[ensembl-dev] Exon order in transcipts

[Genomeo Dev]

Hi,

(1)

Using biomart it is possible to retrieve a sequence of a transcript with
information in the header about Exon Ranks in Transcript (see image below).
In this example, I wonder what order, it is correct to assume that
2;5;4;3;1 refer to some indices of the exons as defined based on the
canonical transcript? but what is the meaning of this unordered indices
here for this particular transcript?

>GRM3|ENSG00000198822|ENST00000546348|ENSP00000444064|1416|2;4;3;1
MRRTNHEPEPGCRLTAAAATAVSSSSCQELSVRAPFNPNKDADSIVKFDTFGDGMGRYNV
FNFQNVGGKYSYLKVGHWAETLSLDVNSIHWSRNSVPTSQCSDPCAPNEMKNMQPGDVCC
WICIPCEPYEYLADEFTCMDCGSGQWPTADLTGCYDLPEDYIRWEDAWAIGPVTIACLGF
MCTCMVVTVFIKHNNTPLVKASGRELCYILLFGVGLSYCMTFFFIAKPSPVICALRRLGL
GSSFAICYSALLTKTNCIARIFDGVKNGAQRPKFISPSSQVFICLGLILVQIVMVSVWLI
LEAPGTRRYTLAEKRETVILKCNVKDSSMLISLTYDVILVILCTVYAFKTRKCPENFNEA
KFIGFTMYTTCIIWLAFLPIFYVTSSDYRVQTTTMCISVSLSGFVVLGCLFAPKVHIILF
QPQKNVVTHRLHLNRFSVSGTGTTYSQSSASTYVPTVCNGREVLDSTTSSL*


(2)

What is Constitutive Exon feature in Biomart?  See bottom of picture. For
ENSG00000198822, exon 1 appears in all transcript but is not flagged as
constitutive by this feature.


Regards

-- 
G.
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