Difference between revisions of "Task 7: Research SNPs"
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− | |+ style="caption-side: bottom; text-align: left" |<font size=2>'''Table |
+ | |+ style="caption-side: bottom; text-align: left" |<font size=2>'''Table 6:''' Mutations from OMIM that are associated with the HFE protein . |
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</figtable> |
</figtable> |
Revision as of 00:18, 2 September 2013
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Contents
HGMD (The Human Gene Mutation Database)
The search results for the HFE gene contain the different types of mutations that are specified in <xr id="hgmd"/>:
<figtable id="hgmd">
mutation type | definition | number |
---|---|---|
missense, nonsense | mutation that leads to a change of amino acid or a stop codon | 28 |
splicing | mutation that affects mRNA splicing | 3 |
regulatory | substitiution causing abnormal regulation | 1 |
small deletion | micro deletion (<= 20 bp) | 4 |
small insertion | micro insertions (<= 20 bp) | 1 |
small indel | micro indels (<= 20 bp) | 0 |
gross deletion | delition > 20 bp | 2 |
gross insertions/duplications | insertion > 20bp | 0 |
complex rearrangments | rearrangements of stretches of the DNA sequence | 1 |
repeat variations | differences in repeat length | 0 |
</figtable>
In total, we found 40 mutation in the public version of the database and 49 in the non-public version.
<figtable id="hgmd missense">
accession number | codon change | aa change | codon number |
---|---|---|---|
CM032270 | AGGc-AGC | Arg-Ser | 6 |
CM091838 | TTG-TGG | Leu-Trp | 46 |
CM994469 | cGTG-ATG | Val-Met | 53 |
CM994470 | cGTG-ATG | Val-Met | 59 |
HM971246 | CATg-CAC | His-His | 63 |
CM960827 | tCAT-GAT | His-Asp | 63 |
CM990718 | gAGT-TGT | Ser-Cys | 65 |
CM033969 | tCGC-TGC | Arg-Cys | 66 |
CM020721 | cCGA-TGA | Arg-Term | 71 |
CM990719 | aGGG-CGG | Gly-Arg | 93 |
CM990720 | ATT-ACT | Ile-Thr | 105 |
CM990721 | CAAg-CAC | Gln-His | 127 |
CM091839 | aGAC-AAC | Asp-Asn | 129 |
CM091840 | TACg-TAG | Tyr-Term | 138 |
CM004810 | gGAG-CAG | Glu-Gln | 168 |
CM004106 | gGAG-TAG | Glu-Term | 168 |
CM004107 | TGG-TAG | Trp-Term | 169 |
CM015326 | GCC-GTC | Ala-Val | 176 |
CM081301 | CTG-CCG | Leu-Pro | 183 |
CM034097 | CGG-CAG | Arg-Gln | 224 |
CM101181 | cCAG-TAG | Gln-Term | 233 |
CM024530 | tGTA-TTA | Val-Leu | 272 |
CM994771 | aGAG-AAG | Glu-Lys | 277 |
CM960828 | TGC-TAC | Cys-Tyr | 282 |
CM004391 | TGC-TCC | Cys-Ser | 282 |
CM032271 | CAG-CCG | Gln-Pro | 283 |
HM030028 | GTG-GCG | Val-Ala | 295 |
CM990722 | AGG-ATG | Arg-Met | 330 |
</figtable>
The 28 missense and nonsense mutations for HFE are listed in <xr id="hgmd missense"/> together with the amino acid (aa) change and the codon number. They are all connected with the hemochromatosis phenotype.
dbSNP
dbSNP was searched for non-synonymous and silent (synonymous) mutations of the HFE gene. Silent mutations are mutations in the nucleotide sequence that do not lead to a change in the amino acid sequence of the protein.
