12-21845821-C-T

Position:

• chr12-21845821-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_020297.4(ABCC9):​c.2878G>A​(p.Glu960Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. E960Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ABCC9 NM_020297.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.45

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ABCC9. . Gene score misZ 4.9694 (greater than the threshold 3.09). Trascript score misZ 7.023 (greater than threshold 3.09). GenCC has associacion of gene with 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCC9	NM_020297.4	c.2878G>A	p.Glu960Lys	missense_variant	26/40	ENST00000261200.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABCC9	ENST00000261200.9	c.2878G>A	p.Glu960Lys	missense_variant	26/40	5	NM_020297.4	P4
	ENST00000539874.1	n.331+14627C>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.36	.;.;T
Eigen	Benign	0.14
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.97	D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.69	D;D;D
MetaSVM	Uncertain	0.22	D
MutationAssessor	Uncertain	2.5	M;.;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-2.1	N;N;N
REVEL	Uncertain	0.54
Sift	Benign	0.065	T;T;T
Sift4G	Benign	0.12	T;T;T
Polyphen		0.096	B;.;B
Vest4		0.50
MutPred		0.43		Gain of ubiquitination at E960 (P = 0.0077);.;Gain of ubiquitination at E960 (P = 0.0077);
MVP		0.77
MPC		1.6
ClinPred		0.98	D
GERP RS		5.3
Varity_R		0.31
gMVP		0.65

Splicing

Name	Calibrated prediction	Score	Prediction
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: rs1025600293; hg19: chr12-21998755; COSMIC: COSV53967191;