1
|
Jin KW, Joo K, Woo SJ. Clinical Characterization of Korean Patients with Pseudoxanthoma Elasticum and Angioid Streaks. Genes (Basel) 2021; 12:genes12081207. [PMID: 34440381 PMCID: PMC8391950 DOI: 10.3390/genes12081207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 07/31/2021] [Accepted: 08/01/2021] [Indexed: 12/04/2022] Open
Abstract
This study aimed to characterize Korean patients with pseudoxanthoma elasticum (PXE) presenting with angioid streaks. Retinal phenotypes were longitudinally evaluated by multimodal ophthalmic imaging, and targeted gene panel sequencing for inherited retinal diseases was conducted. Seven subjects from unrelated families (median age, 51.2 years) were enrolled and followed for a median of 3.2 years. Four asymptomatic patients were significantly younger than three symptomatic patients with decreased visual acuity at presentation (mean age; 38.1 vs. 61.5 years, p = 0.020). The asymptomatic patients maintained good vision (20/32 or better) and had no choroidal neovascularization (CNV) over the observation period. The symptomatic patients showed additional reduction in visual acuity and bilateral CNV occurrence during the longitudinal follow-up. Pathogenic ABCC6 variants were identified in all patients, leading to a diagnosis of PXE. Heterozygous monoallelic variants were identified in four patients and compound heterozygous variants were detected in three patients. Nine ABCC6 variants were identified, including one novel variant, c.2035G>T [p.Glu679Ter]. This is the first genetic study of Korean patients with PXE.
Collapse
|
2
|
Mandura RA, Radi RE. Angioid Streaks in Pseudoxanthoma Elasticum. Cureus 2021; 13:e15720. [PMID: 34277296 PMCID: PMC8286068 DOI: 10.7759/cureus.15720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2021] [Indexed: 11/05/2022] Open
Abstract
Pseudoxanthoma elasticum, or Gronblad-Strandberg syndrome, is an inherited disorder that involves multiple organ systems. The characteristic degeneration and calcification of the elastic fibers caused by this disease were first observed by Ferdinand Jean Darrier in 1896. We report a case of a 27-year-old female who was diagnosed with pseudoxanthoma elasticum based on a skin biopsy prior to her presentation to our ophthalmology outpatient clinic. The past ocular history of the patient was unremarkable for any previous eye complaint or surgery. Her ocular and fundus examination showed pigmented grayish irregular post choroidal crack-like linear dehiscence, forming a network-like pattern, originating at the optic disc and extending radially involving the macular area and the posterior pole in both eyes, representing bilateral angioid streaks. There were no clinical or optical coherent tomographic signs of choroidal neovascularization. Periodic follow up for patients with pseudoxanthoma elasticum is recommended to detect choroidal neovascularization which is a sight-threatening complication. Ophthalmologists should be aware of this association as early recognition and treatment are vital to prevent irreversible visual loss.
Collapse
Affiliation(s)
- Rahaf A Mandura
- Department of Ophthalmology, King Abdul-Aziz University, Jeddah, SAU
| | - Rwan E Radi
- College of Medicine, Umm Al-Qura University, Mecca, SAU
| |
Collapse
|
3
|
Yamazaki Y, Iwanaga A, Koike Y, Sato T, Murota H, Takeuchi M, Satoh T. A possible case of pseudoxanthoma elasticum (PXE) with histopathological features of PXE-like papillary dermal elastolysis. J Dermatol 2021; 48:e265-e266. [PMID: 33759225 DOI: 10.1111/1346-8138.15859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 03/04/2021] [Accepted: 03/04/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Yuki Yamazaki
- Department of Dermatology, National Defense Medical College, Tokorozawa, Japan
| | - Akira Iwanaga
- Department of Dermatology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yuta Koike
- Department of Dermatology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Tomohito Sato
- Department of Ophthalmology, National Defense Medical College, Tokorozawa, Japan
| | - Hiroyuki Murota
- Department of Dermatology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Masaru Takeuchi
- Department of Ophthalmology, National Defense Medical College, Tokorozawa, Japan
