ABCMdb

ABCC7 p.Glu664*

ClinVar:

c.1990G>T , p.Glu664* ? , not provided

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[hide] Characterization of disease-associated mutations a... Hum Mol Genet. 2003 Aug 15;12(16):2031-40. Aznarez I, Chan EM, Zielenski J, Blencowe BJ, Tsui LC
Characterization of disease-associated mutations affecting an exonic splicing enhancer and two cryptic splice sites in exon 13 of the cystic fibrosis transmembrane conductance regulator gene.
Hum Mol Genet. 2003 Aug 15;12(16):2031-40., 2003-08-15 [PMID:12913074]

Abstract [show]
Sequences in exons can play an important role in constitutive and regulated pre-mRNA splicing. Since exonic splicing regulatory sequences are generally poorly conserved and their mechanism of action is not well understood, the consequence of exonic mutations on splicing can only be determined empirically. In this study, we have investigated the consequence of two cystic fibrosis (CF) disease-causing mutations, E656X and 2108delA, on the function of a putative exonic splicing enhancer (ESE) in exon 13 of the CFTR gene. We have also determined whether five other CF mutations D648V, D651N, G654S, E664X and T665S located near this putative ESE could lead to aberrant splicing of exon 13. Using minigene constructs, we have demonstrated that the E656X and 2108delA mutations could indeed cause aberrant splicing in a predicted manner, supporting a role for the putative ESE sequence in pre-mRNA splicing. In addition, we have shown that D648V, E664X and T665S mutations could cause aberrant splicing of exon 13 by improving the polypyrimidine tracts of two cryptic 3' splice sites. We also provide evidence that the relative levels of two splicing factors, hTra2alpha and SF2/ASF, could alter the effect on splicing of some of the exon 13 disease mutations. Taken together, our results suggest that the severity of CF disease could be modulated by changes in the fidelity of CFTR pre-mRNA splicing.

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No. Sentence Comment
3 We have also determined whether five other CF mutations D648V, D651N, G654S, E664X and T665S located near this putative ESE could lead to aberrant splicing of exon 13. Login to comment
5 In addition, we have shown that D648V, E664X and T665S mutations could cause aberrant splicing of exon 13 by improving the polypyrimidine tracts of two cryptic 30 splice sites. Login to comment
101 ca/cftr/) mutations are located upstream and the E664X (2122 G!T) (33) and T655S (2125A!T) (http://www.genet. sickkids.on.ca/cftr/) mutations are located downstream of the ESE sequence (Fig. 3A). Login to comment
130 Both the E664X and T665S mutations were found to cause an increase in the D248 transcript (Fig. 3C, lanes 2 and 5, respectively) by 2and 5-fold, respectively (Fig. 3E). Login to comment
134 3C and E) added further support to the conclusion that E664X and T665S could cause skipping of the first 248 nucleotides of exon 13 by improving the polypyrimidine tract of the 248-cryptic 30 splice site. Login to comment
144 We next investigated the effect of co-transfection of an expression plasmid for SF2/ASF with the minigene reporters containing the D651N, E664X and T665S mutations. Login to comment
163 (C) RT-PCR analysis of COS-7 cell lines transfected with minigenes driven by the CMV promoter carrying the wild-type exon 13 sequence, WT, and E664X, 2123A!T, 2124G!T, T665S, 2123AGA!TTT, 2123A!G/2125A!G and 2126C!A mutations separated in a 2% agarose gel. Login to comment
176 We have also expanded the search for other relevant sequences to the splicing of exon 13 and analyzed the effect of five additional previously reported CFTR mutations, D648V, D651N, G654S, E664X and T665S. Login to comment
177 The aberrant splicing of exon 13 observed for D648V, E664X and T665S mutations is probably due to strengthening the polypyrimidine tract adjacent to one of two cryptic 30 splice sites, located at 195 and 248 nt, downstream of the native 30 splice site. Login to comment
186 Therefore, our results showing that two nonsense mutations, E656X and E664X, affect the splicing of exon 13 acquire particular importance. Login to comment
203 Minigenes carrying D651N, E664X and T665S mutations were transfected alone (noted by the minus sign) or co-transfected with SF2/ASF (noted by the plus sign). Login to comment
212 Conversely, SF2/ASF exacerbated the effect of D651N, E664X and T665S mutations on the splicing of exon 13. Login to comment
221 The mutations were reported to associate with CF phenotype [D648V (31), E656X (http:// www.genet.sickkids.on.ca/cftr/), 2108delA (27), E664X (33) and T665S (http://www.genet.sickkids.on.ca/cftr/)] or with pulmonary disease [D651N (32)]. Login to comment

