Updates for c.2770G>A:
2020-03-26 Subclass changed from VUS1 to VUS4
2024-10-14 Class updated from VUS4 to unclassified /non-CF




Variant NM_000492.4:c.2770G>A


Variant details:
Name NM_000492.4:c.2770G>A
Protein name NP_000483.3:p.(Asp924Asn)
Genomic name (hg19)     chr7:g.117243698G>A    UCSC    
Genomic name (hg38) chr7:g.117603644G>A    UCSC
#Exon/intron exon 17
Legacy Name D924N
Class VUS
Subclass non-CF
WT sequence GTTTTACATTTACGTGGGAGTAGCC G ACACTTTGCTTGCTATGGGATTCTT
Mutant sequence GTTTTACATTTACGTGGGAGTAGCC A ACACTTTGCTTGCTATGGGATTCTT

Other databases:
dbSNP
rs201759207



Pathogenicity predictors:



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


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

TOTAL NUMBER OF PATIENTS 4
CF 1
CFTR-RD2
  • Pancreatitis  2
Pending non-CF 1




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CF 568heterozygoteCF-causing - Cis
CF-causing - Trans
Pancreatitis 5860heterozygoteCFTR-RD-causing- Undef
Pancreatitis 1945heterozygote
Pending non-CF 5970heterozygoteCF-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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