| | - Takahiro Satoh
- Department of Dermatology, National Defense Medical College, Tokorozawa, Japan
| |
Collapse
|
4
|
|
5
|
Frasca M. Gene2DisCo: Gene to disease using disease commonalities. Artif Intell Med 2017; 82:34-46. [DOI: 10.1016/j.artmed.2017.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Revised: 07/24/2017] [Accepted: 08/13/2017] [Indexed: 01/10/2023]
|
6
|
ABCC6 Gene Analysis in 20 Japanese Patients with Angioid Streaks Revealing Four Frequent and Two Novel Variants and Pseudodominant Inheritance. J Ophthalmol 2017; 2017:1079687. [PMID: 28912966 PMCID: PMC5585540 DOI: 10.1155/2017/1079687] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/06/2017] [Indexed: 11/18/2022] Open
Abstract
Purpose To report the spectrum of ABCC6 variants in Japanese patients with angioid streaks (AS). Patients and Methods This was a single-center cohort study. The medical records of 20 patients with AS from 18 unrelated Japanese families were retrospectively reviewed. Screening of the ABCC6 gene (exons 1 to 31) was performed using PCR-based Sanger sequencing. Results Eight ABCC6 variants were identified as candidate disease-causing variants. These eight variants included five known variants (p.Q378X, p.R419Q, p.V848CfsX83, p.R1114C, and p.R1357W), one previously reported variant (p.N428S) of unknown significance, and two novel variants (c.1939C>T [p.H647Y] and c.3374C>T [p.S1125F]); the three latter variants were determined to be variants of significance. The following four variants were frequently identified: p.V848CfsX83 (14/40 alleles, 35.0%), p.Q378X (7/40 alleles, 17.5%), p.R1357W (6/40 alleles, 15.0%), and p.R419Q (4/40 alleles, 10.0%). The ABCC6 variants were identified in compound heterozygous or homozygous states in 13 of 18 probands. Two families showed a pseudodominant inheritance pattern. Pseudoxanthoma elasticum was seen in 15 of 17 patients (88.2%) who underwent dermatological examination. Conclusions We identified disease-causing ABCC6 variants that were in homozygous or compound heterozygous states in 13 of 18 families (72.2%). Our results indicated that ABCC6 variants play a significant role in patients with AS in the Japanese population.
Collapse
|
7
|
Abstract
Pseudoxanthoma elasticum (PXE) is a genetic metabolic disease with autosomal recessive inheritance caused by mutations in the ABCC6 gene. The lack of functional ABCC6 protein leads to ectopic mineralization that is most apparent in the elastic tissues of the skin, eyes and blood vessels. The clinical prevalence of PXE has been estimated at between 1 per 100,000 and 1 per 25,000, with slight female predominance. The first clinical sign of PXE is almost always small yellow papules on the nape and sides of the neck and in flexural areas. The papules coalesce, and the skin becomes loose and wrinkled. The mid-dermal elastic fibers are short, fragmented, clumped and calcified. Dystrophic calcification of Bruch's membrane, revealed by angioid streaks, may trigger choroidal neovascularization and, ultimately, loss of central vision and blindness in late-stage disease. Lesions in small and medium-sized artery walls may result in intermittent claudication and peripheral artery disease. Cardiac complications (myocardial infarction, angina pectoris) are thought to be relatively rare but merit thorough investigation. Ischemic strokes have been reported. PXE is a metabolic disease in which circulating levels of an anti-mineralization factor are low. There is good evidence to suggest that the factor is inorganic pyrophosphate (PPi), and that the circulating low levels of PPi and decreased PPi/Pi ratio result from the lack of ATP release by hepatocytes harboring the mutant ABCC6 protein. However, the substrate(s) bound, transported or modulated by the ABCC6 protein remain unknown. More than 300 sequence variants of the ABCC6 gene have been identified. There is no cure for PXE; the main symptomatic treatments are vascular endothelial growth factor inhibitor therapy (for ophthalmic manifestations), lifestyle, lipid-lowering and dietary measures (for reducing vascular risk factors), and vascular surgery (for severe cardiovascular manifestations). Future treatment options may include gene therapy/editing and pharmacologic chaperone therapy.
