ABCA4 p.Gly1578Arg
| ClinVar: |
c.4732G>A
,
p.Gly1578Arg
?
, not provided
|
| Predicted by SNAP2: | A: D (59%), C: D (66%), D: D (63%), E: D (66%), F: D (80%), H: D (66%), I: D (80%), K: D (66%), L: D (80%), M: D (75%), N: N (57%), P: D (66%), Q: D (63%), R: N (53%), S: N (53%), T: N (53%), V: D (75%), W: D (91%), Y: D (80%), |
| Predicted by PROVEAN: | A: N, C: N, D: N, E: N, F: N, H: N, I: N, K: N, L: N, M: N, N: N, P: N, Q: N, R: N, S: N, T: N, V: N, W: N, Y: N, |
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[hide] Genotype-phenotype analysis of ABCR variants in ma... Invest Ophthalmol Vis Sci. 2002 Feb;43(2):466-73. Bernstein PS, Leppert M, Singh N, Dean M, Lewis RA, Lupski JR, Allikmets R, Seddon JM
Genotype-phenotype analysis of ABCR variants in macular degeneration probands and siblings.
Invest Ophthalmol Vis Sci. 2002 Feb;43(2):466-73., [PMID:11818392]
Abstract [show]
PURPOSE: Single-copy variants of the autosomal recessive Stargardt disease (STGD1) gene ABCR (ABCA4) have been shown to confer enhanced susceptibility to age-related macular degeneration (AMD). To investigate the role of ABCR alleles in AMD further, genotype-phenotype analysis was performed on siblings of patients with AMD who had known ABCR variants. This genetically related population provides a cohort of subjects with similar age and ethnic background for genotype-phenotype comparison to the original probands. METHODS: All available siblings of 26 probands carrying probable disease-associated ABCR variants were examined clinically. Blood samples were collected from these siblings for genotype analysis to search for the ABCR variant alleles corresponding to the isofamilial proband. RESULTS: Nineteen of 33 siblings from 15 families carried the respective proband's variant ABCR allele. Some families exhibited concordance of ABCR alleles with macular degeneration phenotype, but others did not. Exudative AMD was uncommon among both probands and siblings. CONCLUSIONS: Although population studies have indicated that some ABCR variant alleles may enhance susceptibility to AMD, investigation of the extent of ABCR involvement by kindred analysis is complicated by a plethora of environmental and other hereditary factors not investigated in the current study that may also play important roles.
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No. Sentence Comment
52 AMD Grade of Probands Carrying Heterozygous ABCR Variants ABCR Variant Grade 1 Grade 2 Grade 3 Grade 4 Grade 5 E471K 0 0 1 1 0 P940R* 0 0 0 1 0 T1428M 0 0 1 0 0 R1517S 0 0 0 1 0 I1562T 0 0 1 1 0 G1578R 0 0 1 0 0 5196ϩ1G3A 0 0 1 0 0 R1898H 0 0 0 1 0 G1961E 0 0 2 4 0 L1970F 0 0 1 0 0 6519⌬11bp 0 0 0 1 0 D2177N 0 1 3 3 0 6568⌬C 0 0 0 0 1 Data are number of probands at each grade.
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ABCA4 p.Gly1578Arg 11818392:52:195
status: NEW[hide] Cosegregation and functional analysis of mutant AB... Hum Mol Genet. 2001 Nov 1;10(23):2671-8. Shroyer NF, Lewis RA, Yatsenko AN, Wensel TG, Lupski JR
Cosegregation and functional analysis of mutant ABCR (ABCA4) alleles in families that manifest both Stargardt disease and age-related macular degeneration.
Hum Mol Genet. 2001 Nov 1;10(23):2671-8., [PMID:11726554]
Abstract [show]
Mutations in ABCR (ABCA4) have been reported to cause a spectrum of autosomal recessively inherited retinopathies, including Stargardt disease (STGD), cone-rod dystrophy and retinitis pigmentosa. Individuals heterozygous for ABCR mutations may be predisposed to develop the multifactorial disorder age-related macular degeneration (AMD). We hypothesized that some carriers of STGD alleles have an increased risk to develop AMD. We tested this hypothesis in a cohort of families that manifest both STGD and AMD. With a direct-sequencing mutation detection strategy, we found that AMD-affected relatives of STGD patients are more likely to be carriers of pathogenic STGD alleles than predicted based on chance alone. We further investigated the role of AMD-associated ABCR mutations by testing for expression and ATP-binding defects in an in vitro biochemical assay. We found that mutations associated with AMD have a range of assayable defects ranging from no detectable defect to apparent null alleles. Of the 21 missense ABCR mutations reported in patients with AMD, 16 (76%) show abnormalities in protein expression, ATP-binding or ATPase activity. We infer that carrier relatives of STGD patients are predisposed to develop AMD.
