chr2-168972025-C-G

Position:

• chr2-168972025-C-G

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PM5 PP3_Strong PP5_Moderate

The NM_003742.4(ABCB11):​c.1460G>C​(p.Arg487Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R487H) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ABCB11 NM_003742.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.42

Genes affected

ABCB11 (HGNC:42): (ATP binding cassette subfamily B member 11) 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. The protein encoded by this gene is the major canalicular bile salt export pump in man. Mutations in this gene cause a form of progressive familial intrahepatic cholestases which are a group of inherited disorders with severe cholestatic liver disease from early infancy. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-168972025-C-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.982
• PP5: Variant 2-168972025-C-G is Pathogenic according to our data. Variant chr2-168972025-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 1070887.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ABCB11	NM_003742.4	c.1460G>C	p.Arg487Pro	missense_variant	14/28	ENST00000650372.1	NP_003733.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ABCB11	ENST00000650372.1	c.1460G>C	p.Arg487Pro	missense_variant	14/28		NM_003742.4	ENSP00000497931	P1
ABCB11	ENST00000439188.1	c.8G>C	p.Arg3Pro	missense_variant, NMD_transcript_variant	1/15	2		ENSP00000416058

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 24, 2020

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 ABCB11 protein function. This variant disrupts the p.Arg487 amino acid residue in ABCB11. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 12717091, 27050426). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. This sequence change replaces arginine with proline at codon 487 of the ABCB11 protein (p.Arg487Pro). The arginine residue is highly conserved and there is a moderate physicochemical difference between arginine and proline. This variant is not present in population databases (ExAC no frequency). This variant has been observed in individual(s) with progressive familial intrahepatic cholestasis (PMID: 18395098,18937870). -

Progressive familial intrahepatic cholestasis type 2 Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Natera, Inc.

Aug 07, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D;D
Eigen	Uncertain	0.64
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	.;D
M_CAP	Pathogenic	0.38	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	0.84	D
MutationAssessor	Benign	1.7	L;L
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-5.3	D;.
REVEL	Pathogenic	0.79
Sift	Uncertain	0.0010	D;.
Sift4G	Uncertain	0.0040	D;.
Polyphen		1.0	D;D
Vest4		0.94
MutPred		0.90		Loss of catalytic residue at R487 (P = 0.1221);Loss of catalytic residue at R487 (P = 0.1221);
MVP		0.93
MPC		0.76
ClinPred		1.0	D
GERP RS		5.9
Varity_R		0.95
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.21		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.21		Position offset: -17

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-169828535;