Collapse
Affiliation(s)
- Dominique P Germain
- Division of Medical Genetics, University of Versailles - Saint Quentin en Yvelines, Paris-Saclay University, 2 avenue de la source de la Bièvre, F-78180, Montigny, France.
| |
Collapse
|
8
|
Iwanaga A, Okubo Y, Yozaki M, Koike Y, Kuwatsuka Y, Tomimura S, Yamamoto Y, Tamura H, Ikeda S, Maemura K, Tsuiki E, Kitaoka T, Endo Y, Mishima H, Yoshiura KI, Ogi T, Tanizaki H, Wataya-Kaneda M, Hattori T, Utani A. Analysis of clinical symptoms andABCC6mutations in 76 Japanese patients with pseudoxanthoma elasticum. J Dermatol 2017; 44:644-650. [DOI: 10.1111/1346-8138.13727] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 11/10/2016] [Indexed: 10/20/2022]
Affiliation(s)
- Akira Iwanaga
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| | - Yumi Okubo
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| | - Mariko Yozaki
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| | - Yuta Koike
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| | - Yutaka Kuwatsuka
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| | - Saori Tomimura
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| | - Yosuke Yamamoto
- Department of Healthcare Epidemiology Research; Graduate School of Medicine; Kyoto University; Kyoto Japan
- Department of Dermatology; Graduate School of Biomedical Sciences; Kyoto University; Kyoto Japan
| | - Hiroshi Tamura
- Department of Ophthalmology and Visual Sciences; Graduate School of Medicine; Kyoto University; Kyoto Japan
- Division of Medical Information Technology and Administration Planning; Kyoto University Hospital; Kyoto Japan
| | - Satoshi Ikeda
- Department of Cardiovascular Medicine; Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki Japan
| | - Koji Maemura
- Department of Cardiovascular Medicine; Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki Japan
| | - Eiko Tsuiki
- Department of Ophthalmology; Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki Japan
| | - Takashi Kitaoka
- Department of Ophthalmology; Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki Japan
| | - Yuichiro Endo
- Department of Dermatology; Graduate School of Biomedical Sciences; Kyoto University; Kyoto Japan
| | - Hiroyuki Mishima
- Department of Human Genetics; Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki Japan
| | - Koh-Ichiro Yoshiura
- Department of Human Genetics; Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki Japan
| | - Tomoo Ogi
- Department of Genetics; Research Institute of Environmental Medicine; Nagoya University; Aichi Japan
| | | | - Mari Wataya-Kaneda
- Department of Dermatology; Graduate School of Medicine; Osaka University; Osaka Japan
| | - Tomoyasu Hattori
- Department of Dermatology; Graduate School of Medicine; Gunma University; Gunma Japan
| | - Atsushi Utani
- Department of Dermatology; Graduate School of Biomedical Sciences; Nagasaki University Nagasaki Japan
| |
Collapse
|
9
|
Haplotype-based, case–control study of the receptor (calcitonin) activity-modifying protein (RAMP) 1 gene in essential hypertension. J Hum Hypertens 2017; 31:361-365. [DOI: 10.1038/jhh.2016.96] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 08/13/2016] [Accepted: 09/19/2016] [Indexed: 12/16/2022]
|
10
|
Jin L, Jiang Q, Wu Z, Shao C, Zhou Y, Yang L, Uitto J, Wang G. Genetic heterogeneity of pseudoxanthoma elasticum: the Chinese signature profile of ABCC6 and ENPP1 mutations. J Invest Dermatol 2015; 135:1294-1302. [PMID: 25615550 PMCID: PMC4402129 DOI: 10.1038/jid.2015.10] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 12/09/2014] [Accepted: 12/16/2014] [Indexed: 12/28/2022]
Abstract
Pseudoxanthoma elasticum (PXE), an autosomal recessive disorder characterized by ectopic mineralization, is caused by mutations in the ABCC6 gene. We examined clinically 29 Chinese PXE patients from unrelated families, so far the largest cohort of Asian PXE patients. In a subset of 22 patients, we sequenced ABCC6 and another candidate gene, ENPP1, and conducted pathogenicity analyses for each variant. We identified a total of 17 distinct mutations in ABCC6, 15 of them being, to our knowledge, previously unreported, including 5 frameshift and 10 missense variants. In addition, a missense mutation in combination with a recurrent nonsense mutation in ENPP1 was discovered in a pediatric PXE case. No cases with p.R1141X or del23-29 mutations, common in Caucasian patient populations, were identified. The 10 missense mutations in ABCC6 were expressed in the mouse liver via hydrodynamic tail-vein injections. One mutant protein showed cytoplasmic accumulation indicating abnormal subcellular trafficking, while the other nine mutants showed correct plasma membrane location. These nine mutations were further investigated for their pathogenicity using a recently developed zebrafish mRNA rescue assay. Minimal rescue of the morpholino-induced phenotype was achieved with eight of the nine mutant human ABCC6 mRNAs tested, implying pathogenicity. This study demonstrates that the Chinese PXE population harbors unique ABCC6 mutations. These genetic data have implications for allele-specific therapy currently being developed for PXE.
