16-16182887-C-G

Variant names:

• chr16-16182887-C-G
• rs72653780
• NM_001171.6:c.1987G>C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP3_Strong

The NM_001171.6(ABCC6):​c.1987G>C​(p.Gly663Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G663C) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ABCC6 NM_001171.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.90

Genes affected

ABCC6 (HGNC:57): (ATP binding cassette subfamily C member 6) 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). The encoded protein, a member of the MRP subfamily, is involved in multi-drug resistance. Mutations in this gene cause pseudoxanthoma elasticum. Alternatively spliced transcript variants that encode different proteins have been described for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a domain ABC transporter 1 (size 224) in uniprot entity MRP6_HUMAN there are 31 pathogenic changes around while only 5 benign (86%) in NM_001171.6
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr16-16182887-C-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.996

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCC6	NM_001171.6	c.1987G>C	p.Gly663Arg	missense_variant	Exon 16 of 31	ENST00000205557.12	NP_001162.5
ABCC6	NM_001351800.1	c.1645G>C	p.Gly549Arg	missense_variant	Exon 16 of 31		NP_001338729.1
ABCC6	NR_147784.1	n.2024G>C		non_coding_transcript_exon_variant	Exon 16 of 29

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCC6	ENST00000205557.12	c.1987G>C	p.Gly663Arg	missense_variant	Exon 16 of 31	1	NM_001171.6	ENSP00000205557.7
ABCC6	ENST00000456970.6	n.1987G>C		non_coding_transcript_exon_variant	Exon 16 of 29	2		ENSP00000405002.2
ABCC6	ENST00000622290.5	n.1987G>C		non_coding_transcript_exon_variant	Exon 16 of 32	5		ENSP00000483331.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jun 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 663 of the ABCC6 protein (p.Gly663Arg). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with ABCC6-related conditions. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt ABCC6 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	28
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.94	D;.
Eigen	Pathogenic	0.83
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Pathogenic	0.61	D
MetaRNN	Pathogenic	1.0	D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Pathogenic	4.8	H;H
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-7.3	D;.
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.99
MutPred		0.96		Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);
MVP		0.89
MPC		0.44
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.95
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs72653780; hg19: chr16-16276744;