Updates for c.3415A>G:
2021-01-18 class updated from VUS to disease-causing, subclass: CFTR-RD-causing




Variant NM_000492.4:c.3415A>G


Variant details:
Name NM_000492.4:c.3415A>G
Protein name NP_000483.3:p.(Ile1139Val)
Genomic name (hg19)     chr7:g.117254714A>G    UCSC    
Genomic name (hg38) chr7:g.117614660A>G    UCSC
#Exon/intron exon 21
Legacy Name I1139V
Class disease-causing
Subclass CFTR-RD-causing
WT sequence TATTATCCTGACTTTAGCCATGAAT A TCATGAGTACATTGCAGTGGGCTGT
Mutant sequence TATTATCCTGACTTTAGCCATGAAT G TCATGAGTACATTGCAGTGGGCTGT

Other databases:

Not found		dbSNP
rs397508556



Pathogenicity predictors:

Functional studies:


Reference PMID Splicing mRNA level Maturation Localization Channel fonction (Cl-) Bicarbonate
Vankeerberghen et al, 1998 9804160 ✓ ✓


« ✓ » 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


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

TOTAL NUMBER OF PATIENTS 5
Asymptomatic compound heterozygote 1
CFTR-RD4
  • Bronchiectasis  2
  • CBAVD  2




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CBAVD 838heterozygoteCF-causing - Trans
CBAVD 4997heterozygoteCF-causing- Undef
Bronchiectasis 5679heterozygoteCF-causing - Trans
Bronchiectasis 5151heterozygoteVUS3 - Trans
Asymptomatic compound heterozygote 5161heterozygoteCF-causing - 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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