ABCMdb

ABCC7 p.Leu541Pro

CF databases:	c.1622T>C , p.Leu541Pro (CFTR1) ? ,
Predicted by SNAP2:	A: D (80%), C: D (66%), D: D (91%), E: D (91%), F: D (75%), G: D (91%), H: D (85%), I: N (87%), K: D (91%), M: D (59%), N: D (91%), P: D (91%), Q: D (85%), R: D (91%), S: D (85%), T: D (85%), V: N (78%), W: D (85%), Y: D (85%),
Predicted by PROVEAN:	A: D, C: D, D: D, E: D, F: D, G: D, H: D, I: N, K: D, M: N, N: D, P: D, Q: D, R: D, S: D, T: D, V: N, W: D, Y: D,

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[hide] Molecular analysis of the cystic fibrosis gene rev... Mol Hum Reprod. 1999 Jan;5(1):10-3. Lissens W, Mahmoud KZ, El-Gindi E, Abdel-Sattar A, Seneca S, Van Steirteghem A, Liebaers I
Molecular analysis of the cystic fibrosis gene reveals a high frequency of the intron 8 splice variant 5T in Egyptian males with congenital bilateral absence of the vas deferens.
Mol Hum Reprod. 1999 Jan;5(1):10-3., [PMID:10050655]

Abstract [show]
It has previously been shown that defects in the cystic fibrosis transmembrane conductance regulator (CFTR) gene are largely responsible for the condition of congenital bilateral absence of the vas deferens (CBAVD), without associated renal abnormalities, in Caucasian populations. To assess the involvement of the CFTR in CBAVD in a population with presumed low cystic fibrosis (CF) frequency, we have analysed 20 CBAVD males from Egypt for the presence of 12 common Caucasian CFTR mutations and the intron 8 5T splice variant, IVS-5T, known to be a major cause of CBAVD in Caucasian patients. In 16 of the males without associated renal abnormalities only one deltaF508 carrier was identified, but an exceptionally high frequency of the IVS-5T variant was found (14 of 32 alleles or 43.7%), confirming that this variant is involved in many cases of CBAVD, even in populations where CF is rare. CFTR mutations or the IVS-5T variant were found neither in the remaining four patients with associated renal abnormalities nor in the spouses of the 20 CBAVD patients. However, one patient was homozygous for a leucine to proline substitution at amino acid position 541 (L541P) of the CFTR. It is as yet not clear whether this change is involved in CBAVD in this male.

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4 CFTR mutations or the IVS-5T variant were found neither in the remaining four patients with associated renal abnormalities nor in the spouses of the 20 CBAVD patients. However, one patient was homozygous for a leucine to proline substitution at amino acid position 541 (L541P) of the CFTR. Login to comment
35 Screening for the presence of the L541P change was done by restriction enzyme digestion of the PCR amplified exon 11 (with primers 11i5 and 11i3) with ScrFI. Login to comment
41 Screening for the presence of the 1754T→C substitution (amino acid change leucine to proline at position 541 or L541P) in exon 11 of the CFTR gene by ScrFI restriction analysis. Login to comment
54 PCR amplification and sequencing of the whole coding region of exon 11 showed that he was homozygous for a T to C substitution at cDNA position 1754 of the CFTR (1754T→C), predicting an amino acid change of leucine to proline at amino acid position 541 (L541P). Login to comment
56 Since this substitution would probably not be detected in heterozygotes with a normal and an L541P allele, another approach, based on the creation of an additional ScrFI restriction site in the PCR fragment defined by primers 11i5 and 11i3, was used to screen for it in the other individuals (Figure 1). Login to comment
63 bIncluding the L541P homozygote and heterozygote female. Login to comment
65 The L541P change was found on a 7T background. Login to comment
83 These results are in agreement with a proposed different, but as yet unidentified, aetiology of the condition of CBAVD in these patients. However, one patient was homozygous for an L541P substitution in the CFTR gene, a change that so far has not been described either as a polymorphism or as a mutation. Login to comment
84 The L541P substitution is in the first nucleotide binding fold of the CFTR and would be localized, according to the model of Hyde et al. (1990), in the third β-sheet of the ATP-binding cassette (ABC) of the protein. Login to comment

[hide] ABCA4 mutations causing mislocalization are found ... Hum Mol Genet. 2005 Oct 1;14(19):2769-78. Epub 2005 Aug 15. Wiszniewski W, Zaremba CM, Yatsenko AN, Jamrich M, Wensel TG, Lewis RA, Lupski JR
ABCA4 mutations causing mislocalization are found frequently in patients with severe retinal dystrophies.
Hum Mol Genet. 2005 Oct 1;14(19):2769-78. Epub 2005 Aug 15., [PMID:16103129]

Abstract [show]
ABCA4, also called ABCR, is a retinal-specific member of the ATP-binding cassette (ABC) family that functions in photoreceptor outer segments as a flipase of all-trans retinal. Homozygous and compound heterozygous ABCA4 mutations are associated with various autosomal recessive retinal dystrophies, whereas heterozygous ABCA4 mutations have been associated with dominant susceptibility to age-related macular degeneration in both humans and mice. We analyzed a cohort of 29 arRP families for the mutations in ABCA4 with a commercial microarray, ABCR-400 in addition to direct sequencing and segregation analysis, and identified both mutant alleles in two families (7%): compound heterozygosity for missense (R602W) and nonsense (R408X) alleles and homozygosity for a complex [L541P; A1038V] allele. The missense mutations were analyzed functionally in the photoreceptors of Xenopus laevis tadpoles, which revealed mislocalization of ABCA4 protein. These mutations cause retention of ABCA4 in the photoreceptor inner segment, likely by impairing correct folding, resulting in the total absence of physiologic protein function. Patients with different retinal dystrophies harboring two misfolding alleles exhibit early age-of-onset (AO) (5-12 years) of retinal disease. Our data suggest that a class of ABCA4 mutants may be an important determinant of the AO of disease.