Collapse
Affiliation(s)
- Liang Jin
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Qiujie Jiang
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Zhengsheng Wu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Changxia Shao
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Yong Zhou
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA; Department of Dermatology, PLA General Hospital, Beijing, China
| | - Luting Yang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Jouni Uitto
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA.
| | - Gang Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
| |
Collapse
|
11
|
Fuwa K, Hosono S, Nagano N, Munakata S, Fukamachi R, Okada T, Takahashi S, Takahashi S, Sato N, Nakayama T. Japanese neonate with congenital chloride diarrhea caused by SLC26A3 mutation. Pediatr Int 2015; 57:e11-3. [PMID: 25711268 DOI: 10.1111/ped.12501] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 07/13/2014] [Accepted: 08/07/2014] [Indexed: 01/26/2023]
Abstract
Congenital chloride diarrhea (CCD) beginning in utero is a rare autosomal recessive inherited disorder characterized by impairment of Cl(-) /HCO3 (-) exchange in an otherwise normal distal ileum and colon. Life-long secretory diarrhea is caused by mutations in solute carrier family 26, member 3, (SLC26A3), which disrupt epithelial Cl(-) /HCO3 (-) transport in the ileum and colon. Although 55 mutations in SLC26A3 have been identified throughout the world, few Japanese cases have been confirmed on genetic analysis. We report the successful treatment of a Japanese neonate with CCD caused by SLC26A3 mutation.
Collapse
Affiliation(s)
- Kazumasa Fuwa
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Tanaka K, Nakayama T, Mori R, Sato N, Kawamura A, Yuzawa M. Associations of complement factor B and complement component 2 genotypes with subtypes of polypoidal choroidal vasculopathy. BMC Ophthalmol 2014; 14:83. [PMID: 24965207 PMCID: PMC4076251 DOI: 10.1186/1471-2415-14-83] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 06/09/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND We previously reported on subtypes of polypoidal choroidal vasculopathy (PCV), and categorized PCV as polypoidal choroidal neovascularization (CNV) and typical PCV. The aim of this study was to clarify whether complement component 2 (C2) and complement factor B (CFB) genotypes are associated with subtypes of polypoidal choroidal vasculopathy, such as polypoidal CNV and typical PCV. METHODS First, we categorized 677 patients into typical age-related macular degeneration (tAMD; 250 patients), PCV (376) and retinal angiomatous proliferation (RAP; 51). Second, we categorized 282 patients with PCV as having polypoidal CNV (84 patients) or typical PCV (198) based on indocyanine green angiographic findings. In total, 274 subjects without AMD, such as PCV and CNV, served as controls. A SNP (rs547154) in the C2 gene and three SNPs (rs541862, rs2072633, rs4151667) in the CFB gene were genotyped, and case-control studies were performed in subjects with these PCV subtypes. RESULTS In tAMD, no SNPs were associated with allele distributions. In PCV, rs547154 and rs2072633 were associated with allele distributions. RAP was only associated with rs2072633. After logistic regression analysis with adjustment for confounding factors, tAMD, PCV and RAP were found to be associated with rs2072633.As to PCV subtypes, there were significant differences in the distributions of rs547154, rs541862 and rs2072633 in the case-control studies for polypoidal CNV, but not between the typical PCV and control groups. Logistic regression analysis with adjustment for confounding factors showed the distributions of rs547154, rs541862 and rs2072633 to differ significantly between the controls and polypoidal CNV cases and that these SNPs were protective. The A/A genotype of rs2072633 was significantly more common in the polypoidal CNV than in the typical PCV group (p = 0.03), even with adjustment for polyp number and greatest linear dimension. CONCLUSIONS PCV might be genetically divisible into polypoidal CNV and typical PCV. The C2 and CFB gene variants were shown to be associated with polypoidal CNV. Typical PCV was not associated with variants in these genes.
