JSM Bioinformatics, Genomics and Proteomics

In silico analysis of Single Nucleotide Polymorphisms (SNPs) in Human HFE Gene coding region

Original Research | Open Access Volume 5 | Issue 1 |

  • 1. Department of Medical laboratory sciences, Sudan University of science and Technology, Sudan
  • 2. Department of Medical laboratory sciences, Al-Neelain University, Sudan
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Corresponding Authors
Anfal Ibrahim Bahereldeen, Department of medical laboratory sciences, Sudan University of Science and Technology, Khartoum, Sudan; Tel: 249916060120

Background: HFE gene is a HLA class1-like molecule, expressed in the different cells and tissues, mutations on this gene reported to cause about 80-90% of Hereditary haemochromatosis (HHC) and it is increasing the risk of different diseases. In this study; we aimed to analysis the SNPs in HFE gene by using different computational methods.

Methodology: We obtained HFE gene nsSNPs from dbSNP/NCBI database, Deleterious nsSNPs predicted by different bioinformatics servers including; SIFT, polyphen-2, I-mutant and SNPs & GO servers. Protein structure analysis done by using Project hope and RaptorX tools then visualized by Chimera software and function, interaction and network of HFE gene analysis done by Gene MANIA program.

Results: SIFT and Polyphen-2 servers predicted 75 deleterious nsSNPs and nine polymorphisms from them predicted as highly damaging and disease associated.

Conclusion: In silico analysis of single nucleotide polymorphisms is better for understanding different genetic disorders, and give helpful information for future candidate studies.


Bahereldeen AI, Alfadil RG, Ali HM, Nasser RM, Eisa NT, et al. (2020) In silico analysis of Single Nucleotide Polymorphisms (SNPs) in Human HFE Gene coding region. J Bioinform, Genomics, Proteomics 5(1): 1040


•    In silico
•    HFE gene, Polyphen-2
•    I mutant
•    Project hope


HFE: Human Factor Engineering, HHC: Hereditary Haemochromatosis; nsSNPs: Non-synonymous Single Nucleotide Polymorphism; dbSNPs: Single Nucleotide Polymorphism Database; NCBI: National Center of Bioinformatics; Polyphen: Polymorphism Phenotype; HLA: Human Leukocyte Antigen; GWAS: Genome-Wide Association Studies; CHD: Coronary Heart Disease; SNP: Single Nucleotide Polymorphism; DDG: Free Energy Change Value; RI: Reliability Index


Homeostatic iron regulator (HFE) gene on the short arm of the chromosome 6 in position 6p22.2 within the extended HLA class I region, encode for membrane protein, associated with beta-2 micro-globulin, this protein located on the surface of intestinal cells, liver cells and other cells, it interacts with different proteins to discover the iron levels [1-4]. Mutations in HFE gene associated with more than 80% of Hereditary haemochromatosis (HHC) disorder [1], HHC is an autosomal recessive disorder characterized by increasing iron absorption by the intestinal tract and abnormal deposition in parenchymal organs, without treatment, this condition can cause severe diseases [5,6]. Several genome-wide association studies (GWAS) performed to investigate the effect of HFE genes mutations on body iron concentration [7-10], HFE gene mutations were frequently found in patients suffering from one of the most common types of porphyria known as porphyria cutanea because of abnormal deposition of iron in the body may cause iron toxicity which cause an abnormal building up of porphyrins [11,12], also HFE gene variants increase the risk of; a coronary heart disease (CHD) [13], Alzheimer disease [14] and increase the risk of the hepatocellular carcinoma, breast cancer, colorectal cancer and others types of cancers [15-19].

Numbers of databases used to store the SNPs, like dbSNP Database from NCBI, which containing a large number of a discovered SNPs in a human genome and other domains [20], also tools such as SIFT, Polyphen2 and others used to analysis of functional and structural effects caused by the genetic polymorphisms and to study the roles of SNPs on various human diseases to help researchers and aid them in analysis and further studies of different diseases [21-27]. Therefore, this study focuses on analysis of non-synonymous missense SNPs of HFE gene by using computational tools to highlight deleterious mutations and to predict the structural and functional consequences of these polymorphisms.


We have obtained HFE gene SNPs from dbSNP database, one of the largest websites canting wide collection of single nucleotide variations, available at: http://www.ncbi.nlm.nih gov/snp and FAST format of the HFE proteins has obtained from ensemble database: https://feb2014.archive.ensembl.org then the analysis of single nucleotide polymorphisms done by using various Bioinformatics tools (Figure 1).

