4-113287683-G-T

Variant names:

• chr4-113287683-G-T
• rs1554422359
• NM_001148.6:c.2158G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001148.6(ANK2):​c.2158G>T​(p.Asp720Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,459,872 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. D720E) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ANK2 NM_001148.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.62
• Publications: 0 publications found

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]

ANK2 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: Ambry Genetics, ClinGen
• Brugada syndrome

  Inheritance: AD Classification: LIMITED, NO_KNOWN Submitted by: Genomics England PanelApp, ClinGen
• catecholaminergic polymorphic ventricular tachycardia

  Inheritance: AD Classification: LIMITED, NO_KNOWN Submitted by: ClinGen, Genomics England PanelApp
• heart conduction disease

  Inheritance: AD Classification: LIMITED Submitted by: Genomics England PanelApp
• neurodevelopmental disorder

  Inheritance: AD Classification: LIMITED Submitted by: G2P
• cardiac arrhythmia, ankyrin-B-related

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

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001148.6. 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
	ANK2	NM_001148.6	MANE Select	c.2158G>T	p.Asp720Tyr	missense	Exon 19 of 46	NP_001139.3
	ANK2	NM_001386174.1		c.2209G>T	p.Asp737Tyr	missense	Exon 19 of 51	NP_001373103.1
	ANK2	NM_001386175.1		c.2185G>T	p.Asp729Tyr	missense	Exon 18 of 50	NP_001373104.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ANK2	ENST00000357077.9	TSL:1 MANE Select	c.2158G>T	p.Asp720Tyr	missense	Exon 19 of 46	ENSP00000349588.4
	ANK2	ENST00000506344.6	TSL:1	c.2209G>T	p.Asp737Tyr	missense	Exon 19 of 51	ENSP00000422888.2
	ANK2	ENST00000394537.7	TSL:1	c.2158G>T	p.Asp720Tyr	missense	Exon 19 of 45	ENSP00000378044.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459872 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726444

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33420

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26110

East Asian (EAS) AF: 0.00 AC: 0 AN: 39690

South Asian (SAS) AF: 0.00 AC: 0 AN: 86208

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53300

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 9.01e-7 AC: 1 AN: 1110332

Other (OTH) AF: 0.00 AC: 0 AN: 60332

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Uncertain	0.060	T
BayesDel_noAF	Benign	-0.15
CADD	Uncertain	25
DANN	Benign	0.84
DEOGEN2	Uncertain	0.47	T
Eigen	Benign	0.12
Eigen_PC	Benign	0.0099
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.91	D
M_CAP	Uncertain	0.21	D
MetaRNN	Uncertain	0.52	D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Uncertain	2.5	M
PhyloP100		3.6
PrimateAI	Benign	0.45	T
PROVEAN	Uncertain	-3.0	D
REVEL	Uncertain	0.46
Sift	Uncertain	0.012	D
Sift4G	Uncertain	0.033	D
Polyphen		0.79	P
Vest4		0.42
MutPred		0.54		Loss of disorder (P = 0.0179)
MVP		0.85
MPC		1.6
ClinPred		0.91	D
GERP RS		3.5
Varity_R		0.30
gMVP		0.42
Mutation Taster		=64/36	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: rs1554422359; hg19: chr4-114208839;