12-6374543-G-C

Variant names:

• chr12-6374543-G-C
• rs61759860
• NM_001038.6:c.241C>G

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_001038.6(SCNN1A):​c.241C>G​(p.Arg81Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,862 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. R81C) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SCNN1A NM_001038.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.86
• Publications: 0 publications found

Genes affected

SCNN1A (HGNC:10599): (sodium channel epithelial 1 subunit alpha) 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 alpha subunit, and mutations in this gene have been associated with pseudohypoaldosteronism type 1 (PHA1), a rare salt wasting disease resulting from target organ unresponsiveness to mineralocorticoids. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Apr 2009]

SCNN1A Gene-Disease associations (from GenCC):

• pseudohypoaldosteronism, type IB1, autosomal recessive

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Laboratory for Molecular Medicine, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• bronchiectasis with or without elevated sweat chloride 2

  Inheritance: Unknown, AD Classification: STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Ambry Genetics
• Brugada syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Liddle syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Liddle syndrome 3

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-6374543-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 9270.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.76

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001038.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCNN1A	NM_001038.6	MANE Select	c.241C>G	p.Arg81Gly	missense	Exon 2 of 13	NP_001029.1
	SCNN1A	NM_001159576.2		c.418C>G	p.Arg140Gly	missense	Exon 1 of 12	NP_001153048.1
	SCNN1A	NM_001159575.2		c.310C>G	p.Arg104Gly	missense	Exon 2 of 13	NP_001153047.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCNN1A	ENST00000228916.7	TSL:1 MANE Select	c.241C>G	p.Arg81Gly	missense	Exon 2 of 13	ENSP00000228916.2
	SCNN1A	ENST00000360168.7	TSL:1	c.418C>G	p.Arg140Gly	missense	Exon 1 of 12	ENSP00000353292.3
	SCNN1A	ENST00000543768.1	TSL:2	c.310C>G	p.Arg104Gly	missense	Exon 2 of 13	ENSP00000438739.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461862 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727224

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53402

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111998

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.040
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.50	D
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Benign	0.74	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.76	D
MetaSVM	Uncertain	0.25	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		3.9
PrimateAI	Uncertain	0.54	T
PROVEAN	Pathogenic	-5.8	D
REVEL	Uncertain	0.42
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.51
MutPred		0.64		Loss of methylation at R81 (P = 0.0143)
MVP		0.87
MPC		0.63
ClinPred		0.99	D
GERP RS		4.9
PromoterAI		0.030	Neutral
Varity_R		0.66
gMVP		0.72
Mutation Taster		=14/86	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: rs61759860; hg19: chr12-6483709;