12-21840544-G-C

Variant names:

• chr12-21840544-G-C
• rs704178
• NM_020297.4:c.3473+1770C>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_020297.4(ABCC9):​c.3473+1770C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.547 in 152,004 control chromosomes in the GnomAD database, including 23,546 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.55 (23546 hom., cov: 33)
• Consequence: ABCC9 NM_020297.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.196
• Publications: 17 publications found

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]

ABCC9 Gene-Disease associations (from GenCC):

• hypertrichotic osteochondrodysplasia Cantu type

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• dilated cardiomyopathy 1O

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: Illumina, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• intellectual disability and myopathy syndrome

  Inheritance: AR Classification: MODERATE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• acromegaloid facial appearance syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hypertrichosis-acromegaloid facial appearance syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Brugada syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Genomics England PanelApp
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• atrial fibrillation, familial, 12

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000257022 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.655 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCC9	NM_020297.4	c.3473+1770C>G		intron_variant	Intron 29 of 39	ENST00000261200.9	NP_064693.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCC9	ENST00000261200.9	c.3473+1770C>G		intron_variant	Intron 29 of 39	5	NM_020297.4	ENSP00000261200.4

Frequencies

GnomAD3 genomes AF: 0.547 AC: 83146 AN: 151886 Hom.: 23528 Cov.: 33

Gnomad AFR AF: 0.662

Gnomad AMI AF: 0.588

Gnomad AMR AF: 0.632

Gnomad ASJ AF: 0.472

Gnomad EAS AF: 0.590

Gnomad SAS AF: 0.392

Gnomad FIN AF: 0.415

Gnomad MID AF: 0.481

Gnomad NFE AF: 0.491

Gnomad OTH AF: 0.543

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.547 AC: 83206 AN: 152004 Hom.: 23546 Cov.: 33 AF XY: 0.543 AC XY: 40345 AN XY: 74266

African (AFR) AF: 0.662 AC: 27425 AN: 41452

American (AMR) AF: 0.633 AC: 9669 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.472 AC: 1637 AN: 3468

East Asian (EAS) AF: 0.590 AC: 3049 AN: 5168

South Asian (SAS) AF: 0.392 AC: 1891 AN: 4824

European-Finnish (FIN) AF: 0.415 AC: 4369 AN: 10524

Middle Eastern (MID) AF: 0.469 AC: 138 AN: 294

European-Non Finnish (NFE) AF: 0.491 AC: 33352 AN: 67978

Other (OTH) AF: 0.540 AC: 1140 AN: 2110

Alfa AF: 0.363 Hom.: 877

Bravo AF: 0.571

Asia WGS AF: 0.508 AC: 1766 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	3.0
DANN	Benign	0.69
PhyloP100		-0.20
Mutation Taster		=100/0	polymorphism (auto)

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: rs704178; hg19: chr12-21993478;