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116 To analyze the function of AMD-associated ABCR mutations, we characterized the effects of seven different missense mutations (D645N, T901A, T1428M, R1517S, I1562T, G1578R and L1970F) on protein expression and ATP binding.
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ABCA4 p.Gly1578Arg 11726554:116:164
status: NEW[hide] Molecular genetic analysis of ABCR gene in Japanes... Jpn J Ophthalmol. 2000 May-Jun;44(3):245-9. Fuse N, Suzuki T, Wada Y, Yoshida M, Shimura M, Abe T, Nakazawa M, Tamai M
Molecular genetic analysis of ABCR gene in Japanese dry form age-related macular degeneration.
Jpn J Ophthalmol. 2000 May-Jun;44(3):245-9., [PMID:10913642]
Abstract [show]
PURPOSE: To explore whether the mutation in the retina-specific ATP-binding cassette transporter (ABCR) gene, the Stargardt's disease gene, contributes to the prevalence of the dry form of age-related macular degeneration (dry AMD) in Japanese unrelated patients. METHODS: Twenty-five Japanese unrelated patients with dry AMD who were diagnosed by fluorescein angiography and indocyanine green angiography were chosen as the dry AMD group. None of these cases had apparent choroidal neovascularization. To detect the mutations in the ABCR gene, genomic DNA was extracted from leukocytes of peripheral blood, and 26 exons of the ABCR gene were amplified by polymerase chain reaction (PCR). All the PCR products were then directly sequenced. When a mutation was detected, the occurrence of a mutation was compared between these AMD patients and the control group. RESULTS: After direct sequencing, a point mutation in exon 29 was found in one of the 25 dry AMD patients. In addition, a polymorphism in exon 45 was found in two other patients, and three sequence variations in exon 23 were detected in all patients. The incidence in AMD patients in whom a mutation in exon 29 (4%) was detected was less than that in controls (5%). Screening of the intron-exon boundaries also led to the identification of intronic mutation in intron 33. CONCLUSION: In this study we found no relationship between allelic variation in the ABCR gene and the prevalence of dry AMD in Japanese unrelated patients.
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No. Sentence Comment
31 Mutations Found in ABCR* Gene in 26 Exons Examined in This Study Exon AMD† Stargardt`s Disease Exon AMD Stargardt`s Disease 11 E471K 29 T1428M 15 31 R1517S 16 G818E, G863A (D847H) 33 I1562T G1578R 17 34 N1614FS 18 35 19 V931M, 2884delC N965M, (R943Q) 36 5196ϩ1G→A 5041deL15 5196ϩ2T→C 20 40 R1898H R1898H 21 A1028V 42 G1961E G1961E 22 3211insGT, V1072A E1087K 43 L1970F 6006ϩ1G→T 23 R1129L 44 L2027F, R2038W (I2023I) 24 45 V2050L, R2077W (I2083I) 25 46 R2106C (V2094V) 27 48 6519⌬11bp D2177N 6568⌬C 6519⌬11bp 6709insG *ABCR: ATP-binding cassette transporter.
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ABCA4 p.Gly1578Arg 10913642:31:197
status: NEW[hide] Analysis of the Stargardt disease gene (ABCR) in a... Ophthalmology. 1999 Aug;106(8):1531-6. De La Paz MA, Guy VK, Abou-Donia S, Heinis R, Bracken B, Vance JM, Gilbert JR, Gass JD, Haines JL, Pericak-Vance MA
Analysis of the Stargardt disease gene (ABCR) in age-related macular degeneration.
Ophthalmology. 1999 Aug;106(8):1531-6., [PMID:10442900]
Abstract [show]
PURPOSE: Age-related macular degeneration (AMD) is a complex genetic disorder and the leading cause of severe vision loss in the elderly. The Stargardt disease gene (ABCR) has been proposed as a major genetic risk factor in AMD. The purpose of this study was to evaluate the authors' AMD population for the specific ABCR variants proposed previously as genetic risk factors for AMD. METHODS: The authors screened their AMD population (159 familial cases from 112 multiplex families and 53 sporadic cases) and 56 racially matched individuals with no known history of AMD from the same clinic population for evidence of the ABCR variants. Grading of disease severity was performed according to a standard protocol. Patients with extensive intermediate drusen or large soft drusen, drusenoid retinal pigment epithelial (RPE) detachments, geographic atrophy of the RPE, or evidence of exudative maculopathy were considered affected. Analysis for variants was performed by polymerase chain reaction amplification of individual exons of the ABCR gene with flanking primers and a combination of single-strand conformation polymorphism, heteroduplex analysis, and high-performance liquid chromatography. All abnormal conformers detected using these techniques were characterized by direct sequencing. RESULTS: The authors identified only two of the previously reported variants in their study population. Both variants occurred in sporadic cases, and none was found in familial cases or the randomly selected population. In addition, the authors identified several newly described polymorphisms and variants in both the AMD and control populations. CONCLUSIONS: Based on these initial findings, the authors suggest that ABCR is not a major genetic risk factor for AMD in their study population. Additional genetic studies are needed to more fully evaluate the role of ABCR in AMD.
