Greetings GenBank Users,
GenBank Release 206.0 is now available via FTP from the National Center
for Biotechnology Information (NCBI):
Ftp Site Directory Contents
---------------- --------- ---------------------------------------
ftp.ncbi.nih.gov genbank GenBank Release 206.0 flatfiles
ncbi-asn1 ASN.1 data used to create Release 206.0
Close-of-data for GenBank 206.0 occurred on 02/13/2015. Uncompressed,
the Release 206.0 flatfiles require roughly 700 GB (sequence files only).
The ASN.1 data require approximately 572 GB.
Recent statistics for non-WGS, non-CON sequences:
Release Date Base Pairs Entries
205 Dec 2014 184938063614 179295769
206 Feb 2015 187893826750 181336445
Recent statistics for WGS sequences:
Release Date Base Pairs Entries
205 Dec 2014 848977922022 200301550
206 Feb 2015 873281414087 205465046
Recent statistics for TSA sequences:
205 Dec 2014 46056420903 62635617
206 Feb 2015 49765340047 66706014
During the 63 days between the close dates for GenBank Releases 205.0
and 206.0, the non-WGS/CON/TSA portion of GenBank grew by 2,955,763,136
basepairs and by 2,040,676 sequence records. During that same period,
164,936 records were updated. An average of 35,010 non-WGS/non-CON
records were added and/or updated per day.
Between releases 205.0 and 206.0, the WGS component of GenBank grew by
24,303,492,065 basepairs and by 5,163,496 sequence records.
Between releases 205.0 and 206.0, the TSA component of GenBank grew by
3,708,919,144 basepairs and by 4,070,397 sequence records.
For additional release information, see the README files in either of
the directories mentioned above, and the release notes (gbrel.txt) in
the genbank directory. Sections 1.3 and 1.4 of the release notes
(Changes in Release 206.0 and Upcoming Changes) have been appended
below for your convenience.
* * * Important * * *
A significant change is described in Section 1.4.1 of the release
notes: an anticipated phasing-out of NCBI GI sequence identifiers.
Users who make use of GIs in their information systems and analysis
pipelines should take particular note of that section.
Release 206.0 data, and subsequent updates, are available now via
NCBI's Entrez and Blast services.
As a general guideline, we suggest first transferring the GenBank
release notes (gbrel.txt) whenever a release is being obtained. Check
to make sure that the date and release number in the header of the
release notes are current (eg: February 15 2015, 206.0). If they are
not, interrupt the remaining transfers and then request assistance from
the NCBI Service Desk.
A comprehensive check of the headers of all release files after your
transfers are complete is also suggested. Here's how one might go about
this on a Unix or Linux platform, using csh/tcsh :
set files = `ls gb*.*`
foreach i ($files)
head -10 $i | grep Release
Or, if the files are compressed, perhaps:
gzcat $i | head -10 | grep Release
If you encounter problems while ftp'ing or uncompressing Release
206.0, please send email outlining your difficulties to:
info from ncbi.nlm.nih.gov
Mark Cavanaugh, Michael Kimelman, Ilya Dondoshansky, Sergey Zhdanov,
1.3 Important Changes in Release 206.0
1.3.1 Organizational changes
The total number of sequence data files increased by 46 with this release:
- the BCT division is now composed of 169 files (+10)
- the CON division is now composed of 303 files (+11)
- the ENV division is now composed of 80 files (+2)
- the GSS division is now composed of 293 files (+4)
- the INV division is now composed of 133 files (+1)
- the PAT division is now composed of 217 files (+3)
- the PLN division is now composed of 96 files (+1)
- the TSA division is now composed of 172 files (+13)
- the VRT division is now composed of 45 files (+1)
1.3.2 GSS File Header Problem
GSS sequences at GenBank are maintained in two different systems, depending
on their origin, and the dumps from those systems occur in parallel. Because
the second dump (for example) has no prior knowledge of exactly how many GSS
files will be dumped by the first, it does not know how to number its own
There is thus a discrepancy between the filenames and file headers for 125
of the GSS flatfiles in Release 206.0. Consider gbgss169.seq :
GBGSS1.SEQ Genetic Sequence Data Bank
February 15 2015
NCBI-GenBank Flat File Release 206.0
GSS Sequences (Part 1)
87049 loci, 63866074 bases, from 87049 reported sequences
Here, the filename and part number in the header is "1", though the file
has been renamed as "169" based on the number of files dumped from the other
system. We hope to resolve this discrepancy at some point, but the priority
is certainly much lower than many other tasks.
