL, Goldstein B, The Compact Body Plan of Tardigrades Evolved by the Loss of a Large Body Region. Curr Biol (2016)"	ECO:0000075	gene expression similarity evidence	CIO:0000005	low confidence from single evidence	88770	Panarthropoda	Here, we reveal molecular identities for all of the segments of a tardigrade. Based on our analysis, we conclude that tardigrades have lost a large intermediate region of the body axis-a region corresponding to the entire thorax and most of the abdomen of	bgee	ANN

Thank you for your patience.
Cheers,

Anne