Updates for c.523A>G:
2015-07-03 class changed from unclassified to disease-causing




Variant NM_000492.4:c.523A>G


Variant details:
Name NM_000492.4:c.523A>G
Protein name NP_000483.3:p.(Ile175Val)
Genomic name (hg19)     chr7:g.117174363A>G    UCSC    
Genomic name (hg38) chr7:g.117534309A>G    UCSC
#Exon/intron exon 5
Legacy Name I175V
Class disease-causing
Subclass CF-causing
WT sequence GCTGTCAAGCCGTGTTCTAGATAAA A TAAGTATTGGACAACTTGTTAGTCT
Mutant sequence GCTGTCAAGCCGTGTTCTAGATAAA G TAAGTATTGGACAACTTGTTAGTCT

Other databases:

Not found		dbSNP
rs397508744



Pathogenicity predictors:

Functional studies:


Reference PMID Splicing mRNA level Maturation Localization Channel fonction (Cl-) Bicarbonate
Seibert et al, 1997 9305991 ✓ ✓ ✓
Caputo et al, 2009 19491324 ✓ ✓
Bergougnoux et al, 2022 36567205 ✓ ✓ ✓ ✓ ✓


« ✓ » indicates the type of analysis performed and not the results


Response to modulators:


Modulator FDA approval EMA approval in vitro / ex vivo data clinical data
IVA yesnoyesno
TEZ-IVA yesnoyesno
ELX-TEZ-IVA yesnoyesno
VNZ-TEZ-DIVA yesnoyesno

clinical and functional data presented above are provided by Vertex


No patient found in CFTR-NGS catalogue


2 patients carrying this variant are reported in CFTR-France:

TOTAL NUMBER OF PATIENTS 2
CF 2




Color code:   non disease-causing <   likely benign <   VUS <   likely pathogenic <   disease-causing

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CF 992homozygotec.523A>G - p.(Ile175Val) - Trans
CF 993homozygotec.523A>G - p.(Ile175Val) - Trans


Color code:   non disease-causing <   likely benign <   VUS <   likely pathogenic <   disease-causing



            CFTR variants are clustered into five groups (click here for more details about the classification of variants):
  • CF-causing: when in trans with another CF-causing mutation, will result in CF.
  • CFTR-RD causing: when in trans with a CF-causing mutation, will result in CFTR-related disorders (CFTR-RD) such as chronic pancreatitis, bronchiectasis, CRS-NP (chronic rhinosinusitis with or without nasal polyposis) or CBAVD (congenital absence of vas deferens), according to Bombieri C et al., 2011.
  • Varying clinical consequence: when in trans with another CF-causing mutation, can either result in CF or in a CFTR-RD.
  • Non disease-causing: when in trans with a CF-causing mutation, will not cause CF, nor CFTR-RD.
  • VUS (Variant of unknown clinical significance): unclassified because of insufficient data.



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