7-87472655-G-T

Variant names:

• chr7-87472655-G-T
• rs142794414
• NM_000443.4:c.101C>A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 5P and 4B. PM1 PM2 PP2 BP4_Strong

The NM_000443.4(ABCB4):​c.101C>A​(p.Thr34Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000275 in 1,456,108 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: ABCB4 NM_000443.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.199

Genes affected

ABCB4 (HGNC:45): (ATP binding cassette subfamily B member 4) The membrane-associated 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 MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance as well as antigen presentation. This gene encodes a full transporter and member of the p-glycoprotein family of membrane proteins with phosphatidylcholine as its substrate. The function of this protein has not yet been determined; however, it may involve transport of phospholipids from liver hepatocytes into bile. Alternative splicing of this gene results in several products of undetermined function. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM1: In a mutagenesis_site Does not inhibit efflux activity for PC. (size 0) in uniprot entity MDR3_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the ABCB4 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 6 curated benign missense variants. Gene score misZ: 1.9749 (below the threshold of 3.09). Trascript score misZ: 3.5425 (above the threshold of 3.09). GenCC associations: The gene is linked to pancreatitis, low phospholipid associated cholelithiasis, progressive familial intrahepatic cholestasis type 3.
• BP4: Computational evidence support a benign effect (MetaRNN=0.04464647).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCB4	NM_000443.4	c.101C>A	p.Thr34Lys	missense_variant	Exon 3 of 28	ENST00000649586.2	NP_000434.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCB4	ENST00000649586.2	c.101C>A	p.Thr34Lys	missense_variant	Exon 3 of 28		NM_000443.4	ENSP00000496956.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000798 AC: 2 AN: 250774 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135512

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000882

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.00000275 AC: 4 AN: 1456108 Hom.: 0 Cov.: 29 AF XY: 0.00000276 AC XY: 2 AN XY: 724858

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 9.03e-7

Gnomad4 OTH exome AF: 0.0000332

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	0.013
DANN	Benign	0.24
DEOGEN2	Benign	0.19	.;.;T;.;.;.
Eigen	Benign	-1.6
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.066	N
LIST_S2	Benign	0.27	.;T;T;T;.;T
M_CAP	Benign	0.050	D
MetaRNN	Benign	0.045	T;T;T;T;T;T
MetaSVM	Benign	-0.66	T
MutationAssessor	Benign	0.0	N;N;N;N;N;.
PrimateAI	Benign	0.41	T
PROVEAN	Benign	1.4	.;N;N;N;N;N
REVEL	Uncertain	0.34
Sift	Benign	1.0	.;T;T;T;T;T
Sift4G	Benign	0.99	.;T;T;T;T;T
Polyphen		0.0	B;.;B;B;.;.
Vest4		0.19, 0.23, 0.22, 0.18
MutPred		0.35		Gain of methylation at T34 (P = 0.0148);Gain of methylation at T34 (P = 0.0148);Gain of methylation at T34 (P = 0.0148);Gain of methylation at T34 (P = 0.0148);Gain of methylation at T34 (P = 0.0148);Gain of methylation at T34 (P = 0.0148);
MVP		0.34
MPC		0.33
ClinPred		0.0073	T
GERP RS		-8.7
Varity_R		0.044
gMVP		0.24

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

Publications

LitVar

Other links and lift over

dbSNP: rs142794414; hg19: chr7-87101971;