7-117592446-C-G

Variant names:

• chr7-117592446-C-G
• rs397508359
• NM_000492.4:c.2279C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000492.4(CFTR):​c.2279C>G​(p.Thr760Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000208 in 1,445,274 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T760M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CFTR NM_000492.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.537
• Publications: 6 publications found

Genes affected

CFTR (HGNC:1884): (CF transmembrane conductance regulator) This gene encodes a member of the ATP-binding cassette (ABC) transporter superfamily. The encoded protein functions as a chloride channel, making it unique among members of this protein family, and controls ion and water secretion and absorption in epithelial tissues. Channel activation is mediated by cycles of regulatory domain phosphorylation, ATP-binding by the nucleotide-binding domains, and ATP hydrolysis. Mutations in this gene cause cystic fibrosis, the most common lethal genetic disorder in populations of Northern European descent. The most frequently occurring mutation in cystic fibrosis, DeltaF508, results in impaired folding and trafficking of the encoded protein. Multiple pseudogenes have been identified in the human genome. [provided by RefSeq, Aug 2017]

CFTR Gene-Disease associations (from GenCC):

• cystic fibrosis

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), Myriad Women’s Health, Orphanet
• congenital bilateral absence of vas deferens

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary chronic pancreatitis

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 197 curated pathogenic missense variants (we use a threshold of 10). The gene has 46 curated benign missense variants. Gene score misZ: -3.1397 (below the threshold of 3.09). Trascript score misZ: -1.0868 (below the threshold of 3.09). GenCC associations: The gene is linked to hereditary chronic pancreatitis, cystic fibrosis, congenital bilateral absence of vas deferens.
• BP4: Computational evidence support a benign effect (MetaRNN=0.17369887).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CFTR	NM_000492.4	c.2279C>G	p.Thr760Arg	missense_variant	Exon 14 of 27	ENST00000003084.11	NP_000483.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CFTR	ENST00000003084.11	c.2279C>G	p.Thr760Arg	missense_variant	Exon 14 of 27	1	NM_000492.4	ENSP00000003084.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000422 AC: 1 AN: 236864 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000557

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000208 AC: 3 AN: 1445274 Hom.: 0 Cov.: 32 AF XY: 0.00000139 AC XY: 1 AN XY: 717488

African (AFR) AF: 0.00 AC: 0 AN: 32780

American (AMR) AF: 0.00 AC: 0 AN: 42308

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25000

East Asian (EAS) AF: 0.0000759 AC: 3 AN: 39524

South Asian (SAS) AF: 0.00 AC: 0 AN: 83580

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52924

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5636

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1103934

Other (OTH) AF: 0.00 AC: 0 AN: 59588

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.087
BayesDel_addAF	Benign	-0.030	T
BayesDel_noAF	Benign	-0.11
CADD	Benign	7.2
DANN	Benign	0.91
DEOGEN2	Uncertain	0.58	D;.;T;.
Eigen	Benign	-0.77
Eigen_PC	Benign	-0.86
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.81	T;T;T;T
M_CAP	Uncertain	0.19	D
MetaRNN	Benign	0.17	T;T;T;T
MetaSVM	Uncertain	-0.016	T
MutationAssessor	Uncertain	2.0	M;.;.;.
PhyloP100		0.54
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.98	N;.;N;.
REVEL	Uncertain	0.42
Sift	Benign	0.32	T;.;T;.
Sift4G	Benign	0.18	T;.;T;.
Polyphen		0.32	B;.;.;.
Vest4		0.35
MutPred		0.41		Gain of MoRF binding (P = 0.0141);.;.;.;
MVP		0.97
MPC		0.0047
ClinPred		0.14	T
GERP RS		1.5
Varity_R		0.061
gMVP		0.51
Mutation Taster		=18/82	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs397508359; hg19: chr7-117232500;