Variant NM_000492.4:c.1853T>A


Variant details:
Name NM_000492.4:c.1853T>A
Protein name NP_000483.3:p.(Ile618Asn)
Genomic name (hg19)     chr7:g.117232074T>A    UCSC    
Genomic name (hg38) chr7:g.117592020T>A    UCSC
#Exon/intron exon 14
Legacy Name I618N
Class VUS
WT sequence TTAAAGAAAGCTGACAAAATATTAA T TTTGCATGAAGGTAGCAGCTATTTT
Mutant sequence TTAAAGAAAGCTGACAAAATATTAA A TTTGCATGAAGGTAGCAGCTATTTT

Other databases:

Not found		 dbSNP
no rs



Pathogenicity predictors:




Response to modulators:         +


Reference PMID Modulator in vitro / ex vivo data Clinical data Variant responsiveness
Burgel et al., 2024 39151434 ELX-TEZ-IVAN.D. yes yes

variant responsiveness based on clinical data, sweat chloride concentration, ppFEV1, chest CT imaging before and after ETI treatment (n=2 patients for 6-8 weeks)


No patient found in CFTR-NGS catalogue


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

TOTAL NUMBER OF PATIENTS 2
CF 2




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

Detailed genotypes:
Phenotype Patient ID Variant status Additional variants
CF 6432heterozygoteCF-causing- Undef
CF 5770heterozygoteCF-causing- 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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