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107 Number of Age-related Macular Degeneration (AMD) Cases with Variants* Mutation Duke (n ؍ 169)† D2177N 2 (1.2%) E471K 0 R1129L 0 T1428M 0 R1517S 0 I1562T 0 G1578R 0 5169 ϩ 1G 3 A 0 R1898H 0 G1961E 0 L1970F 0 6519⌬11bp 0 6568⌬C 0 Total 2 (1.2%) * Variants considered to be associated with the genetic etiology of AMD by Allikmets et al.31 † Independent cases are determined by counting 1 familial AMD case from each of the 112 families and adding the 57 sporadic AMD cases, for a total of 169 cases.
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ABCA4 p.Gly1578Arg 10442900:107:184
status: NEW[hide] Mutation of the Stargardt disease gene (ABCR) in a... Science. 1997 Sep 19;277(5333):1805-7. Allikmets R, Shroyer NF, Singh N, Seddon JM, Lewis RA, Bernstein PS, Peiffer A, Zabriskie NA, Li Y, Hutchinson A, Dean M, Lupski JR, Leppert M
Mutation of the Stargardt disease gene (ABCR) in age-related macular degeneration.
Science. 1997 Sep 19;277(5333):1805-7., [PMID:9295268]
Abstract [show]
Age-related macular degeneration (AMD) is the leading cause of severe central visual impairment among the elderly and is associated both with environmental factors such as smoking and with genetic factors. Here, 167 unrelated AMD patients were screened for alterations in ABCR, a gene that encodes a retinal rod photoreceptor protein and is defective in Stargardt disease, a common hereditary form of macular dystrophy. Thirteen different AMD-associated alterations, both deletions and amino acid substitutions, were found in one allele of ABCR in 26 patients (16%). Identification of ABCR alterations will permit presymptomatic testing of high-risk individuals and may lead to earlier diagnosis of AMD and to new strategies for prevention and therapy.
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99 Mutation AMD (n ϭ167) STGD (n ϭ 98) General population (n ϭ 220) E471K 2 (1.2%) NA 0 (0%) R1129L 1 (0.6%) 0 (0%)* 0 (0%) T1428M 1 (0.6%) 0 (0%) 0 (0%) R1517S 1 (0.6%) 0 (0%) 0 (0%) I1562T 2 (1.2%) 0 (0%) 0 (0%) G1578R 1 (0.6%) 0 (0%) 0 (0%) 5196ϩ1G 3 A 1 (0.6%) 0 (0%) 0 (0%) R1898H 1 (0.6%) 4 (4%) 0 (0%) G1961E 6 (3.6%) 8 (8%) 0 (0%) L1970F 1 (0.6%) 0 (0%) 0 (0%) 6519⌬11bp 1 (0.6%)† 1 (1%)† 0 (0%) D2177N 7 (4.2%) 0 (0%) 1 (0.45%) 6568⌬C 1 (0.6%) 0 (0%) 0 (0%) Totals 26 (16%) 13 (13%) 1 (0.45%) *A substitution to a different amino acid (R1129C) was detected in one STGD1 patient.
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ABCA4 p.Gly1578Arg 9295268:99:229
status: NEW96 Mutation AMD (n 5167) STGD (n 5 98) General population (n 5 220) E471K 2 (1.2%) NA 0 (0%) R1129L 1 (0.6%) 0 (0%)* 0 (0%) T1428M 1 (0.6%) 0 (0%) 0 (0%) R1517S 1 (0.6%) 0 (0%) 0 (0%) I1562T 2 (1.2%) 0 (0%) 0 (0%) G1578R 1 (0.6%) 0 (0%) 0 (0%) 519611G 3 A 1 (0.6%) 0 (0%) 0 (0%) R1898H 1 (0.6%) 4 (4%) 0 (0%) G1961E 6 (3.6%) 8 (8%) 0 (0%) L1970F 1 (0.6%) 0 (0%) 0 (0%) 6519D11bp 1 (0.6%)ߤ 1 (1%)ߤ 0 (0%) D2177N 7 (4.2%) 0 (0%) 1 (0.45%) 6568DC 1 (0.6%) 0 (0%) 0 (0%) Totals 26 (16%) 13 (13%) 1 (0.45%) *A substitution to a different amino acid (R1129C) was detected in one STGD1 patient.
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ABCA4 p.Gly1578Arg 9295268:96:211
status: NEW