b53ca06391134031e25470547b8a2cbfe34c6f85
jnavarr5
Tue Feb 11 09:54:55 2020 -0800
Updating redirected links found for galGal5, uiLinks cronjob.
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Interpreting and Configuring the Graphical Display
Variants are shown as single tick marks at most zoom levels.
When viewing the track at or near base-level resolution, the displayed
width of the SNP corresponds to the width of the variant in the reference
sequence. Insertions are indicated by a single tick mark displayed between
two nucleotides, single nucleotide polymorphisms are displayed as the width
of a single base, and multiple nucleotide variants are represented by a
block that spans two or more bases.
On the track controls page, SNPs can be colored and/or filtered from the
display according to several attributes:
-
Class: Describes the observed alleles
- Single - single nucleotide variation: all observed alleles are single nucleotides
(can have 2, 3 or 4 alleles)
- In-del - insertion/deletion
- Heterozygous - heterozygous (undetermined) variation: allele contains string '(heterozygous)'
- Microsatellite - the observed allele from dbSNP is a variation in counts of short tandem repeats
- Named - the observed allele from dbSNP is given as a text name instead of raw sequence, e.g., (Alu)/-
- No Variation - the submission reports an invariant region in the surveyed sequence
- Mixed - the cluster contains submissions from multiple classes
- Multiple Nucleotide Polymorphism (MNP) - the alleles are all of the same length, and length > 1
- Insertion - the polymorphism is an insertion relative to the reference assembly
- Deletion - the polymorphism is a deletion relative to the reference assembly
- Unknown - no classification provided by data contributor
-
Validation: Method used to validate
the variant (each variant may be validated by more than one method)
- By Frequency - at least one submitted SNP in cluster has frequency data submitted
- By Cluster - cluster has at least 2 submissions, with at least one submission assayed with a non-computational method
- Unknown - no validation has been reported for this variant
-
Function: dbSNP's predicted functional effect of variant on RefSeq transcripts,
both curated (NM_* and NR_*) as in the RefSeq Genes track and predicted (XM_* and XR_*),
not shown in UCSC Genome Browser.
A variant may have more than one functional role if it overlaps
multiple transcripts.
These terms and definitions are from the Sequence Ontology (SO); click on a term to view it in the
MISO Sequence Ontology Browser.
- Unknown - no functional classification provided (possibly intergenic)
- synonymous_variant -
A sequence variant where there is no resulting change to the encoded amino acid
(dbSNP term: coding-synon)
- intron_variant -
A transcript variant occurring within an intron
(dbSNP term: intron)
- downstream_gene_variant -
A sequence variant located 3' of a gene
(dbSNP term: near-gene-3)
- upstream_gene_variant -
A sequence variant located 5' of a gene
(dbSNP term: near-gene-5)
- nc_transcript_variant -
A transcript variant of a non coding RNA gene
(dbSNP term: ncRNA)
- stop_gained -
A sequence variant whereby at least one base of a codon is changed, resulting in
a premature stop codon, leading to a shortened transcript
(dbSNP term: nonsense)
- missense_variant -
A sequence variant, where the change may be longer than 3 bases, and at least
one base of a codon is changed resulting in a codon that encodes for a
different amino acid
(dbSNP term: missense)
- stop_lost -
A sequence variant where at least one base of the terminator codon (stop)
is changed, resulting in an elongated transcript
(dbSNP term: stop-loss)
- frameshift_variant -
A sequence variant which causes a disruption of the translational reading frame,
because the number of nucleotides inserted or deleted is not a multiple of three
(dbSNP term: frameshift)
- inframe_indel -
A coding sequence variant where the change does not alter the frame
of the transcript
(dbSNP term: cds-indel)
- 3_prime_UTR_variant -
A UTR variant of the 3' UTR
(dbSNP term: untranslated-3)
- 5_prime_UTR_variant -
A UTR variant of the 5' UTR
(dbSNP term: untranslated-5)
- splice_acceptor_variant -
A splice variant that changes the 2 base region at the 3' end of an intron
(dbSNP term: splice-3)
- splice_donor_variant -
A splice variant that changes the 2 base region at the 5' end of an intron
(dbSNP term: splice-5)
In the Coloring Options section of the track controls page,
function terms are grouped into several categories, shown here with default colors:
-
Molecule Type: Sample used to find this variant
- Genomic - variant discovered using a genomic template
- cDNA - variant discovered using a cDNA template
- Unknown - sample type not known
-
Unusual Conditions (UCSC): UCSC checks for several anomalies
that may indicate a problem with the mapping, and reports them in the
Annotations section of the SNP details page if found:
- AlleleFreqSumNot1 - Allele frequencies do not sum
to 1.0 (+-0.01). This SNP's allele frequency data are
probably incomplete.