[hide] Initial evaluation of a biochemical cystic fibrosi... J Inherit Metab Dis. 2010 Oct;33(Suppl 2):S263-71. Epub 2010 Aug 17. Sommerburg O, Lindner M, Muckenthaler M, Kohlmueller D, Leible S, Feneberg R, Kulozik AE, Mall MA, Hoffmann GF
Initial evaluation of a biochemical cystic fibrosis newborn screening by sequential analysis of immunoreactive trypsinogen and pancreatitis-associated protein (IRT/PAP) as a strategy that does not involve DNA testing in a Northern European population.
J Inherit Metab Dis. 2010 Oct;33(Suppl 2):S263-71. Epub 2010 Aug 17., [PMID:20714932]

Abstract [show]
BACKGROUND: Ethical concerns and disadvantages of newborn screening (NBS) for cystic fibrosis (CF) related to genetic testing have raised controversies and impeded implementation of CF NBS in some countries. In the present study, we used a prospective and sequential immunoreactive trypsinogene (IRT)/pancreatitis-associated protein (PAP) strategy, with IRT as first and PAP as second tier, and validated this biochemical approach against the widely used IRT/DNA protocol in a population-based NBS study in southwest Germany. METHODS: Prospective quantitation of PAP and genetic analysis for the presence of four mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene most prevalent in southwest Germany (F508del, R553X, G551D, G542X) were performed in all newborns with IRT > 99.0th percentile. NBS was rated positive when either PAP was >/=1.0 ng/mL and/or at least one CFTR mutation was detected. In addition, IRT > 99.9th percentile was also considered a positive rating. Positive rating led to referral to a CF centre for testing of sweat Cl(-) concentration. FINDINGS: Out of 73,759 newborns tested, 98 (0.13%) were positive with IRT/PAP and 56 (0.08%) with IRT/DNA. After sweat testing of 135 CF NBS-positive infants, 13 were diagnosed with CF. Detection rates were similar for both IRT/PAP and IRT/DNA. One of the 13 diagnosed CF newborns had a PAP concentration <1.0 ng/mL. CONCLUSIONS: Sequential measurement of IRT/PAP provides good sensitivity and specificity and allows reliable and cost-effective CF NBS which circumvents the necessity of genetic testing with its inherent ethical problems.

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No. Sentence Comment
110 In the second column, the results for both screening strategies are given CF patient True result for PAP/DNA Meconium ileus IRT (ng/ml) PAP (ng/ml) initial DNA result Age at referral (weeks) Mean of sweat Cl- measures (mmol/l) Age at diagnosis (weeks) Subsequent investigation Further DNA analysis 1 FN/FN No 36.0 n.d. n.d. 10 84 12 No special F508del/S1251N 2 TP/TP No 95.5 2.56 F508del/G542X 5 84 6 No special n.d. 3 TP/TP No 132.5 5.81 F508del/ - 4 95 5 No special n.d.a 4 TP/FN No 152.5 2.70 - / - 8b 44 10 ICMc CFTRdele2,3/ - c 5 TP/TP No 204.0 1.00 F508del/G551D 6 95 6 No special n.d. 6 TP/TP Yes 245.0 1.00 F508del/F508del - n.d.d 1 No special n.d. 7 TP/TP No 220.5 1.70 F508del/F508del 8b 82 10 No special n.d. 8 FN/FN No 139.0 0.95 - / - 15b 93 16 No special N1303K/R709X 9 TP/TP Yes 197.5 1.20 F508del/F508del - n.d.d 1 No special n.d. 10 TP/TP Yes 143.5 1.10 F508del/F508del - 92 1 No special n.d. 11 TP/TP No 114.0 1.45 F508del/ - 7b 116 7 No special F508del/p.Q552X 12 TP/TP No 174.5 2.60 F508del/F508del 4 88 5 No special n.d. 13 TP/TP Yes 81 1.30 F508del/F508del 1 n.d.d 1 No special n.d. 14 TP/FN No 198.5 9.45 - / - 8b 103 8 No special CFTRdele2,3/ E664X PAP IRT/PAP strategy, DNA IRT/DNA strategy, TP true positive, FN false negative a Further DNA analysis was not performed in the local CF centre after the health insurance of the patient refused to pay for further DNA analysis. Login to comment