SIFT software [SIFT Predict effects of nonsynonymous/ missense variants]

One of the firsts online Bioinformatics website, available at; http://sift.bii.astar.edu.sg/, used to predict the effect of damage caused by SNPs in a particular gene, SIFT is working by taking a query sequence from protein sequence database and making several comparisons at the mutant amino acids to predict if this mutation tolerated or not depending on the specific score determined between 0-1 [21]. We have submitted dbSNP reference numbers (rs numbers) of HFE gene as batch into the server, the results with SIFT score of ≤ 0.05 predicated as deleterious and those with SIFT score > 0.05 predicted as tolerance.

PolyPhen-2[Polymorphism phenotyping v2]

Is a free online Bioinformatics website available at http:// genetics.bwh.harvard.edu/pph2/index.shtml, used to predict the effects of amino acids changing on the structural and function of the proteins, it depends on several proteomics databases to search for protein 3D structure and makes multiple alignments between the homologous sequences and newly-formed amino acid then determines the difference in amino acid properties and calculates the position-specific independent count scores (PSIC) for each substitution, which indicate the possibility of the damage [22]. We have submitted protein query sequence in FASTA format with each mutations position separately to the server then the results predicated as probably damaging if the PSIC score equal 2.00 or more, possibly damaging if PSIC score between (1.40–1.90), potentially damaging if PSIC score between (1.0–1.30) and benign when PSIC score between (0.00–0.90).

I-Mutant suite [I mutant 3.0]

Is an online Bioinformatics server available at http://gpcr2. biocomp.unibo.it/cgi/predictors/I-Mutant3.0/I-Mutant3.0.cgi, it depends on numbers of data set including; Gibbs frees energy change, enthalpy change, transition temperature and heat capacity change which obtained from thermodynamic databases, to predict the effect of the amino acid changed on protein stability and predication of their result depending on the reliability index (RI), which is ranging from (0-10) [28]. We have submitted HFE protein sequence and mutations to predict the effects of damaging nsSNPs on protein stability, all tests done at temperature 25C° and pH 7.0 and the results predicated as decrease or increase in protein stability.

SNPs & GO [SNPs&GO3d]: [predictor of Human Deleterious Single Nucleotide Polymorphisms]

Online database http://snps.biofold.org/snps-and-go/ snps-and-go.html, acts to drive collection of unique framework information about protein sequence, evolutionary information and function as encoded in the Gene Ontology terms, and automatically do other available tests methods to predicate if the change of amino acid on protein sequence was disease related or neutral [29,30]. We have submitted HFE protein sequence and mutations then selected all Methods to option the server to do predictions using S3D-PROF, SNPs & GO and PhD-SNPs methods.


Is a cytoscape server available at http://www.genemania.org, used for Function, interaction and network of gene analysis; it acts on numbers of functional association information including physical interactions, genetic interactions, pathways, co-expression, phylogenetic profiles, protein domain and other data obtained from the different biological database [31].

HFE protein 3D structure modeling and analysis programs

Project hope [Version0.4.1]: Is an online proteomic database developed at the center of molecular and biomolecular informatics (CMBI) at Radboud University in Nijmegen, the program available at http://www.cmbi.ru.nl/hope/, it works by obtaining structural information from different sites, including 3D structure of protein, sequence annotations in UniProt and predictions from DAS-servers, to analysis the impact of the amino acid change on the protein structure [32]. We have submitted nsSNPs that predicted as highly damaging by both SIFT and Polyphen-2 databases to project hope server as protein sequence in FASTA format with position of each mutation, native amino acid and the new substituent, than the server provided us with the complete report about the effect of each SNPs on the structure of HFE protein.

RaptorX [RaptorX Structure Prediction]: Online free server for protein structure and function prediction available at http://raotorx.uchicago.edu/ [33], we have submitted the HFE protein sequence into the RaptorX server, then it provided us with secondary and tertiary structures in addition to contact map, solvent accessibility, disordered regions, binding sites for the given sequence and reliability scores. The tertiary structures of HFE gene that was given by RaptorX treated by Chimera-1.12 Bioinformatic server which is the program of high quality used for visualization and investigation of molecular assemblies and related data, it designed by University of California, San Francisco (UCSF) available at: http://www.cgl.ucsf.edu/chimera [34].


Two missense mutations; C282Y (rs 1800562) and H63D (rs 1799945) reported as common HFE gene mutations, C282Y is the most common in Northern European populations and H63D has a global distribution and case about 40-70% HFE non-C282Y haemochromatosis, a new HFE amino acid variant S65C/rs1800730 that reported in position 193 of the HFE gene exon 2, is the third common HFE gene mutation involved in the pathogenesis of haemochromatosis [35-38]

In this study a total of 1443 Homo sapiens HFE gene SNPs, obtained from dbSNP/NCBI in September 2018 , for computational analysis; 163 SNPs of them were missense, 12 nonsenses, eight frame shift and 236 in 3’UTR, 31 in 5’UTR and the remaining were other types. We have selected only non-synonymous coding SNPs for our investigation.