- DuplicateObserved,
MixedObserved - Multiple distinct insertion SNPs have
been mapped to this location, with either the same inserted
sequence (Duplicate) or different inserted sequence (Mixed).
- FlankMismatchGenomeEqual,
FlankMismatchGenomeLonger,
FlankMismatchGenomeShorter - NCBI's alignment of
the flanking sequences had at least one mismatch or gap
near the mapped SNP position.
(UCSC's re-alignment of flanking sequences to the genome may
be informative.)
- MultipleAlignments - This SNP's flanking sequences
align to more than one location in the reference assembly.
- NamedDeletionZeroSpan - A deletion (from the
genome) was observed but the annotation spans 0 bases.
(UCSC's re-alignment of flanking sequences to the genome may
be informative.)
- NamedInsertionNonzeroSpan - An insertion (into the
genome) was observed but the annotation spans more than 0
bases. (UCSC's re-alignment of flanking sequences to the
genome may be informative.)
- NonIntegerChromCount - At least one allele
frequency corresponds to a non-integer (+-0.010000) count of
chromosomes on which the allele was observed. The reported
total sample count for this SNP is probably incorrect.
- ObservedContainsIupac - At least one observed allele
from dbSNP contains an IUPAC ambiguous base (e.g., R, Y, N).
- ObservedMismatch - UCSC reference allele does not
match any observed allele from dbSNP. This is tested only
for SNPs whose class is single, in-del, insertion, deletion,
mnp or mixed.
- ObservedTooLong - Observed allele not given (length
too long).
- ObservedWrongFormat - Observed allele(s) from dbSNP
have unexpected format for the given class.
- RefAlleleMismatch - The reference allele from dbSNP
does not match the UCSC reference allele, i.e., the bases in
the mapped position range.
- RefAlleleRevComp - The reference allele from dbSNP
matches the reverse complement of the UCSC reference
allele.
- SingleClassLongerSpan - All observed alleles are
single-base, but the annotation spans more than 1 base.
(UCSC's re-alignment of flanking sequences to the genome may
be informative.)
- SingleClassZeroSpan - All observed alleles are
single-base, but the annotation spans 0 bases. (UCSC's
re-alignment of flanking sequences to the genome may be
informative.)
Another condition, which does not necessarily imply any problem,
is noted:
- SingleClassTriAllelic, SingleClassQuadAllelic -
Class is single and three or four different bases have been
observed (usually there are only two).
-
Miscellaneous Attributes (dbSNP): several properties extracted
from dbSNP's SNP_bitfield table
(see dbSNP_BitField_v5.pdf for details)
- Clinically Associated (human only) - SNP is in OMIM and/or at
least one submitter is a Locus-Specific Database. This does
not necessarily imply that the variant causes any disease,
only that it has been observed in clinical studies.
- Appears in OMIM/OMIA - SNP is mentioned in
Online Mendelian Inheritance in Man for
- human SNPs, or Online Mendelian Inheritance in Animals for
non-human animal SNPs. Some of these SNPs are quite common,
others are known to cause disease; see OMIM/OMIA for more
information.
- Has Microattribution/Third-Party Annotation - At least
one of the SNP's submitters studied this SNP in a biomedical
setting, but is not a Locus-Specific Database or OMIM/OMIA.
- Submitted by Locus-Specific Database - At least one of
the SNP's submitters is associated with a database of variants
associated with a particular gene. These variants may or may
not be known to be causative.
- MAF >= 5% in Some Population - Minor Allele Frequency is
at least 5% in at least one population assayed.
- MAF >= 5% in All Populations - Minor Allele Frequency is
at least 5% in all populations assayed.
- Genotype Conflict - Quality check: different genotypes
have been submitted for the same individual.
- Ref SNP Cluster has Non-overlapping Alleles - Quality
check: this reference SNP was clustered from submitted SNPs
with non-overlapping sets of observed alleles.
- Some Assembly's Allele Does Not Match Observed -
Quality check: at least one assembly mapped by dbSNP has an allele
at the mapped position that is not present in this SNP's observed
alleles.
Several other properties do not have coloring options, but do have
some filtering options:
-
Average heterozygosity: Calculated by dbSNP as described in
Computation of Average
Heterozygosity and Standard Error for dbSNP RefSNP Clusters.
- Average heterozygosity should not exceed 0.5 for bi-allelic
single-base substitutions.
-
Weight: Alignment quality assigned by dbSNP
- Weight can be 0, 1, 2, 3 or 10.
- Weight = 1 are the highest quality alignments.
- Weight = 0 and weight = 10 are excluded from the data set.
