ABCMdb

ABCA4 p.Arg24Cys

ClinVar:	c.71G>A , p.Arg24His ? , not provided c.70C>T , p.Arg24Cys ? , not provided
Predicted by SNAP2:	A: D (71%), C: D (91%), D: D (71%), E: D (71%), F: D (75%), G: D (71%), H: D (85%), I: D (71%), K: D (91%), L: D (71%), M: D (71%), N: N (53%), P: D (71%), Q: D (59%), S: D (53%), T: N (53%), V: D (71%), W: D (85%), Y: D (71%),
Predicted by PROVEAN:	A: D, C: D, D: D, E: N, F: D, G: D, H: D, I: D, K: N, L: D, M: D, N: D, P: D, Q: N, S: D, T: D, V: D, W: D, Y: D,

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Publications
[hide] Microarray-based mutation analysis of the ABCA4 (A... Eur J Hum Genet. 2004 Dec;12(12):1024-32. Klevering BJ, Yzer S, Rohrschneider K, Zonneveld M, Allikmets R, van den Born LI, Maugeri A, Hoyng CB, Cremers FP
Microarray-based mutation analysis of the ABCA4 (ABCR) gene in autosomal recessive cone-rod dystrophy and retinitis pigmentosa.
Eur J Hum Genet. 2004 Dec;12(12):1024-32., [PMID:15494742]

Abstract [show]
Mutations in the ABCA4 gene have been associated with autosomal recessive Stargardt disease (STGD1), cone-rod dystrophy (CRD), and retinitis pigmentosa (RP). We employed a recently developed genotyping microarray, the ABCR400-chip, to search for known ABCA4 mutations in patients with isolated or autosomal recessive CRD (54 cases) or RP (90 cases). We performed detailed ophthalmologic examinations and identified at least one ABCA4 mutation in 18 patients (33%) with CRD and in five patients (5.6%) with RP. Single-strand conformation polymorphism (SSCP) analysis and subsequent DNA sequencing revealed four novel missense mutations (R24C, E161K, P597S, G618E) and a novel 1-bp deletion (5888delG). Ophthalmoscopic abnormalities in CRD patients ranged from minor granular pigmentary changes in the posterior pole to widespread atrophy. In 12 patients with recordable electroretinogram (ERG) tracings, a cone-rod pattern was detected. Three patients demonstrated progression from a retinal dystrophy resembling STGD1 to a more widespread degeneration, and were subsequently diagnosed as CRD. In addition to a variable degree of atrophy, all RP patients displayed ophthalmologic characteristics of classic RP. When detectable, ERG recordings in these patients demonstrated rod-cone patterns of photoreceptor degeneration. In conclusion, in this study, we show that the ABCA4 mutation chip is an efficient first screening tool for arCRD.

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No. Sentence Comment
3 Single-strand conformation polymorphism (SSCP) analysis and subsequent DNA sequencing revealed four novel missense mutations (R24C, E161K, P597S, G618E) and a novel 1-bp deletion (5888delG). Login to comment
43 The presence of R24C (70C4T) was analyzed using HinfI restriction fragment analysis of PCR-amplified exon 2. Login to comment
55 Likewise, the 2588C and 2828A variants are presumed to be located in the same allele since the 2588C allele in previous studies was always found together with 2828A (see Discussion).33,49 Next, we employed SSCP analysis and DNA sequencing in patients with one ABCA4 mutation and identified five novel ABCA4 mutations that were not present on the microarray, that is, R24C, E161K, P597S, G618E, and 5888delG. Login to comment
60 15429 Isolated 52C4T R18W 70C4T R24C ? Login to comment
143 Given this clinical presentation and the fact that homozygous null mutations were not found Table 5 Functional assessment of missense (A) and splice site (B) mutations (A) Missense mutation Nature of amino-acid change Effect on ABCR functionRef R18W Nonconservative Unknown R24C Nonconservative Unknown; adjacent to first transmembrane domain G65E Nonconservative Unknown E161K Nonconservative Unknown L541P Conservative Decreased ATP binding and ATPase activity50 P597S Nonconservative Unknown G618E Nonconservative Unknown V767D Nonconservative Decreased ABCR expression10 G863A Nonconservative Decreased ATPase activity50, 51 R943Q Nonconservative Decreased ATPase activity51 A1038V Conservative Decreased ATP binding and ATPase activity50 E1087K Nonconservative Decreased ATP binding50 V1433I Conservative Unknown R1640W Nonconservative Unknown A1794D Nonconservative Introduction charged aa in 10th transmembrane domain G1961E Nonconservative Decreased ATP binding and ATPase activity 50 V2050L Conservative Unknown D2177N Nonconservative Increased ATPase activity50 (B) Splice site mutation Effect on mRNARef Predicted effect on ABCR protein 768G4T Nonsense-mediated decay33 No protein IVS36+2T4C Unknown Truncation of exon 36 resulting in V1673fs? Login to comment