ABCA4 p.Glu2132Lys
| Predicted by SNAP2: | A: N (57%), C: N (61%), D: N (78%), F: N (53%), G: N (57%), H: N (57%), I: N (57%), K: N (53%), L: N (53%), M: N (53%), N: N (66%), P: N (57%), Q: N (61%), R: N (53%), S: N (66%), T: N (66%), V: N (61%), W: D (71%), Y: N (53%), |
| Predicted by PROVEAN: | A: D, C: D, D: D, F: D, G: D, H: D, I: D, K: D, L: D, M: D, N: D, P: D, Q: D, R: D, S: D, T: D, V: D, W: D, Y: D, |
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[hide] Next-generation sequencing applied to a large Fren... Orphanet J Rare Dis. 2015 Jun 24;10:85. doi: 10.1186/s13023-015-0300-3. Boulanger-Scemama E, El Shamieh S, Demontant V, Condroyer C, Antonio A, Michiels C, Boyard F, Saraiva JP, Letexier M, Souied E, Mohand-Said S, Sahel JA, Zeitz C, Audo I
Next-generation sequencing applied to a large French cone and cone-rod dystrophy cohort: mutation spectrum and new genotype-phenotype correlation.
Orphanet J Rare Dis. 2015 Jun 24;10:85. doi: 10.1186/s13023-015-0300-3., [PMID:26103963]
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BACKGROUND: Cone and cone-rod dystrophies are clinically and genetically heterogeneous inherited retinal disorders with predominant cone impairment. They should be distinguished from the more common group of rod-cone dystrophies (retinitis pigmentosa) due to their more severe visual prognosis with early central vision loss. The purpose of our study was to document mutation spectrum of a large French cohort of cone and cone-rod dystrophies. METHODS: We applied Next-Generation Sequencing targeting a panel of 123 genes implicated in retinal diseases to 96 patients. A systematic filtering approach was used to identify likely disease causing variants, subsequently confirmed by Sanger sequencing and co-segregation analysis when possible. RESULTS: Overall, the likely causative mutations were detected in 62.1 % of cases, revealing 33 known and 35 novel mutations. This rate was higher for autosomal dominant (100 %) than autosomal recessive cases (53.8 %). Mutations in ABCA4 and GUCY2D were responsible for 19.2 % and 29.4 % of resolved cases with recessive and dominant inheritance, respectively. Furthermore, unexpected genotype-phenotype correlations were identified, confirming the complexity of inherited retinal disorders with phenotypic overlap between cone-rod dystrophies and other retinal diseases. CONCLUSIONS: In summary, this time-efficient approach allowed mutation detection in the most important cohort of cone-rod dystrophies investigated so far covering the largest number of genes. Association of known gene defects with novel phenotypes and mode of inheritance were established.
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99 Table 1 Summary of 43 patients carrying pathogenic and likely pathogenic mutations in known CCRD genes ID Type Consang. Gene NM Allele State Exon cDNA Protein Coseg. Conservation Polyphen2 Sift Mutation taster References High confidence CIC00137 simplex ABCA4 NM_000350.2 Ho 47 c.6394G>A p.(E2132K) + Highly Prd D Dc Novel CIC00765 Ar + ABCA4 NM_000350.2 Ho 47 c.6445C>T p.(R2149*) + - - - - (Lewis et al. 1999) (rs61750654) CIC03436 Ar + ABCA4 NM_000350.2 Ho 42 c.5892del p.(G1965Efs*9) Np - - - - a CIC04412 simplex ABC4A NM_000350.2 Het 34 c.4793C>A p.(A1598D) + Weakly Pd T Dc (Maugeri et al. 2000) (rs61750155) ABCA4 NM_000350.2 Het 28 c.4234C>T p.(Q1412*) + - - - - (Maugeri et al. 2000) (rs61750137) CIC04645 Ar + ABCA4 NM_000350.2 Ho 13 c.1924T>C p.(F642L) Np Moderately B D Dc Novel, but c.1924T>A p.F642I in (Jin et al. 2014) [80] CIC05087 simplex ABCA4 NM_000350.2 Ho IVS 11 c.1554+1G>C r.(spl?)
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ABCA4 p.Glu2132Lys 26103963:99:291
status: NEW