<figtable id="dbSNP all">
cluster ID | Function | codon number | codon pos | nucleotide change | aa change |
---|---|---|---|---|---|
rs149342416 | missense | 6 | 3 | G -> C | Arg -> Ser |
rs114758821 | synonymous | 7 | 3 | G -> A | Pro -> Pro |
rs368895240 | synonymous | 10 | 3 | C -> T | Leu -> Leu |
rs201657128 | missense | 14 | 1 | C -> G | Leu -> Val |
rs143662783 | missense | 17 | 2 | C -> T | Thr -> Ile |
rs148161858 | missense | 23 | 2 | G -> A | Arg -> His |
rs2242956 | missense | 35 | 2 | T -> C | Met -> Thr |
rs377254261 | missense | 37 | 2 | C -> T | Ala -> Val |
rs147297176 | synonymous | 58 | 3 | C -> T | Phe -> Phe |
rs147426902 | synonymous | 63 | 3 | T -> C | His -> His |
rs139523708 | missense | 67 | 2 | G -> A | Arg -> His |
rs62625342 | synonymous | 76 | 3 | C -> T | Ser -> Ser |
rs376650371 | missense | 97 | 3 | G -> A | Met -> Ile |
rs199988202 | missense | 106 | 2 | T -> C | Met -> Thr |
rs200706856 | missense | 129 | 1 | G -> A | Asp -> Asn |
rs201885016 | missense | 130 | 2 | A -> G | Asn -> Ser |
rs369790080 | synonymous | 132 | 3 | C -> T | Thr -> Thr |
rs372789940 | missense | 141 | 1 | G -> A | Asp -> Asn |
rs199879669 | missense | 157 | 1 | G -> C | Ala -> Pro |
rs145475682 | missense | 162 | 1 | G -> T | Ala -> Ser |
rs148480830 | synonymous | 162 | 3 | C -> G | Ala -> Ala |
rs144170531 | missense | 166 | 1 | A -> G | Lys -> Glu |
rs146519482 | missense | 168 | 1 | G -> C | Glu -> Gln |
rs199916850 | missense | 183 | 2 | T -> C | Leu -> Pro |
rs140957442 | nonsense | 192 | 1 | C -> T | Gln -> [Te |
rs4986950 | missense | 217 | 2 | C -> T | Thr -> Ile |
rs144797937 | missense | 224 | 1 | C -> T | Arg -> Trp |
rs62625346 | missense | 224 | 2 | G -> A | Arg -> Gln |
rs140515012 | missense | 245 | 1 | C -> G | Pro -> Ala |
rs150402693 | missense | 251 | 3 | C -> A | Phe -> Leu |
rs182920795 | synonymous | 253 | 3 | T -> A | Pro -> Pro |
rs202068193 | missense | 256 | 1 | G -> A | Val -> Ile |
rs143846467 | missense | 259 | 2 | A -> G | Asn -> Ser |
rs140080192 | missense | 277 | 1 | G -> A | Glu -> Lys |
rs369354634 | synonymous | 281 | 3 | G -> A | Thr -> Thr |
rs201310322 | synonymous | 292 | 3 | C -> T | Pro -> Pro |
rs143175221 | missense | 295 | 2 | T -> C | Val -> Ala |
rs114038675 | synonymous | 298 | 3 | G -> A | Glu -> Glu |
rs372856303 | synonymous | 301 | 3 | G -> A | Pro -> Pro |
rs147519426 | missense | 315 | 2 | T -> G | Val -> Gly |
rs148632352 | synonymous | 315 | 3 | T -> C | Val -> Val |
rs371192232 | synonymous | 317 | 3 | C -> T | Val -> Val |
rs141229562 | missense | 318 | 1 | G -> A | Val -> Ile |
rs150716212 | missense | 322 | 2 | T -> C | Ile -> Thr |
rs138993448 | missense | 327 | 2 | T -> C | Ile -> Thr |
rs368122334 | missense | 340 | 2 | G -> C | Gly -> Ala |
rs35201683 | synonymous | 342 | 3 | C -> T | Tyr -> Tyr |
rs370285936 | missense | 343 | 2 | T -> A | Val -> Asp |
rs146508927 | missense | 347 | 2 | G -> A | Arg -> His |
</figtable>
In total, we found 49 SNPs in the transcript variant 1 of the HFE gene. They are listed in <xr id="dbSNP all"/>. The column "Function" states if the mutation is synonymous or non-synonymous.
SNPdbe
35 mutations that are associated with the human HFE protein were found in SNPdbe.
<figtable id="exp evidence">
exp. evidence | count |
---|---|
1000Genome,freq,cluster | 6 |
by cluster | 6 |
by cluster,freq | 2 |
Not validated | 13 |
by freq | 8 |
</figtable>
Not all mutations have experimental evidence, over one third is not validated, see <xr id="exp evidence"/>.
<figtable id="snpdbe">
dbSNP | Mutation | Disease association | Experimental evidence |
---|---|---|---|
rs1799945 | H63D | In hereditary haemochromatosis (HH) (PMD) | 1000Genome,freq,cluster |
rs1800562 | C282Y | hemochromatosis (SwissVar) | 1000Genome,freq,cluster |
rs1800730 | S65C | hemochromatosis (SwissVar). In hereditary hemochromatosis patient who had resulted positive to screening for iron overload (PMD) | 1000Genome,freq,cluster |
rs2242956 | M35T | N/A | by cluster |
rs4986950 | T217I | N/A | by cluster,freq |
rs28934595 | Q127H | hemochromatosis (SwissVar). In variegate porphyria (VP) (PMD) | by cluster |
rs28934596 | I105T | hemochromatosis (SwissVar). In hemochromatosis (PMD) | by cluster |
rs28934597 | G93R | hemochromatosis (SwissVar). In hemochromatosis (PMD) | by cluster |
rs28934889 | V53M | N/A | 1000Genome,freq,cluster |
rs62625346 | R224Q | N/A | by cluster,freq |
rs28934890 | V59M | N/A | Not validated |
rs111033558 | R330M | hemochromatosis (SwissVar). In hereditary haemochromatosis (HH) (PMD) | by cluster |
rs111033563 | Q283P | hemochromatosis (SwissVar) | by cluster |
rs149342416 | R6S | hemochromatosis (SwissVar) | by freq |
rs140080192 | E277K | N/A | 1000Genome,freq,cluster |
rs143175221 | V295A | hemochromatosis (SwissVar) | by freq |
rs148161858 | R23H | N/A | 1000Genome,freq,cluster |
N/A | M106T | N/A | Not validated |
rs146519482 | E168Q | N/A | Not validated |
N/A | L183P | N/A | Not validated |
rs138176635 | E252G | N/A | Not validated |
rs138993448 | I327T | N/A | Not validated |
rs139523708 | R67H | N/A | Not validated |
rs140515012 | P245A | N/A | Not validated |
rs141229562 | V318I | N/A | Not validated |
rs143662783 | T17I | N/A | by freq |
rs143846467 | N259S | N/A | Not validated |
rs144170531 | K166E | N/A | by freq |
rs144797937 | R224W | N/A | by freq |
rs145475682 | A162S | N/A | by freq |
rs146508927 | R347H | N/A | by freq |
rs147519426 | V315G | N/A | by freq |
rs149662565 | P160T | N/A | Not validated |
rs150402693 | F251L | N/A | Not validated |
rs150716212 | I322T | N/A | Not validated |
</figtable>
A list of the 35 mutations and their experimental evidence can be found in <xr id="snpdbe"/>.
