4-113278566-C-G

Position:

• chr4-113278566-C-G

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.1881+8C>G variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000971 in 1,613,060 control chromosomes in the GnomAD database, including 12 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0057 (7 hom., cov: 32)
  • Exomes 𝑓: 0.00048 (5 hom.)
• Consequence: ANK2 NM_001148.6 splice_region, intron
• Scores: Splicing: ADA: 0.0001745
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 0.569

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=-0.67).
• BP6: Variant 4-113278566-C-G is Benign according to our data. Variant chr4-113278566-C-G is described in ClinVar as [Benign]. Clinvar id is 347309.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00566 (862/152178) while in subpopulation AFR AF= 0.0197 (818/41516). AF 95% confidence interval is 0.0186. There are 7 homozygotes in gnomad4. There are 417 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 862 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ANK2	NM_001148.6	c.1881+8C>G		splice_region_variant, intron_variant		ENST00000357077.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ANK2	ENST00000357077.9	c.1881+8C>G		splice_region_variant, intron_variant		1	NM_001148.6	A2

Frequencies

GnomAD3 genomes AF: 0.00567 AC: 862 AN: 152060 Hom.: 7 Cov.: 32

Gnomad AFR AF: 0.0198

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00203

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00574

GnomAD3 exomes AF: 0.00139 AC: 350 AN: 251282 Hom.: 3 AF XY: 0.00104 AC XY: 141 AN XY: 135820

Gnomad AFR exome AF: 0.0198

Gnomad AMR exome AF: 0.000723

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.000490

GnomAD4 exome AF: 0.000483 AC: 705 AN: 1460882 Hom.: 5 Cov.: 30 AF XY: 0.000403 AC XY: 293 AN XY: 726800

Gnomad4 AFR exome AF: 0.0177

Gnomad4 AMR exome AF: 0.000827

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000900

Gnomad4 OTH exome AF: 0.00109

GnomAD4 genome AF: 0.00566 AC: 862 AN: 152178 Hom.: 7 Cov.: 32 AF XY: 0.00560 AC XY: 417 AN XY: 74398

Gnomad4 AFR AF: 0.0197

Gnomad4 AMR AF: 0.00203

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00568

Alfa AF: 0.00143 Hom.: 0

Bravo AF: 0.00613

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jan 05, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 05, 2018	Variant summary: ANK2 c.1881+8C>G alters a non-conserved intronic nucleotide in intron 17 of the ANK2 gene. 5/5 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be functionally assessed. The variant allele was found at a frequency of 0.0018 in 277002 control chromosomes in the gnomAD database, including 4 homozygotes. The observed variant frequency is approximately 183-folds higher than the estimated maximal expected allele frequency for a pathogenic variant in ANK2 causing Arrhythmia phenotype (1e-05), strongly suggesting that the variant is benign. To our knowledge, the variant, c.1881+8C>G, has not been reported in affected individuals via publications. Multiple clinical diagnostic laboratories have ClinVar submissions (after 2014) with classifications of "likely benign/benign." Based on the evidence outlined above, the variant was classified as benign. -

Cardiac arrhythmia, ankyrin-B-related Benign:2

Benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Dec 05, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Mar 03, 2015

- -

Long QT syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.67
CADD	Benign	7.4
DANN	Benign	0.79

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00017
dbscSNV1_RF	Benign	0.012
SpliceAI score (max)		0.010		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: rs74976371; hg19: chr4-114199722;