Variant NM_000492.4:c.2758G>A


Variant details:
Name NM_000492.4:c.2758G>A
Protein name NP_000483.3:p.(Val920Met)
Genomic name (hg19) chr7:g.117243686G>A    UCSC    
#Exon/intron exon 17
Legacy Name V920M
Class likely pathogenic
Subclass likely CFTR-RD
WT sequence TTCGTATTATGTGTTTTACATTTAC G TGGGAGTAGCCGACACTTTGCTTGC
Mutant sequence TTCGTATTATGTGTTTTACATTTAC A TGGGAGTAGCCGACACTTTGCTTGC

Other databases:

Not found		dbSNP
rs373885282



Pathogenicity predictors:





No patient found in CFTR-NGS catalogue


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

TOTAL NUMBER OF PATIENTS 8
CF 2
CFTR-RD5
  • CBAVD  4
  • Pancreatitis  1
Pending (NBS) 1




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CBAVD 5809heterozygotelikely CFTR-RD- Undef
VUS3- Undef
CBAVD 1509heterozygotelikely CFTR-RD- Undef
varying clinical consequence- Undef
CBAVD 4634heterozygoteCF-causing- Undef
likely CFTR-RD- Undef
CBAVD 5787heterozygoteCFTR-RD-causing- Undef
likely CFTR-RD- Undef
CF 2557heterozygotelikely CFTR-RD - Cis
VUS3 - Cis
CF-causing - Trans
CF 2558heterozygotelikely CFTR-RD - Cis
VUS3 - Cis
CF-causing - Trans
Pancreatitis 4635heterozygoteCF-causing- Undef
likely CFTR-RD- Undef
Pending (NBS) 5801heterozygotelikely CFTR-RD - Cis
CF-causing - Trans


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



            CFTR variants are clustered into five groups:
  • 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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