Updates for c.902A>G:
2021-01-18 subclass updated from VUS4 to VUS2




Variant NM_000492.4:c.902A>G


Variant details:
Name NM_000492.4:c.902A>G
Protein name NP_000483.3:p.(Tyr301Cys)
Genomic name (hg19)     chr7:g.117180186A>G    UCSC    
Genomic name (hg38) chr7:g.117540132A>G    UCSC
#Exon/intron exon 8
Legacy Name Y301C
Class VUS
Subclass VUS
WT sequence CTGAAACTGACTCGGAAGGCAGCCT A TGTGAGATACTTCAATAGCTCAGCC
Mutant sequence CTGAAACTGACTCGGAAGGCAGCCT G TGTGAGATACTTCAATAGCTCAGCC

Other databases:

Not found		dbSNP
rs150691494



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


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

TOTAL NUMBER OF PATIENTS 3
Asymptomatic compound heterozygote 2
CFTR-RD1
  • CBAVD  1




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
Asymptomatic compound heterozygote 5245heterozygoteVUS3 - Trans
Asymptomatic compound heterozygote 5255heterozygoteCFTR-RD-causing- Undef
CBAVD 4487heterozygote


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.



Go to CFTRare