- A filter on maximum weight value is supported, which defaults to 1
on all tracks except the Mult. SNPs track, which defaults to 3.
-
Submitter handles: These are short, single-word identifiers of
labs or consortia that submitted SNPs that were clustered into this
reference SNP by dbSNP (e.g., 1000GENOMES, ENSEMBL, KWOK). Some SNPs
have been observed by many different submitters, and some by only a
single submitter (although that single submitter may have tested a
large number of samples).
-
AlleleFrequencies: Some submissions to dbSNP include
allele frequencies and the study's sample size
(i.e., the number of distinct chromosomes, which is two times the
number of individuals assayed, a.k.a. 2N). dbSNP combines all
available frequencies and counts from submitted SNPs that are
clustered together into a reference SNP.
You can configure this track such that the details page displays
the function and coding differences relative to
particular gene sets. Choose the gene sets from the list on the SNP
configuration page displayed beneath this heading: On details page,
show function and coding differences relative to.
When one or more gene tracks are selected, the SNP details page
lists all genes that the SNP hits (or is close to), with the same keywords
used in the function category. The function usually
agrees with NCBI's function, except when NCBI's functional annotation is
relative to an XM_* predicted RefSeq (not included in the UCSC Genome
Browser's RefSeq Genes track) and/or UCSC's functional annotation is
relative to a transcript that is not in RefSeq.
Insertions/Deletions
dbSNP uses a class called 'in-del'. We compare the length of the
reference allele to the length(s) of observed alleles; if the
reference allele is shorter than all other observed alleles, we change
'in-del' to 'insertion'. Likewise, if the reference allele is longer
than all other observed alleles, we change 'in-del' to 'deletion'.
UCSC Re-alignment of flanking sequences
dbSNP determines the genomic locations of SNPs by aligning their flanking
sequences to the genome.
UCSC displays SNPs in the locations determined by dbSNP, but does not
have access to the alignments on which dbSNP based its mappings.
Instead, UCSC re-aligns the flanking sequences
to the neighboring genomic sequence for display on SNP details pages.
While the recomputed alignments may differ from dbSNP's alignments,
they often are informative when UCSC has annotated an unusual condition.
Non-repetitive genomic sequence is shown in upper case like the flanking
sequence, and a "|" indicates each match between genomic and flanking bases.
Repetitive genomic sequence (annotated by RepeatMasker and/or the
Tandem Repeats Finder with period >= 12) is shown in lower case, and matching
bases are indicated by a "+".
Data Sources and Methods
The data that comprise this track were extracted from database dump files
and headers of fasta files downloaded from NCBI.
The database dump files were downloaded from
ftp://ftp.ncbi.nlm.nih.gov/snp/organisms/chicken_9031/database/organism_data/
for galGal5
The fasta files were downloaded from
ftp://ftp.ncbi.nlm.nih.gov/snp/organisms/chicken_9031/rs_fasta/
for galGal5.
- Coordinates, orientation, location type and dbSNP reference allele data
were obtained from b147_SNPContigLoc.bcp.gz and
b147_ContigInfo.bcp.gz.
- b147_SNPMapInfo.bcp.gz provided the alignment weights.
- Functional classification was obtained from
b147_SNPContigLocusId.bcp.gz. The internal database representation
uses dbSNP's function terms, but for display in SNP details pages,
these are translated into
Sequence Ontology terms.
- Validation status and heterozygosity were obtained from SNP.bcp.gz.
- SNPAlleleFreq.bcp.gz and ../shared/Allele.bcp.gz provided allele frequencies.
For the human assembly, allele frequencies were also taken from
SNPAlleleFreq_TGP.bcp.gz .
- Submitter handles were extracted from Batch.bcp.gz, SubSNP.bcp.gz and
SNPSubSNPLink.bcp.gz.
- SNP_bitfield.bcp.gz provided miscellaneous properties annotated by dbSNP,
such as clinically-associated. See the document
dbSNP_BitField_v5.pdf for details.
- The header lines in the rs_fasta files were used for molecule type,
class and observed polymorphism.
Data Access
The raw data can be explored interactively with the Table Browser,
Data Integrator, or Variant Annotation Integrator.
For automated analysis, the genome annotation can be downloaded from the downloads server
(snp147*.txt.gz) or the public MySQL server. Please refer to our
mailing list archives
for questions and example queries, or our Data Access FAQ for more information.
References
Sherry ST, Ward MH, Kholodov M, Baker J, Phan L, Smigielski EM, Sirotkin K.
dbSNP: the NCBI database of genetic variation.
Nucleic Acids Res. 2001 Jan 1;29(1):308-11.
PMID: 11125122; PMC: PMC29783