OMIM
OMIM (Online Mendelian Inheritance in Man) also contains information about HFE, but only a small amount of all known mutations can be found.
<figtable id="omim">
dbSNP accession | Phenotype | Mutation |
---|---|---|
rs1799945 | HEMOCHROMATOSIS | HIS63ASP |
rs1800730 | HEMOCHROMATOSIS | SER65CYS |
rs28934889 | HFE POLYMORPHISM | VAL53MET |
rs28934595 | HEMOCHROMATOSIS | GLN127HIS |
rs111033558 | HEMOCHROMATOSIS | ARG330MET |
rs28934596 | HEMOCHROMATOSIS | ILE105THR |
rs28934597 | HEMOCHROMATOSIS | GLY93ARG |
rs111033563 | HEMOCHROMATOSIS | GLN283PRO |
</figtable>
A complete list of the mutations can be found in <xr id="omim"/>. Two of the mutations are poylmorphisms of the HFE protein and 8 of them cause the disease hemochromatosis.
Databases comparison
<figtable id="comparison">
database | last update | version | what information | where from | # entries homo sapiens | # HFE mutations |
---|---|---|---|---|---|---|
HGMD | spring 2013 | public 2013.1 (mainly 3 year old data) | Collection of published gene lesions in the human genome that cause inherited diseases. | Only from publications. Journals are searched manually and by computational means each week. | 99869 | 28 missense/nonsense |
dbSNP | 26.06.2012 | Build 137 | Short nucleotide sequence variations in different organisms (common and rare) | Submissions from laboratories but also private research companies. | 192,678,553 | 10 synonymous, 41 non-synonymous, 10 disease causing SNPs and 162 SNPs in the UTR |
SNPdbe | 05.03.2012 | - | Annotations for single amino acid substitutions (SAASs), e.g. functional effect (experimental, predicted), associated disease, evol. conservation,... | Based on entries from SwissProt, dbSNP, 1000 Genomes, PMD | 967879 | 10 disease associated, 25 other |
OMIM | daily | - | Compendium of human genes, genetic phenotypes and diseases. 3,035 genes with phenotype-causing mutations known. | Information from publications and databases is reviewed and summed up in texts by scientists. | 21,934 | 2 8 disease causing mutations, 2 other |
</figtable>
<xr id="comparison"/> contains a comparison of the four databases used in this task. It clearly shows that OMIM is most up to date and also the private version of HGMD is from 2013, but dbSNP, SNPdbe and execially the public HGMD have not been updated for over a year. dbSNP is very large and is the only database that also contains synonymous SNPs.
Mutation map
In total, we could collect a set of 72 point mutations from the different databases, containing missense, nonsense mutations and also synonymous SNPs. The complete list can be viewed in the Lab journal Task 7.
<figure id="mutation map">
</figure>
<xr id="mutation map"/> shows the mutation map for HFE. Disease causing mutations (red) and non disease causing mutations (blue) are nearly equally distributed over the protein sequence. Nevertherless, there are some region where only dc mutation are located. Those regions are probably especially relevant for the protein function and can not be mutated without a dicrease in function.
<figtable id="mutations struc">
</figtable>
In addition to the mutation map, <xr id="mutations struc"/> shows a 3D visualisation of the location of the mutated amin acids in the protein structure (1A6Z,A). Most disease causing mutations are located in secondary structure regions, but there are also some mutations that are located in loops. Therefore, it is difficult to tell which regions of the structure are important for the function when only looking at the the location of the mutations.
References
Stenson et al (2009), The Human Gene Mutation Database (HGMD®): 2008 Update. Genome Med 1(1):13
http://www.ncbi.nlm.nih.gov/books/NBK3848/
ftp://ftp.ncbi.nih.gov/pub/factsheets/Factsheet_SNP.pdf
https://www.rostlab.org/services/snpdbe/