1.4 Upcoming Changes
1.4.1 GI sequence identifiers to be phased out (slowly!) at NCBI
The numeric GI sequence identifier that NCBI assigns to all nucleotide
and protein sequences was first introduced for GenBank Release products
as of GenBank 81.0, in February 1994. See:
These simple, uniform, integer-based unique identifiers (which predated the
introduction of Accession.Version sequence identifiers) were crucial to the
development of NCBI's Entrez retrieval system, and have served their purpose
very well for nearly 20 years.
However, as NCBI considers how best to address the expected increase in the
volume of submitted sequence data, it is clear that prior practices will need
to be re-thought. As an example, imagine 100,000 pathogen-related
genomes/samples, each with 5000 proteins, most of which are common to all. We
will be moving toward solutions that represent each unique protein *once*.
The coding region protein products for each genome will likely continue to be
assigned their own Accession.Version identifiers, but (within the NCBI data
model) they will simply *reference* the unique proteins. And, they will no
longer be issued GIs of their own.
Such a change will likely have a significant impact on NCBI users who utilize
GIs in their own information systems and analysis pipelines, so it will not be
introduced quickly. You can expect that a great deal of additional detail will
be made available via NCBI's various announcement mechanisms.
*This* particular announcement is chiefly intended to provide some advance
warning to our users. There _will_ be classes of GenBank sequences that
are not assigned GIs in the not-too-distant future. If GIs are central to
your operations, then it might be appropriate to begin planning a switch to
the use of Accession.Version identifiers instead.
And in fact, NCBI now has several WGS submissions for which GIs have
not been assigned, for both the contigs and the scaffolds.
For example: Here are excerpts of the flatfile representation for the
first ALWZ02 (second assembly-version of the ALWZ project) contig, and the
'singleton' scaffold which is constructed from it:
LOCUS ALWZ020000001 701 bp DNA linear PLN 28-MAY-2013
DEFINITION Picea glauca contig316_0, whole genome shotgun sequence.
ACCESSION ALWZ020000001 ALWZ020000000
DBLINK BioProject: PRJNA83435
1 cgttgtgttg gggcacccaa ccttggtgag gccgtattaa aaagtctacc tccaagccaa
61 aatttgttct tatccatcct ccaactcgtc tttttgccta gtgctcccct atgtggacgt
121 tttcgttgtg gaggagtttt tcgtttgggc gcccatcttg cgaactcacc ttgcattgcg
181 tttggtcgcc caacttgtga acgtgccttg gattgcgttg gggcgcccaa gttgcggacg
241 tgcggacgtg cctttctttg ccgacatgcc ttgcgtttgc gttgcggacg tgcaatgggg
301 cccccagctt gctgacgtgc cttgcgttgc gttggggtgc ccaacttgcc gacgtgcctt
361 gcgttgcgtt ggggcaccca accttggtga ggccgtatta aaaagtctac ctccaagata
421 aaatttgttc ttatccatcc tctagctctt cttttagcct agtgctccct tgtgtggaca
481 ttttcgttgt ggatcatttt ttcgtttagg tgcccatctt gcagacaagc cttgcgttgc
541 gtttgggcac ccatcttgcg gacgcgcctt tcattgcgtt ggggcgccca acgttggtga
601 ggccgtatta aaaagtctac ctccaagaca aaatttgttc ttatccatcc tccatctcgt
661 ctttttgcct agtgctccct tgtgtggacg ttttcgttgc g
LOCUS ALWZ02S0000001 701 bp DNA linear CON 14-JUN-2013
DEFINITION Picea glauca scaffold316, whole genome shotgun sequence.
ACCESSION ALWZ02S0000001 ALWZ000000000
DBLINK BioProject: PRJNA83435
**Note the absence of a GI value on the VERSION line of these two records**
Sample URLs from which ALWZ02 data may be obtained include:
Unannotated WGS projects consisting of many millions of contigs and
scaffolds represent the first class of records for which GIs are no
longer being assigned. But the practice will ultimately expand to
include other classes of records.