rs756219310

Positions:

• chr7-117610598-T-C
• chr7-117610598-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_000492.4(CFTR):​c.3068T>C​(p.Ile1023Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CFTR NM_000492.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.94

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a domain ABC transmembrane type-1 2 (size 296) in uniprot entity CFTR_HUMAN there are 53 pathogenic changes around while only 8 benign (87%) in NM_000492.4
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CFTR	NM_000492.4	c.3068T>C	p.Ile1023Thr	missense_variant	19/27	ENST00000003084.11	NP_000483.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CFTR	ENST00000003084.11	c.3068T>C	p.Ile1023Thr	missense_variant	19/27	1	NM_000492.4	ENSP00000003084	P2
	ENST00000456270.1	n.178-5609A>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.084	D
BayesDel_noAF	Benign	-0.12
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.48	T;.;.;T;.
Eigen	Benign	0.053
Eigen_PC	Benign	0.21
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.81	T;T;T;T;T
M_CAP	Uncertain	0.15	D
MetaRNN	Uncertain	0.53	D;D;D;D;D
MetaSVM	Uncertain	0.026	D
MutationAssessor	Benign	1.4	L;.;.;.;.
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	0.15	N;.;.;N;.
REVEL	Uncertain	0.35
Sift	Benign	0.13	T;.;.;T;.
Sift4G	Benign	0.18	T;.;.;T;.
Polyphen		0.32	B;.;.;.;.
Vest4		0.52
MutPred		0.63		Gain of glycosylation at I1023 (P = 0.0208);.;.;.;.;
MVP		1.0
MPC		0.0042
ClinPred		0.69	D
GERP RS		6.2
Varity_R		0.25
gMVP		0.92

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs756219310; hg19: chr7-117250652;