[hide] Spectrum of CFTR mutations in cystic fibrosis and ... Hum Mutat. 2000;16(2):143-56. Claustres M, Guittard C, Bozon D, Chevalier F, Verlingue C, Ferec C, Girodon E, Cazeneuve C, Bienvenu T, Lalau G, Dumur V, Feldmann D, Bieth E, Blayau M, Clavel C, Creveaux I, Malinge MC, Monnier N, Malzac P, Mittre H, Chomel JC, Bonnefont JP, Iron A, Chery M, Georges MD
Spectrum of CFTR mutations in cystic fibrosis and in congenital absence of the vas deferens in France.
Hum Mutat. 2000;16(2):143-56., [PMID:10923036]

Abstract [show]
We have collated the results of cystic fibrosis (CF) mutation analysis conducted in 19 laboratories in France. We have analyzed 7, 420 CF alleles, demonstrating a total of 310 different mutations including 24 not reported previously, accounting for 93.56% of CF genes. The most common were F508del (67.18%; range 61-80), G542X (2.86%; range 1-6.7%), N1303K (2.10%; range 0.75-4.6%), and 1717-1G>A (1.31%; range 0-2.8%). Only 11 mutations had relative frequencies >0. 4%, 140 mutations were found on a small number of CF alleles (from 29 to two), and 154 were unique. These data show a clear geographical and/or ethnic variation in the distribution of the most common CF mutations. This spectrum of CF mutations, the largest ever reported in one country, has generated 481 different genotypes. We also investigated a cohort of 800 French men with congenital bilateral absence of the vas deferens (CBAVD) and identified a total of 137 different CFTR mutations. Screening for the most common CF defects in addition to assessment for IVS8-5T allowed us to detect two mutations in 47.63% and one in 24.63% of CBAVD patients. In a subset of 327 CBAVD men who were more extensively investigated through the scanning of coding/flanking sequences, 516 of 654 (78. 90%) alleles were identified, with 15.90% and 70.95% of patients carrying one or two mutations, respectively, and only 13.15% without any detectable CFTR abnormality. The distribution of genotypes, classified according to the expected effect of their mutations on CFTR protein, clearly differed between both populations. CF patients had two severe mutations (87.77%) or one severe and one mild/variable mutation (11.33%), whereas CBAVD men had either a severe and a mild/variable (87.89%) or two mild/variable (11.57%) mutations.

