NM_020297.4:c.1887G>T

Variant names:

• chr12-21887850-C-A
• rs150036969
• NM_020297.4:c.1887G>T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 1P and 7B. PP2 BP4_Moderate BP6 BS1

The NM_020297.4(ABCC9):​c.1887G>T​(p.Glu629Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000443 in 1,613,174 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00031 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00046 (0 hom.)
• Consequence: ABCC9 NM_020297.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:10
• Conservation: PhyloP100: 0.136

Genes affected

ABCC9 (HGNC:60): (ATP binding cassette subfamily C member 9) The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MRP subfamily which is involved in multi-drug resistance. This protein is thought to form ATP-sensitive potassium channels in cardiac, skeletal, and vascular and non-vascular smooth muscle. Protein structure suggests a role as the drug-binding channel-modulating subunit of the extra-pancreatic ATP-sensitive potassium channels. Mutations in this gene are associated with cardiomyopathy dilated type 1O. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2011]

ENSG00000257022 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• PP2: Missense variant in the ABCC9 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 32 curated pathogenic missense variants (we use a threshold of 10). The gene has 23 curated benign missense variants. Gene score misZ: 4.9694 (above the threshold of 3.09). Trascript score misZ: 7.023 (above the threshold of 3.09). GenCC associations: The gene is linked to hypertrichotic osteochondrodysplasia Cantu type, dilated cardiomyopathy, acromegaloid facial appearance syndrome, Brugada syndrome, atrial fibrillation, familial, 12, intellectual disability and myopathy syndrome, dilated cardiomyopathy 1O, familial isolated dilated cardiomyopathy, hypertrichosis-acromegaloid facial appearance syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.08369848).
• BP6: Variant 12-21887850-C-A is Benign according to our data. Variant chr12-21887850-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 45392.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=6, Uncertain_significance=5}. Variant chr12-21887850-C-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000309 (47/152282) while in subpopulation AMR AF= 0.000589 (9/15274). AF 95% confidence interval is 0.000379. There are 0 homozygotes in gnomad4. There are 28 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCC9	NM_020297.4	c.1887G>T	p.Glu629Asp	missense_variant	Exon 15 of 40	ENST00000261200.9	NP_064693.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCC9	ENST00000261200.9	c.1887G>T	p.Glu629Asp	missense_variant	Exon 15 of 40	5	NM_020297.4	ENSP00000261200.4

Frequencies

GnomAD3 genomes AF: 0.000309 AC: 47 AN: 152164 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000590

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: 0.000515

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000199 AC: 50 AN: 250774 Hom.: 0 AF XY: 0.000170 AC XY: 23 AN XY: 135548

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.000174

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: 0.000362

Gnomad OTH exome AF: 0.000327

GnomAD4 exome AF: 0.000457 AC: 668 AN: 1460892 Hom.: 0 Cov.: 30 AF XY: 0.000465 AC XY: 338 AN XY: 726784

Gnomad4 AFR exome AF: 0.000150

Gnomad4 AMR exome AF: 0.000157

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000577

Gnomad4 OTH exome AF: 0.000248

GnomAD4 genome AF: 0.000309 AC: 47 AN: 152282 Hom.: 0 Cov.: 32 AF XY: 0.000376 AC XY: 28 AN XY: 74462

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.000589

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000515

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000465 Hom.: 0

Bravo AF: 0.000336

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.00105 AC: 9

ExAC AF: 0.000148 AC: 18

EpiCase AF: 0.000382

EpiControl AF: 0.000296

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:10

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:6

-

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Clinical Genetics, Academic Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jun 24, 2013

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: research

- -

Feb 11, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 23861362) -

Jun 26, 2024

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP2 -

Dilated cardiomyopathy 1O Uncertain:1 Benign:1

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified Uncertain:1 Benign:1

Aug 25, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Glu629Asp variant in ABCC9 has been identified by our laboratory in 1 Cauc asian individual with probable ARVC. This variant has also been identified in 17 /66508 of European chromosomes by the Exome Aggregation Consortium (ExAC, http:/ /exac.broadinstitute.org; dbSNP rs150036969). Computational prediction tools and conservation analysis do not provide strong support for or against an impact to the protein. In summary, the clinical significance of the p.Glu629Asp variant i s uncertain. -

Jan 30, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ABCC9 c.1887G>T (p.Glu629Asp) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0002 in 250774 control chromosomes, predominantly at a frequency of 0.00036 within the Non-Finnish European subpopulation in the gnomAD database. The observed variant frequency within Non-Finnish European control individuals in the gnomAD database is approximately 23-fold of the estimated maximal expected allele frequency for a pathogenic variant in ABCC9 causing Dilated Cardiomyopathy phenotype (1.6e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Non-Finnish European origin. c.1887G>T has been reported in the literature in an individual affected with sudden arrhythmic death syndrome who also carried another variant of uncertain significance in FLNC (Nunn_2016). This report does not provide unequivocal conclusions about association of the variant with Dilated Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Six submitters have provided clinical-significance assessments for this variant to ClinVar after 2014, and classified is as uncertain significance (n=3) or likely benign (n=3). Based on the evidence outlined above, the variant was classified as likely benign. -

Hypertrichotic osteochondrodysplasia Cantu type Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Cardiomyopathy Uncertain:1

Nov 20, 2015

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Conduction disorder of the heart Benign:1

-

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype Benign:1

Mar 19, 2019

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.077
BayesDel_addAF	Benign	-0.081	T
BayesDel_noAF	Uncertain	-0.020
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.29	.;.;T
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.26
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.82	T;T;T
M_CAP	Benign	0.055	D
MetaRNN	Benign	0.084	T;T;T
MetaSVM	Benign	-0.41	T
MutationAssessor	Benign	1.4	L;.;L
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-0.79	N;N;N
REVEL	Uncertain	0.53
Sift	Benign	0.47	T;T;T
Sift4G	Benign	0.43	T;T;T
Polyphen		0.096	B;.;B
Vest4		0.24
MutPred		0.21		Gain of sheet (P = 0.0125);.;Gain of sheet (P = 0.0125);
MVP		0.86
MPC		0.61
ClinPred		0.029	T
GERP RS		3.2
Varity_R		0.081
gMVP		0.50

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.18		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: rs150036969; hg19: chr12-22040784;