CFTR-France

**Updates for c.1680-99T>C:**
2025-11-07	Class updated from VUS to likely benign (based on patients data)

Variant details:
Name	NM_000492.4:c.1680-99T>C
Protein name	NP_000483.3:p.(=)
Genomic name (hg19)	chr7:g.117230308T>C UCSC
Genomic name (hg38)	chr7:g.117590254T>C UCSC
#Exon/intron	intron 12
Legacy Name	1812- 99 T- >C
Class	likely benign
WT sequence	TTTCAGTGAATCGATGTGGTGACCA T ATTGTAATGCATGTAGTGAACTGTT
Mutant sequence	TTTCAGTGAATCGATGTGGTGACCA C ATTGTAATGCATGTAGTGAACTGTT

Other databases:
	Not found	dbSNP no rs

Pathogenicity predictors:
Not found

No patient found in CFTR-NGS catalogue

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

TOTAL NUMBER OF PATIENTS	2
CFTR-RD	2 CBAVD 1 CRS-NP 1

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

Detailed genotypes:
Phenotype	Patient ID	Variant status	Additional variants
CBAVD	3125	heterozygote	CF-causing- Undef varying clinical consequence- Undef
CRS-NP	3161	heterozygote	CF-causing- Undef varying clinical consequence- 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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