Updates for c.1655A>C:
2024-08-13 Class updated from VUS3 to disease-causing/ NULL
2024-10-14 Class updated from VUS3 to Likely pathogenic/likely CF




Variant NM_000492.4:c.1655A>C


Variant details:
Name NM_000492.4:c.1655A>C
Protein name NP_000483.3:p.(Gln552Pro)
Genomic name (hg19)     chr7:g.117227863A>C    UCSC    
Genomic name (hg38) chr7:g.117587809A>C    UCSC
#Exon/intron exon 12
Legacy Name Q552P
Class likely pathogenic
Subclass likely CF
WT sequence GGTGGAATCACACTGAGTGGAGGTC A ACGAGCAAGAATTTCTTTAGCAAGG
Mutant sequence GGTGGAATCACACTGAGTGGAGGTC C ACGAGCAAGAATTTCTTTAGCAAGG

Other databases:

Not found
Not found		dbSNP
no rs



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
CF 3
Pending (NBS) 1




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CF 5710heterozygoteCF-causing - Trans
CF 6324homozygotec.1655A>C - p.(Gln552Pro) - Trans
CF 6391homozygotec.1655A>C - p.(Gln552Pro) - Trans
Pending (NBS) 5786heterozygoteCF-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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