Functional analysis of polymorphism in HFE gene coding region by using SIFT and Polyphen-2 servers

SIFT software predicted 84 deleterious SNPs, 75 nsSNPs of them predicated as damaging by Polyphen2 server and nine mutations identified as highly damaging by both servers, all the nine mutations were replacing the Cysteine residue to Tyrosine in different positions(194, 282, 102, 190, 176, 259, 279, 180, 268)/ (rs 1800562) (Table 1 and Appendix Table 1).

Note: All 84 nsSNPs that predicted as intolerant by SIFT server, used for farther investigation as fallow:

Prediction of the protein’ s stability by I MUATANT server

It results are 69 SNPs as decrease stability of HFE proteins (Appendix Table 2) and fifteen SNPs increase stability of HFE protein (Table 1 and Appendix Table 2).

Investigation of disease-mutations association

It done by PhD-SNP method that predicated 43 nsSNPs as disease associated and SNP&GO method that predicated only 27 nsSNPs as disease associated, all the highly damaging nine mutations on (rs 1800562) predicated as disease associated by both methods (Table 1 and Appendix Table 2).

Function, interaction and network of HFE gene analysis by using GeneMANIA software

Gene MANIA server detected that HFE gene was co-expressed with twenty genes and shares the same protein domain with seven of them (Figure 2 and Tables 2 and 3).

HFE protein 3D structure modelling

The effect of the amino acid changes on 3D structure of HFE protein ware explained by project hope software for all nine highly damaging mutations [Cysteine residue to Tyrosine in different positions(194, 282, 102, 190, 176, 259, 279, 180, 268)/ (rs 1800562)], the reports indicated that the mutations in 100% conserved region for all, the mutant residues were bigger than the wild-type residues and the wild-type residues were more hydrophobic than the mutant residues, the wild-type residues annotated in Uniprot to involve in a cysteine bridge, which is important for stability of the protein, the mutations causes’ loss of this interaction and have a severe effect on the 3D-structure of the protein and the variants annotated with severe disease (Figure 3), but C282Y mutation was not given report by project hope software and their protein 3D structure obtained from Raptor X server and treated by Chimera tool (Figure 3,4,5).

Table 1: Highly damaging nsSNPs results obtained by; PolyPhen-2, SIFT, I-Mutant and SNPs&GO servers.

Amino acid Change PolyPhen-2   SIFT   I MUTANT   PhD-SNP   SNPs&GO
Effect Score Prediction Index DDG RI Predation Predation probability RI Predation probability RI
C194Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.844 7
C282Y Probably damaging 0.999 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.845 7
C102Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.87 7
C190Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.87 7
C176Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.876 8
C259Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.845 7
C279Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.845 7
C180Y Probably damaging   1 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.843 7
C268Y Probably damaging 0.999 Deleterious   0 0.02 1 Increase Disease 0.977 10 Disease  0.425 2

Table 2: GeneMANIA results of genes co-expression and share domain with HFE gene.

Gene symbol Description Co-expression shared domain
ATF2  activating transcription factor 2 Yes No
TFRC transferrin receptor Yes No
B2M beta-2-microglobulin Yes Yes
TFR2 transferrin receptor 2 Yes No
MR1 major histocompatibility complex, class I-related Yes Yes
GALNS galactosamine (N-acetyl)-6-sulfatase Yes No
HLA-E major histocompatibility complex, class I, E Yes Yes
ID3 inhibitor of DNA binding 3, HLH protein Yes No
IGFBP4 insulin like growth factor binding protein 4 Yes No
TPP1 tripeptidyl peptidase Yes No
HLA-B major histocompatibility complex, class I, B Yes Yes
MICA MHC class I polypeptide-related sequence A Yes Yes
HLA-C major histocompatibility complex, class I, C Yes Yes
TPMT thiopurine S-methyltransferase Yes No
IL13RA1 interleukin 13 receptor subunit alpha 1 Yes No
DSE dermatan sulfate epimerase Yes No
CFI complement factor I Yes No
CD44 CD44 molecule (Indian blood group) Yes No
PRICKLE3 prickle planar cell polarity protein 3 Yes No
HLA-F major histocompatibility complex, class I, F Yes Yes

Table 3: GeneMANIA results of HFE gene functions and its appearance in network and genome.

Feature  FDR Genes in network Genes in genome
Antigen binding 3.44E-9     7 59
Phagocytic vesicle membrane 2.17E-7   5 22
Antigen processing and presentation 2.26E-7   8 216
Interferon-gamma-mediated signaling pathway 5.53E-7   3 76
ER to Golgi transport vesicle membrane 5.55E-7   5 31
ER to Golgi transport vesicle 7.55E-7   5 35
early Endosome membrane 7.55E-7   5 35

HFE gene SNPs analyzed by using translation bioinformatics prediction tools; for functional and structural analysis of mutations in nonsynonymous coding region and to analysis functions and interaction of HFE gene with functional similar genes. Nine SNPs on (rs 1800562) predicted as highly damaging, increase the protein stability, have a severe effect on the 3D-structure of the protein and disease associated.


