Updates for c.3409A>G:
2025-12-30 Class updated from VUS to VUS non-CF (based on high frequency in the general population and patients data)




Variant NM_000492.4:c.3409A>G


Variant details:
Name NM_000492.4:c.3409A>G
Protein name NP_000483.3:p.(Met1137Val)
Genomic name (hg19)     chr7:g.117254708A>G    UCSC    
Genomic name (hg38) chr7:g.117614654A>G    UCSC
#Exon/intron exon 21
Legacy Name M1137V
Class VUS
Subclass non-CF
WT sequence AGTTGGTATTATCCTGACTTTAGCC A TGAATATCATGAGTACATTGCAGTG
Mutant sequence AGTTGGTATTATCCTGACTTTAGCC G TGAATATCATGAGTACATTGCAGTG

Other databases:

Not found		dbSNP
rs397508553



Pathogenicity predictors:



Response to modulators:


Modulator FDA approval EMA approval in vitro / ex vivo data clinical data
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


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

TOTAL NUMBER OF PATIENTS 4
Asymptomatic compound heterozygote 1
CFTR-RD3
  • Bronchiectasis  1
  • CBAVD  1
  • CRS-NP  1




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CRS-NP 5138heterozygote
Asymptomatic compound heterozygote 5218heterozygoteCFTR-RD-causing - Cis
VUS2 - Trans
Bronchiectasis 5669heterozygoteVUS3 - Trans
CBAVD 6223heterozygoteVUS3- Undef
varying clinical consequence- Undef


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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