rs1799979

Positions:

• chr16-23380659-C-G
• chr16-23380659-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000336.3(SCNN1B):​c.1781C>G​(p.Thr594Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,460,388 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 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. T594M) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: SCNN1B NM_000336.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.868

Genes affected

SCNN1B (HGNC:10600): (sodium channel epithelial 1 subunit beta) Nonvoltage-gated, amiloride-sensitive, sodium channels control fluid and electrolyte transport across epithelia in many organs. These channels are heteromeric complexes consisting of 3 subunits: alpha, beta, and gamma. This gene encodes the beta subunit, and mutations in this gene have been associated with pseudohypoaldosteronism type 1 (PHA1), and Liddle syndrome. [provided by RefSeq, Apr 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0456025).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCNN1B	NM_000336.3	c.1781C>G	p.Thr594Arg	missense_variant	13/13	ENST00000343070.7	NP_000327.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCNN1B	ENST00000343070.7	c.1781C>G	p.Thr594Arg	missense_variant	13/13	1	NM_000336.3	ENSP00000345751	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000808 AC: 2 AN: 247544 Hom.: 0 AF XY: 0.0000149 AC XY: 2 AN XY: 134392

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000179

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1460388 Hom.: 0 Cov.: 32 AF XY: 0.00000688 AC XY: 5 AN XY: 726428

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000450

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	1.8
DANN	Benign	0.70
DEOGEN2	Benign	0.15	T;.;.;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.054	N
LIST_S2	Benign	0.41	T;T;T;T
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.046	T;T;T;T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	1.8	L;.;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.35	N;N;N;N
REVEL	Benign	0.15
Sift	Benign	0.29	T;T;T;T
Sift4G	Benign	0.43	T;T;T;T
Polyphen		0.39	B;.;.;.
Vest4		0.10
MutPred		0.19		Loss of phosphorylation at T594 (P = 0.0098);.;.;.;
MVP		0.63
MPC		0.19
ClinPred		0.10	T
GERP RS		-4.9
Varity_R		0.046
gMVP		0.55

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

Publications

LitVar

Other links and lift over

dbSNP: rs1799979; hg19: chr16-23391980;