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137 We hypothesized that the disease-associated missense mutations [L541P; A1038V], R602W and C1490Y could exert a possible effect on protein processing as this mechanism, which prevents altered proteins from locating to its physiologic compartment, was documented for other ABC transporters in related diseases including cystic fibrosis (CFTR) and Tangier disease (ABCA1). Login to comment

[hide] Cystic fibrosis genetic counseling difficulties du... J Cyst Fibros. 2012 Jul;11(4):344-8. doi: 10.1016/j.jcf.2012.01.004. Epub 2012 Feb 11. Poulou M, Fylaktou I, Fotoulaki M, Kanavakis E, Tzetis M
Cystic fibrosis genetic counseling difficulties due to the identification of novel mutations in the CFTR gene.
J Cyst Fibros. 2012 Jul;11(4):344-8. doi: 10.1016/j.jcf.2012.01.004. Epub 2012 Feb 11., [PMID:22326559]

Abstract [show]
BACKGROUND: The Cystic Fibrosis database includes amongst the 1893 gene mutations and polymorphisms a lot of missense mutations, the disease status of which still remains unproven. In populations with high rates of CFTR mutation heterogeneity, molecular diagnosis is difficult often causing counseling difficulties especially in cases of rare and/or novel mutations. METHODS: Approaches to counseling in cases of novel variants. RESULTS: Thirty-seven novel variants (4 synonymous, 24 missense, 2 frameshift and 10 intronic substitutions) were identified and evaluated with the help of in silico tools. CONCLUSIONS: In a diagnostic environment the answers have to be given within a specific timeframe, the in silico tools in combination with the phenotype offer some help but their diagnostic value is limited and cannot be used in isolation for the determination of the severity of the mutation.

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37 The azoospermic male (case 3) (sweat chloride test 90 meq/L) was compound heterozygote for p.Asn1303Lys [N1303K] and the novel variant p.Leu541Pro, in trans, described as pathogenic by the four in silico methods, and predicted to alter enhancer and silencer motifs (Table 2). Login to comment
38 In this case we can conclude that p.Leu541Pro in combination with a severe mutation will result in a CFTR-related phenotype. Login to comment
59 Case Exon or intron (legacy) Nucleotide change Mutation Other findings Polyphen-2 SIFT Pmut Mutation T@sting Phenotype 1 4 (4) c.405_406dupAC p.Leu136HisfsX18 p.F508del (in trans) N/A N/A N/A Disease causing Classic CF 2 23 (20) c.3815_3816delTG p.Ser1273LeufsX28 p.F508del (in trans) N/A N/A N/A Disease causing Classic CF 3 12 (11) c.1622TNC p.Leu541Pro p.N1303K (in trans) Prob. Dam. NT 0.00 Path. (6) Disease causing Azoospermia 4 17 (15) c.2806CNA p.Pro936Thr p.L1227L Prob. Dam. NT 0.03 Path. (4) Disease causing Inadequate weight gain 5 9 (8) c.1133ANG p.Gln378Arg Prob. Dam. T 0.11 Neut. Login to comment
72 Mutation Nucleotide change ESEfinder (WT/MUT) HSF (WT/MUT) Mutation T@ster (WT/MUT) p.L541P c.1622TNC Increased score for 5SS_U2_human (3.48/5.16)/increased score for SC35 (3.48/3.89) Creation of ESE motifs/creation and disruption of ESS motifs Donor gained (0.59) p.P936T c.2806CNA Decreased score for 5SS_U2_human (4.07/3.97)/decreased score for SC35 (4.00/2.72) Increased branch point motif (53.55/83.18)/disruption of ESE motifs No change on splice sites p.Q378R c.1133ANG No change Disruption of ESE motifs/creation of ESS motifs Donor gained (0.94) p.S945Y c.1484CNA Change for SRp40 best hit (4.6/5.76) Disruption of ESE motifs/disruption of ESS motifs Donor increased (0.30/0.91) p.M1R c.2TNG Reduced score for SRp55 (4.34/3.51) Disruption of ESE motifs Acceptor lost/donor increased (0.48 /0.56) p.M595V c.1783ANG No change Donor ss increased (46.9/73.74) if used causes exon skipping. Login to comment
74 Mutation Nucleotide change ESEfinder (WT/MUT) HSF (WT/MUT) Mutation T@ster (WT/MUT) p.L541P c.1622TNC Increased score for 5SS_U2_human (3.48/5.16)/increased score for SC35 (3.48/3.89) Creation of ESE motifs/creation and disruption of ESS motifs Donor gained (0.59) p.P936T c.2806CNA Decreased score for 5SS_U2_human (4.07/3.97)/decreased score for SC35 (4.00/2.72) Increased branch point motif (53.55/83.18)/disruption of ESE motifs No change on splice sites p.Q378R c.1133ANG No change Disruption of ESE motifs/creation of ESS motifs Donor gained (0.94) p.S945Y c.1484CNA Change for SRp40 best hit (4.6/5.76) Disruption of ESE motifs/disruption of ESS motifs Donor increased (0.30/0.91) p.M1R c.2TNG Reduced score for SRp55 (4.34/3.51) Disruption of ESE motifs Acceptor lost/donor increased (0.48 /0.56) p.M595V c.1783ANG No change Donor ss increased (46.9/73.74) if used causes exon skipping. Login to comment