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Sentences [show]
No. Sentence Comment
109 h M1K, K14X, W19X, 211delG, G27E, R31C, 237insA, 241delAT, Q39X, 244delTA, 296+2T>C, 297-3C>T, W57X+F87L, 306delTAGA, P67L, A72D, 347delC, R75Q, 359insT, 394delT, 405+4A>G, Q98R, 457TAT>G, R117H+5T, R117H+I1027T, R117L, R117P, H139R, A141D, M152V, N186K, D192N, D192del, E193X, 711+1G>A, 711+3A>G, 712-1G>T, L206F, W216X, C225R, Q237E, G241R, 852del22, 876-14del12, 905delG, 993del5, E292K, Y304X, F311del, 1161delC, R347L, R352Q, W361R, 1215delG, S364P, S434X, D443Y, S466X, C491R, T501A, I506T, F508C, I507del+F508C, F508del+L467F, 1774delCT, R553G, 1802delC, 1806delA, A559E, Y563N, 1833delT, Y569C, Y569H, Y569X, G576X, G576A, T582I, 1898+3A>G+186-13C>G, 1918delGC, R600G, L610S, G628R, 2043delG, 2118del4, E664X, 2174insA, Q689X, K698R, K716X, L732X, 2347delG, 2372del8, R764X, 2423delG, S776X, 2634insT, 2640delT, C866Y, 2752-1G>T, W882X, Y913C, V920M, 2896insAG, H939D, H939R, D979V, D985H, D993Y, 3120G>A, I1005R, 3195del6, 3293delA, 3320ins5, W1063X, A1067T, 3359delCT, T1086I, W1089X, Y1092X+S1235R, W1098X, E1104X, R1128X, 3532AC>GTA, 3548TCAT>G, M1140del, 3600G>A, R1162L, 3667ins4, 3732delA+K1200E, S1206X, 3791delC, S1235R+5T, Q1238R, Q1238X, 3849+4A>G, T1246I, 3869insG, S1255P, R1283K, F1286S, 4005+1G>T, 4006-8T>A, 4015delA, N1303H, N1303I, 4172delGC, 4218insT, 4326delTC, Q1382X, 4375-1C>T, 4382delA, D1445N, CF40kbdel4-10, Cfdel17b. Login to comment

[hide] Identification of four novel mutations in the cyst... Hum Mutat. 1997;9(4):368-9. Clavel C, Pennaforte F, Pigeon F, Verlingue C, Birembaut P, Ferec C
Identification of four novel mutations in the cystic fibrosis transmembrane conductance regulator gene: E664X, 2113delA, 306delTAGA, and delta M1140.
Hum Mutat. 1997;9(4):368-9., [PMID:9101301]

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No. Sentence Comment
11 RESULTS Molecular defects were found in E664X, 2113delA, 306delTAGA, and aM1140. Login to comment
12 E664X A transversion GÃT at nucleotide position 2,122 was located in exon 13. Login to comment
31 Sequencing data of E664X, 306 del TAGA, and 2113 del A mutations. Login to comment

[hide] The cystic fibrosis gene: a molecular genetic pers... Cold Spring Harb Perspect Med. 2013 Feb 1;3(2):a009472. doi: 10.1101/cshperspect.a009472. Tsui LC, Dorfman R
The cystic fibrosis gene: a molecular genetic perspective.
Cold Spring Harb Perspect Med. 2013 Feb 1;3(2):a009472. doi: 10.1101/cshperspect.a009472., [PMID:23378595]

Abstract [show]
The positional cloning of the gene responsible for cystic fibrosis (CF) was the important first step in understanding the basic defect and pathophysiology of the disease. This study aims to provide a historical account of key developments as well as factors that contributed to the cystic fibrosis transmembrane conductance regulator (CFTR) gene identification work. A redefined gene structure based on the full sequence of the gene derived from the Human Genome Project is presented, along with brief reviews of the transcription regulatory sequences for the CFTR gene, the role of mRNA splicing in gene regulation and CF disease, and, various related sequences in the human genome and other species. Because CF mutations and genotype-phenotype correlations are covered by our colleagues (Ferec C, Cutting GR. 2012. Assessing the disease-liability of mutations in CFTR. Cold Spring Harb Perspect Med doi: 10.1101/cshperspect.a009480), we only attempt to provide an introduction of the CF mutation database here for reference purposes.

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No. Sentence Comment
105 Other examples of mutations affecting splicing efficiency include several missense (D648V and T665S) and nonsense(E664X)mutations,presumablyduetothe disruption of the ESE elements within exon 13 (Aznarez et al. 2003). Login to comment