Collapse
Affiliation(s)
- Koji Tanaka
- Department of Ophthalmology, Nihon University School of Medicine, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8309, Japan
| | - Tomohiro Nakayama
- Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan
| | - Ryusaburo Mori
- Department of Ophthalmology, Nihon University School of Medicine, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8309, Japan
| | - Naoyuki Sato
- Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan
| | - Akiyuki Kawamura
- Department of Ophthalmology, Nihon University School of Medicine, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8309, Japan
| | - Mitsuko Yuzawa
- Department of Ophthalmology, Nihon University School of Medicine, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8309, Japan
| |
Collapse
|
13
|
Uitto J, Bercovitch L, Terry SF, Terry PF. Pseudoxanthoma elasticum: progress in diagnostics and research towards treatment : Summary of the 2010 PXE International Research Meeting. Am J Med Genet A 2011; 155A:1517-26. [PMID: 21671388 PMCID: PMC3121926 DOI: 10.1002/ajmg.a.34067] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Accepted: 03/25/2011] [Indexed: 11/07/2022]
Abstract
Pseudoxanthoma elasticum (PXE), a prototypic heritable disorder with ectopic mineralization, manifests with characteristic skin findings, ocular involvement, and cardiovascular problems. The classic forms of PXE are due to loss-of-function mutations in the ABCC6 gene, which encodes ABCC6, a putative transmembrane efflux transporter expressed primarily in the liver. While considerable progress has recently been made in understanding the molecular genetics and pathomechanisms of PXE, no effective or specific treatment is currently available for this disorder. PXE International, the premiere patient advocacy organization, organized a workshop in November 2010 to assess the current state of diagnostics and research to develop an agenda towards treatment of PXE. This overview summarizes the progress in PXE research, with emphasis on molecular therapies for this, currently intractable, disorder.
Collapse
Affiliation(s)
- Jouni Uitto
- Department of Dermatology and Cutaneous Biology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.
| | | | | | | |
Collapse
|
14
|
Li Q, Sadowski S, Uitto J. Angioid streaks in Pseudoxanthoma Elasticum: role of the p.R1268Q mutation in the ABCC6 gene. J Invest Dermatol 2010; 131:782-5. [PMID: 21179111 DOI: 10.1038/jid.2010.384] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
15
|
Wang LL, Liu YH, Meng LL, Li CG, Zhou SF. Phenotype prediction of non-synonymous single-nucleotide polymorphisms in human ATP-binding cassette transporter genes. Basic Clin Pharmacol Toxicol 2010; 108:94-114. [PMID: 20849526 DOI: 10.1111/j.1742-7843.2010.00627.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A large number of non-synonymous single-nucleotide polymorphisms (nsSNPs) have been found in human genome, but there is poor knowledge on the relationship between the genotype and phenotype of these nsSNPs. Human ATP-binding cassette (ABC) transporters are able to transport a number of important substrates including endogenous and exogenous compounds. This study aimed to predict the phenotypical impact of nsSNPs of human ABC transporter genes, and the predicted results were further validated by reported phenotypical data from site-directed mutagenesis and clinical genetic studies. One thousand and six hundred thirty-two nsSNPs were found from 49 human ABC transporter genes. Using the PolyPhen and SIFT algorithms, 41.8-53.6% of nsSNPs in ABC transporter genes were predicted to have an impact on protein function. The prediction accuracy was up to 63-85% when compared with known phenotypical data from in vivo and in vitro studies. There was a significant concordance between the prediction results using SIFT and PolyPhen. Of nsSNPs predicted as deleterious, the prediction scores by SIFT and PolyPhen were significantly related to the number of nsSNPs with known phenotypes confirmed by experimental and human studies. The amino acid substitution variants are supposed to be the pathogenetic basis of increased susceptibility to certain diseases with Mendelian or complex inheritance, altered drug resistance and altered drug clearance and response. Predicting the phenotypic consequence of nsSNPs using computational algorithms may provide a better understanding of genetic differences in susceptibility to diseases and drug response. The prediction of nsSNPs in human ABC transporter genes would be useful hints for further genotype-phenotype studies.
Collapse
Affiliation(s)
- Lin-Lin Wang
- Institute of Reproductive and Child Health, Peking University, Beijing, China
| | | | | | | | | |
Collapse
|