NM_000085.5:c.1308C>A

Variant names:

• chr1-16051720-C-A
• rs5252
• NM_000085.5:c.1308C>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_000085.5(CLCNKB):​c.1308C>A​(p.Ile436Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. I436I) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLCNKB NM_000085.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.36
• Publications: 0 publications found

Genes affected

CLCNKB (HGNC:2027): (chloride voltage-gated channel Kb) The protein encoded by this gene is a member of the family of voltage-gated chloride channels. Chloride channels have several functions, including the regulation of cell volume, membrane potential stabilization, signal transduction and transepithelial transport. This gene is expressed predominantly in the kidney and may be important for renal salt reabsorption. Mutations in this gene are associated with autosomal recessive Bartter syndrome type 3 (BS3). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2009]

CLCNKB Gene-Disease associations (from GenCC):

• Bartter disease type 3

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• Bartter disease type 4B

  Inheritance: AR Classification: STRONG Submitted by: G2P
• Bartter syndrome type 4

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Gitelman syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.45).
• BP7: Synonymous conserved (PhyloP=-1.36 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000085.5. 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
	CLCNKB	NM_000085.5	MANE Select	c.1308C>A	p.Ile436Ile	synonymous	Exon 14 of 20	NP_000076.2
	CLCNKB	NM_001165945.2		c.801C>A	p.Ile267Ile	synonymous	Exon 7 of 13	NP_001159417.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CLCNKB	ENST00000375679.9	TSL:1 MANE Select	c.1308C>A	p.Ile436Ile	synonymous	Exon 14 of 20	ENSP00000364831.5
	CLCNKB	ENST00000682338.1		c.1308C>A	p.Ile436Ile	synonymous	Exon 16 of 22	ENSP00000507062.1
	CLCNKB	ENST00000682793.1		c.1308C>A	p.Ile436Ile	synonymous	Exon 14 of 20	ENSP00000506910.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 4839

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.45
CADD	Benign	0.36
DANN	Benign	0.76
PhyloP100		-1.4
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: rs5252; hg19: chr1-16378215;