rs141965666

Positions:

• chr4-113288495-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001148.6(ANK2):​c.2277+9C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00274 in 1,609,100 control chromosomes in the GnomAD database, including 11 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0028 (11 hom.)
• Consequence: ANK2 NM_001148.6 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:10
• Conservation: PhyloP100: -0.566

Genes affected

ANK2 (HGNC:493): (ankyrin 2) This gene encodes a member of the ankyrin family of proteins that link the integral membrane proteins to the underlying spectrin-actin cytoskeleton. Ankyrins play key roles in activities such as cell motility, activation, proliferation, contact and the maintenance of specialized membrane domains. Most ankyrins are typically composed of three structural domains: an amino-terminal domain containing multiple ankyrin repeats; a central region with a highly conserved spectrin binding domain; and a carboxy-terminal regulatory domain which is the least conserved and subject to variation. The protein encoded by this gene is required for targeting and stability of Na/Ca exchanger 1 in cardiomyocytes. Mutations in this gene cause long QT syndrome 4 and cardiac arrhythmia syndrome. Multiple transcript variants encoding different isoforms have been described. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BP6: Variant 4-113288495-C-T is Benign according to our data. Variant chr4-113288495-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 238571.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr4-113288495-C-T is described in Lovd as [Benign]. Variant chr4-113288495-C-T is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.00281 (4098/1456852) while in subpopulation MID AF= 0.016 (92/5764). AF 95% confidence interval is 0.0133. There are 11 homozygotes in gnomad4_exome. There are 2005 alleles in male gnomad4_exome subpopulation. Median coverage is 30. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 310 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ANK2	NM_001148.6	c.2277+9C>T		intron_variant		ENST00000357077.9	NP_001139.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ANK2	ENST00000357077.9	c.2277+9C>T		intron_variant		1	NM_001148.6	ENSP00000349588	A2

Frequencies

GnomAD3 genomes AF: 0.00205 AC: 312 AN: 152130 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000604

Gnomad AMI AF: 0.0197

Gnomad AMR AF: 0.000393

Gnomad ASJ AF: 0.00317

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000621

Gnomad FIN AF: 0.00189

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.00329

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.00253 AC: 636 AN: 251028 Hom.: 1 AF XY: 0.00259 AC XY: 351 AN XY: 135692

Gnomad AFR exome AF: 0.000431

Gnomad AMR exome AF: 0.000550

Gnomad ASJ exome AF: 0.00268

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00101

Gnomad FIN exome AF: 0.00256

Gnomad NFE exome AF: 0.00417

Gnomad OTH exome AF: 0.00375

GnomAD4 exome AF: 0.00281 AC: 4098 AN: 1456852 Hom.: 11 Cov.: 30 AF XY: 0.00277 AC XY: 2005 AN XY: 725052

Gnomad4 AFR exome AF: 0.000629

Gnomad4 AMR exome AF: 0.000604

Gnomad4 ASJ exome AF: 0.00211

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00117

Gnomad4 FIN exome AF: 0.00231

Gnomad4 NFE exome AF: 0.00319

Gnomad4 OTH exome AF: 0.00241

GnomAD4 genome AF: 0.00204 AC: 310 AN: 152248 Hom.: 0 Cov.: 32 AF XY: 0.00161 AC XY: 120 AN XY: 74422

Gnomad4 AFR AF: 0.000578

Gnomad4 AMR AF: 0.000392

Gnomad4 ASJ AF: 0.00317

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000622

Gnomad4 FIN AF: 0.00189

Gnomad4 NFE AF: 0.00328

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00232 Hom.: 0

Bravo AF: 0.00184

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:10

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Aug 10, 2017	Variant summary: The ANK2 c.2277+9C>T variant involves the alteration of a non-conserved intronic nucleotide. MutationTaster predicts a benign outcome for this variant. 5/5 splice prediction tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. This variant was found in the large control database ExAC at a frequency of 0.0030006 (359/119642 control chromosomes [2 homozygotes]), which is approximately 300 times the estimated maximal expected allele frequency of a pathogenic ANK2 variant (0.00001), strongly suggesting this variant is likely a benign polymorphism. In ClinVar, one clinical diagnostic laboratory classified this variant as benign (Invitae), while another classified this variant as uncertain significance (Illumina). The variant of interest has not, to our knowledge, been reported in affected individuals via publications, nor evaluated for functional impact by in vivo/vitro studies. Taken together, this variant is classified as benign. -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -

Cardiac arrhythmia, ankyrin-B-related Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	Jul 28, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Dec 05, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

not specified Benign:2

Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -

ANK2-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jul 23, 2019

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Long QT syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	5.0
DANN	Benign	0.49

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: rs141965666; hg19: chr4-114209651;