The authors are acknowledgement; Dr. Hisham Noureldayem Altaib, Faculty of medical laboratories sciences, Sudan University of science and Technology for his guidance and support in this work.


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Bahereldeen AI, Alfadil RG, Ali HM, Nasser RM, Eisa NT, et al. (2020) In silico analysis of Single Nucleotide Polymorphisms (SNPs) in Human HFE Gene coding region. J Bioinform, Genomics, Proteomics 5(1): 1040

Received : 14 Oct 2019
Accepted : 23 Jan 2020
Published : 27 Jan 2020
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Launched : 2013
Journal of Immunology and Clinical Research
ISSN : 2333-6714
Launched : 2013
Annals of Forensic Research and Analysis
ISSN : 2378-9476
Launched : 2014
JSM Biochemistry and Molecular Biology
ISSN : 2333-7109
Launched : 2013
Annals of Breast Cancer Research
ISSN : 2641-7685
Launched : 2016
Annals of Gerontology and Geriatric Research
ISSN : 2378-9409
Launched : 2014
Journal of Sleep Medicine and Disorders
ISSN : 2379-0822
Launched : 2014
JSM Burns and Trauma
ISSN : 2475-9406
Launched : 2016
Chemical Engineering and Process Techniques
ISSN : 2333-6633
Launched : 2013
Annals of Clinical Cytology and Pathology
ISSN : 2475-9430
Launched : 2014
JSM Allergy and Asthma
ISSN : 2573-1254
Launched : 2016
Journal of Neurological Disorders and Stroke
ISSN : 2334-2307
Launched : 2013
Annals of Sports Medicine and Research
ISSN : 2379-0571
Launched : 2014
JSM Sexual Medicine
ISSN : 2578-3718
Launched : 2016
Annals of Vascular Medicine and Research
ISSN : 2378-9344
Launched : 2014
JSM Biotechnology and Biomedical Engineering
ISSN : 2333-7117
Launched : 2013
Journal of Hematology and Transfusion
ISSN : 2333-6684
Launched : 2013
JSM Environmental Science and Ecology
ISSN : 2333-7141
Launched : 2013
Journal of Cardiology and Clinical Research
ISSN : 2333-6676
Launched : 2013
JSM Nanotechnology and Nanomedicine
ISSN : 2334-1815
Launched : 2013
Journal of Ear, Nose and Throat Disorders
ISSN : 2475-9473
Launched : 2016
JSM Ophthalmology
ISSN : 2333-6447
Launched : 2013
Journal of Pharmacology and Clinical Toxicology
ISSN : 2333-7079
Launched : 2013
Annals of Psychiatry and Mental Health
ISSN : 2374-0124
Launched : 2013
Medical Journal of Obstetrics and Gynecology
ISSN : 2333-6439
Launched : 2013
Annals of Pediatrics and Child Health
ISSN : 2373-9312
Launched : 2013
JSM Clinical Pharmaceutics
ISSN : 2379-9498
Launched : 2014
JSM Foot and Ankle
ISSN : 2475-9112
Launched : 2016
JSM Alzheimer's Disease and Related Dementia
ISSN : 2378-9565
Launched : 2014
Journal of Addiction Medicine and Therapy
ISSN : 2333-665X
Launched : 2013
Journal of Veterinary Medicine and Research
ISSN : 2378-931X
Launched : 2013
Annals of Public Health and Research
ISSN : 2378-9328
Launched : 2014
Annals of Orthopedics and Rheumatology
ISSN : 2373-9290
Launched : 2013
Journal of Clinical Nephrology and Research
ISSN : 2379-0652
Launched : 2014
Annals of Community Medicine and Practice
ISSN : 2475-9465
Launched : 2014
Annals of Biometrics and Biostatistics
ISSN : 2374-0116
Launched : 2013
JSM Clinical Case Reports
ISSN : 2373-9819
Launched : 2013
Journal of Cancer Biology and Research
ISSN : 2373-9436
Launched : 2013
Journal of Surgery and Transplantation Science
ISSN : 2379-0911
Launched : 2013
Journal of Dermatology and Clinical Research
ISSN : 2373-9371
Launched : 2013
JSM Gastroenterology and Hepatology
ISSN : 2373-9487
Launched : 2013
TEST Journal of Dentistry
ISSN : 1234-5678
Launched : 2014
Annals of Nursing and Practice
ISSN : 2379-9501
Launched : 2014
JSM Dentistry
ISSN : 2333-7133
Launched : 2013
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