Pseudogene ontology

Q:
I’m currently working on reasoning with ontologies, and found in big
interest in reading your paper about reasoning of the pseudogene set.
I’m particularly interested in the time you give for the reasoning to
complete, since performance is my biggest issue. So I wanted to ask
you what was the size of the data you used, since the pseudogene set
does not seem to be available online anymore.

A:
The pseudogene data set used in this paper can be found at:
http://www.pseudogene.org/sdpgenes/all_pgenes/, which is based on
Ensembl genome release 48. There are 2,294 duplicated pseudogenes and
10,187 processed pseudogenes, in chromosome 1-22, X and Y. Hope this
helps.

PGOHUM00000250823 and SETP13/SETP3 pseudogenes

Q:

Could you please investigate the support you have for PGOHUM00000250823? At NCBI, we have PGOHUM00000250823 associated with HGNCid 42932, official symbol SETP13, and RefSeq accession NG_032538.1. However, we have a nearly identical RefSeq accession NG_032022.1 associated with HGNCid 31115 and official symbol SETP3. On the current human reference assembly, GRCh38, both NG_032538.1 and NG_032022.1 align perfectly to the same locus and have no other hits of comparable quality to the reference assembly (or to alternate assemblies HuRef or CHM1_1.1). In NCBI’s latest annotation (Annotation Release 106) SETP3 was annotated on the assembly but SETP13 was not because it overlapped with SETP3. Do you have any evidence these are distinct pseudogenes? If not, NCBI’s preference would be to preserve the older nomenclature associated with SETP3 and NG_032022.1. Also, if we agree that SETP13 is redundant with SETP3 then I will proceed to notify HGNC and will CC you on that email.

A:
I looked at the PGOHUM00000250823/SETP13 locus. Our pipeline
predicted it as a pseudogene to SET with around 90% sequence identity.
When compared to SETP3 locus, SETP13 lacks sequences at both 3’ and 5’
ends, which can be aligned to the UTR regions of SET. Our pipeline
missed these sequences at both ends because it searches for homologous
sequence to CDS regions only. We are actually thinking of including
some checks of UTR alignment in our revised pipeline. Thanks for
pointing this case to us.

We have no problem to merge the SETP13 locus with SETP3.

The pseudogene information of zebrafish in Pseudogene.org should be updated

Q:
In Pseudogene.org, the pseudogene datasets of zebrafish (Danio rerio)
was based on old annotations (Ensembl 55?). There were about ~1800
processed pseudogenes. However, based on a recent research
(http://www.nature.com/nature/journal/v496/n7446/full/nature12111.html),
there were rare pseudogenes in zebrafish. (Only 21 processed
pseudogenes, according to Supplementary Table 14 in the published
manuscript).

Is this great conflict due to the old annotations?

A:
You are right about the zebrafish pseudogenes in the pseudogene.org. The results were based on an old genome assembly, ENSEMBL release 55, which was done in year 2009. We do notice that the pseudogene number is way too high, which we believe partially due to the quality of the genome assembly, and partially due to the reason that the pipeline parameters were optimized with primates. Given that, for up-to-date pseudogene information in Zebrafish, people should refer to the Nature publication: http://www.nature.com/nature/journal/v496/n7446/full/nature12111.html.

Thanks for pointing this out to us.

information about pseudogene.org

Q1:

I am interested in using the information in your database to design PCR probes that would recognize usable and ensuing pseudogenes for several genes.

Do I need to obtain any type of written permission to use this information?

A1:
Nope!

Q2:
I checked one gene, with 9 pseudogenes listed and tried to align the
sequences to make PCR primers to detect the 10 copies, however, I realized
that being a bit naïve about pseudogenes led me down the wrong path, as I
thought the sequences would be more similar, and adept to being used to
estimate copy number for inserting foreign genes. While I did get regions
that hit 3-6 of the 10 genes, it wasn’t consistent enough.

I was wondering if you have the data about % conservation or any types of
algorithms that would predict the % conservation of pseudogene to gene and
pull out those names/gene Ids and number of pseudogenes?

A2:
It would be helpful if you can tell us a bit more about what you are trying to do.
I assume you are looking at human pseudogenes. We do have percent identity between the parent protein and the pseudogene.

Q3:
I’m trying to figure out a sensible way to use the numbers of the pseudogene/gene as a natural standard curve for real time PCR. See attached excel file. I chose at random genes with 9 to1 listed pseudogene which theoretically would allow me to target endogenous genes of different copy number and get some type of standard curve. This is assuming equal efficiency etc.

I didn’t pay attention to the column "Identity" but now I’m thinking I can sort out genes based on high identity and try again?

A3:
I think that identity should be taken into account when you are creating the standard curse. Also, note that in the excel file, there is a column of fraction (after gene ID), which indicates the fraction of a parent gene aligned to its pseudogene. The start and end coordinates of an alignment are also in the excel file (columns between protein ID and gene ID). Maybe you want to take these into consideration too.

Pseudogene minilist for PCR.xlsx

Comparing chromatin state analysis at pseudogene regions

Q:
I am very interested to compare our chromatin state analysis at the pseudogene regions. I found this file at your website: http://www.pseudogene.org/psidr/psiDR.v0.txt

Could you please let me know if this is the right place to compare? I saw you do have h1-esc there. If I understand correctly, you classified each pseudogene as being in either active (1) or silent state (0).

A:
The chromatin state, promoter prediction and pol2 binding regarding to pseudogenes in H1-hesc are included in the psiDR file. Please let me know if you have any questions about that file.

Pseudogene database: the link “current human pseudogenes” on the main webpage leads to build 61

Q:
I have a question regarding your Pseudogene database: the link "current
human pseudogenes" on the main webpage leads to build 61. Looking however at
"Database" -"Eukaryote Pseudogenes" I found build 68 for human
pseudogenes. The latter seems to contain less pseudogenes than build 61
(lower count). So I’m not sure which one I should best consider. Probably
build 68 is the latest version and the link on the main page is not up to
date, right?

A:
Now the link is pointing to build 68. I would
suggest you to use this file, which is the latest results based on the
release-68 of Ensembl genomes. The number of pseudogene changes due to
the different annotation of protein coding genes between the different
genome releases.

Data associated with paper “The GENCODE pseudogene resource”

Q:
Your work on the ENCODE project has helped to
produce an incredible set of data!

I had a question about your pseudogene article, "The GENCODE
pseudogene resource." You note that at least 9% of them are
transcribed. Do you have a list somewhere? I couldn’t find a
supplementary file that might contain such a list. I realize it would
be quite long, but I assume it must exist somewhere. If not, do you
happen to know if the GULO pseudogene is one of the transcribed
pseudogenes?

A:
It transcribes pseudogenes should be available from the resource associated with the paper.

The data associated with the paper is located at http://pseudogene.org/psidr/