ABCMdb

ABCA4 p.Gln1332*

ClinVar:

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[hide] Spectrum of ABCR gene mutations in autosomal reces... Eur J Hum Genet. 1998 May-Jun;6(3):291-5. Rozet JM, Gerber S, Souied E, Perrault I, Chatelin S, Ghazi I, Leowski C, Dufier JL, Munnich A, Kaplan J
Spectrum of ABCR gene mutations in autosomal recessive macular dystrophies.
Eur J Hum Genet. 1998 May-Jun;6(3):291-5., [PMID:9781034]

Abstract [show]
Stargardt disease (STGD) and late-onset fundus flavimaculatus (FFM) are autosomal recessive conditions leading to macular degenerations in childhood and adulthood, respectively. Recently, mutations of the photoreceptor cell-specific ATP binding transporter gene (ABCR) have been reported in Stargardt disease. Here, we report on the screening of the whole coding sequence of the ABCR gene in 40 unrelated STGD and 15 FFM families and we show that mutations truncating the ABCR protein consistently led to STGD. Conversely, all mutations identified in FFM were missense mutations affecting uncharged amino acids. These results provide the first genotype-phenotype correlations in ABCR gene mutations.

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45 Furthermore, all ABCR missense mutations Table 1 Mutations in the ABCR gene in STGD and FFM families Conserved aa in: Nucleotide change Amino acid change Domain ABCs RmP Phenotype Families Comment (571-2)A®G splicing mutation STGD 1 HAD1 (1938-2)A®G splicing mutation STGD 1 (4668+2)T®C splicing mutation STGD 1 (4735+2)T®A splicing mutation STGD 1 del(5196+1-5196+6 splicing mutation STGD 1 LOZ2 2570 delT frameshift mutation STGD 1 3209insGT frameshift mutation STGD 2 CHE2 G3754T E1252X STGD 1 C3994T Q1332X STGD 1 C6337G I2113X STGD 1 JEG2 C52T R18W IC - + STGD 1 C634T R212C EC - + STGD 5 GEN2, JEG2 G1908T Q636H IC - + STGD 1 LOZ2 C3056T T1019M IC - + STGD 1 C3322T R1107C IC - + STGD 1 JUL2 C4916T R1640W IC + + STGD 2 MAR1 G5929A G1977S ATP2 + + STGD 1 GEN2 G6320A R2107H IC + + STGD 1 JUL2 C3114T A1038V IC - + STGD 2 CHE2 +FFM +1 VII2 T1622C L541P EC - + FFM 1 VII2 T31C L11P IC + + FFM 1 G3272A G1090E IC + + FFM 1 G4522T G1508C IC + + FFM 1 C5908T L1970F IC + + FFM 1 GON2 T5912G L1971R IC + + FFM 1 GON2 Mutations refer to the standard nomenclature. Login to comment

[hide] Novel mutations in of the ABCR gene in Italian pat... Eye (Lond). 2010 Jan;24(1):158-64. Epub 2009 Mar 6. Passerini I, Sodi A, Giambene B, Mariottini A, Menchini U, Torricelli F
Novel mutations in of the ABCR gene in Italian patients with Stargardt disease.
Eye (Lond). 2010 Jan;24(1):158-64. Epub 2009 Mar 6., [PMID:19265867]

Abstract [show]
PURPOSE: Stargardt disease (STGD) is the most prevalent juvenile macular dystrophy, and it has been associated with mutations in the ABCR gene, encoding a photoreceptor-specific transport protein. In this study, we determined the mutation spectrum in the ABCR gene in a group of Italian STGD patients. METHODS: The DNA samples of 71 Italian patients (from 62 independent pedigrees), affected with autosomal recessive STGD, were analysed for mutations in all 50 exons of the ABCR gene by the DHPLC approach (with optimization of the DHPLC conditions for mutation analysis) and direct sequencing techniques. RESULTS: In our group of STGD patients, 71 mutations were identified in 68 patients with a detection rate of 95.7%. Forty-three mutations had been already reported in the literature, whereas 28 mutations had not been previously described and were not detected in 150 unaffected control individuals of Italian origin. Missense mutations represented the most frequent finding (59.2%); G1961E was the most common mutation and it was associated with phenotypes in various degrees of severity. CONCLUSIONS: Some novel mutations in the ABCR gene were reported in a group of Italian STGD patients confirming the extensive allelic heterogeneity of this gene-probably related to the vast number of exons that favours rearrangements in the DNA sequence.

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57 Table 2 Summary of the mutations identified in the ABCR gene in our series of STGD Italian patients Patient Allele 1 mutation Allele 2 mutation S 1 R212C T1019M S 8 V1433I V1433I S 21 A1598D A1598D S 33 N96K G978D S 56 A1598D G1961E S 70 R212C T1019M S 71 W700X WT S 74 6750delA V767D S 77 G1961E WT S 82 Q21X G1961E S 106 C1177X G1961E S 107 C1177X G1961E S 114 T970P-F1015E - S 115 T970P-F1015E - S 120 N415K G1961E S 162 324-327insT 324-327insT S 181 W1408X G1961E S 190 C1177X A1598D S 201 G1961E WT S 202 Q21X T970P-F1015E S 213 M840R G1961E S 231 WT WT S 236 C1177X G1961E S 237 WT WT S 241 V256 splice WT S 246 IVS6-1g4t R1108C S 260 L2221P 5109delG-I156V S 321 IVS9 þ 1G4C S1099X S 328 IVS42 þ 4delG IVS35 þ 2t4c S 346 E2096K WT S 347 IVS28 þ 5g4a WT S 353 P1484S-G1961E P68L S 354 P1484S-G1961E P68L S 355 P1484S-G1961E P68L S 360 G1961E 5961delGGAC S 364 IVS35 þ 2t4c G1961E S 365 L541P/A1038V G1961E S 377 IVS42 þ 4delG IVS35 þ 2t4c S 380 R653C WT S 413 R212C T1019M S 414 A1598D G1961E S 417 G1078E G1961E S 438 R1055W WT S 440 4021ins24bp T1526M-G1961E S 449 W1479X L2140Q S 450 W1479X L2140Q S 474 W1461X G 1977S S 486 WT WT S 492 R1098C/L1970F 6548insTGAA S 528 T977P IVS40 þ 5g4a S 531 G690V Q1332X S 532 R572X L1473M-4733delGTTT S 535 IVS40 þ 5g4a 5917delG S 550 IVS40 þ 5g4a 6750delA S 555 250insCAAA WT S 556 250insCAAA WT S 575 N96H G1961E S 590 W821R IVS40 þ 5g4a S 592 V931M R1108C S 593 V767D R2030X Table 2 (Continued ) Patient Allele 1 mutation Allele 2 mutation S 594 G172S G1961E S 602 P1380L G1961E S 607 E616K L1580S-K2172R S 640 250insCAAA S1696N S 694 IVS35 þ 2t4c G1961E S 725 IVS13 þ 1g4a Q1376 splice S 731 L541P-A1038V G1961E S 755 N965S IVS40 þ 5g4a S 789 E1087K G1977S S 968 T1019M G1961E S 992 R212C G1961E Bold values indicate novel mutations. Login to comment