chr11-128838528-G-A

Variant names:

• chr11-128838528-G-A
• rs117189807
• NM_153766.3:c.*597C>T

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The NM_153766.3(KCNJ1):​c.*597C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0154 in 154,068 control chromosomes in the GnomAD database, including 26 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.015 (26 hom., cov: 32)
  • Exomes 𝑓: 0.017 (0 hom.)
• Consequence: KCNJ1 NM_153766.3 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: -1.46
• Publications: 2 publications found

Genes affected

KCNJ1 (HGNC:6255): (potassium inwardly rectifying channel subfamily J member 1) Potassium channels are present in most mammalian cells, where they participate in a wide range of physiologic responses. The protein encoded by this gene is an integral membrane protein and inward-rectifier type potassium channel. It is activated by internal ATP and probably plays an important role in potassium homeostasis. The encoded protein has a greater tendency to allow potassium to flow into a cell rather than out of a cell. Mutations in this gene have been associated with antenatal Bartter syndrome, which is characterized by salt wasting, hypokalemic alkalosis, hypercalciuria, and low blood pressure. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

KCNJ1 Gene-Disease associations (from GenCC):

• Bartter disease type 2

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• antenatal Bartter syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0153 (2338/152322) while in subpopulation NFE AF = 0.0227 (1543/68028). AF 95% confidence interval is 0.0217. There are 26 homozygotes in GnomAd4. There are 1078 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAd4 at 26 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNJ1	NM_153766.3	c.*597C>T		3_prime_UTR_variant	Exon 3 of 3	ENST00000392666.6	NP_722450.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNJ1	ENST00000392666.6	c.*597C>T		3_prime_UTR_variant	Exon 3 of 3	1	NM_153766.3	ENSP00000376434.1

Frequencies

GnomAD3 genomes AF: 0.0154 AC: 2340 AN: 152204 Hom.: 26 Cov.: 32

Gnomad AFR AF: 0.00540

Gnomad AMI AF: 0.00548

Gnomad AMR AF: 0.0200

Gnomad ASJ AF: 0.0170

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00290

Gnomad FIN AF: 0.0116

Gnomad MID AF: 0.0633

Gnomad NFE AF: 0.0227

Gnomad OTH AF: 0.0224

GnomAD4 exome AF: 0.0172 AC: 30 AN: 1746 Hom.: 0 Cov.: 0 AF XY: 0.0170 AC XY: 17 AN XY: 1000

African (AFR) AF: 0.00 AC: 0 AN: 6

American (AMR) AF: 0.00926 AC: 2 AN: 216

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 4

East Asian (EAS) AF: 0.00 AC: 0 AN: 28

South Asian (SAS) AF: 0.00 AC: 0 AN: 100

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 12

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AF: 0.0196 AC: 26 AN: 1326

Other (OTH) AF: 0.0370 AC: 2 AN: 54

GnomAD4 genome AF: 0.0153 AC: 2338 AN: 152322 Hom.: 26 Cov.: 32 AF XY: 0.0145 AC XY: 1078 AN XY: 74480

African (AFR) AF: 0.00541 AC: 225 AN: 41572

American (AMR) AF: 0.0199 AC: 305 AN: 15304

Ashkenazi Jewish (ASJ) AF: 0.0170 AC: 59 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00290 AC: 14 AN: 4824

European-Finnish (FIN) AF: 0.0116 AC: 123 AN: 10612

Middle Eastern (MID) AF: 0.0578 AC: 17 AN: 294

European-Non Finnish (NFE) AF: 0.0227 AC: 1543 AN: 68028

Other (OTH) AF: 0.0222 AC: 47 AN: 2116

Alfa AF: 0.0179 Hom.: 36

Bravo AF: 0.0155

Asia WGS AF: 0.00318 AC: 11 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Antenatal Bartter syndrome Uncertain:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.19
DANN	Benign	0.32
PhyloP100		-1.5
Mutation Taster		=100/0	polymorphism

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: rs117189807; hg19: chr11-128708423;