12-20855143-G-GT

Position:

chr12-20855143-G-GT

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1PM2

The NM_019844.4(SLCO1B3):c.203dup(p.Leu68PhefsTer3) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000995 in 1,608,482 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

SLCO1B3
NM_019844.4 frameshift

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -1.53

Variant links:

Genes affected

SLCO1B3 (HGNC:10961): (solute carrier organic anion transporter family member 1B3) This gene encodes a liver-specific member of the organic anion transporter family. The encoded protein is a transmembrane receptor that mediates the sodium-independent uptake of endogenous and xenobiotic compounds and plays a critical role in bile acid and bilirubin transport. Mutations in this gene are a cause of Rotor type hyperbilirubinemia. Alternative splicing of this gene and the use of alternative promoters results in transcript variants encoding different isoforms that differ in their tissue specificity. [provided by RefSeq, Mar 2017]

SLCO1B3 links:

SLCO1B3-SLCO1B7 (HGNC:):

SLCO1B3-SLCO1B7 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 10 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
SLCO1B3	NM_019844.4 linkuse as main transcript	c.203dup	p.Leu68PhefsTer3	frameshift_variant	4/16	ENST00000381545.8	NP_062818.1
SLCO1B3-SLCO1B7	NM_001371097.1 linkuse as main transcript	c.203dup	p.Leu68PhefsTer3	frameshift_variant	2/16		NP_001358026.1
SLCO1B3	NM_001349920.2 linkuse as main transcript	c.119dup	p.Leu40PhefsTer3	frameshift_variant	2/14		NP_001336849.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLCO1B3	ENST00000381545.8 linkuse as main transcript	c.203dup	p.Leu68PhefsTer3	frameshift_variant	4/16	2	NM_019844.4	ENSP00000370956	P1	Q9NPD5-1
SLCO1B3	ENST00000261196.6 linkuse as main transcript	c.203dup	p.Leu68PhefsTer3	frameshift_variant	2/14	1		ENSP00000261196	P1	Q9NPD5-1
SLCO1B3	ENST00000540853.5 linkuse as main transcript	c.203dup	p.Leu68PhefsTer3	frameshift_variant	3/8	1		ENSP00000442000
SLCO1B3	ENST00000545880.1 linkuse as main transcript	n.55dup		non_coding_transcript_exon_variant	1/4	5

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151930

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000814

AC:

AN:

245810

Hom.:

AF XY:

0.00000752

AC XY:

AN XY:

132896

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000203

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000961

AC:

AN:

1456552

Hom.:

Cov.:

AF XY:

0.00000966

AC XY:

AN XY:

724620

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.000385

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000498

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151930

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74178

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Rotor syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Oct 02, 2018

The SLCO1B1 c.203dupT (p.Leu68PhefsTer3) variant results in a frameshift, and is predicted to cause an elongation of the protein. A literature search was performed for the gene, cDNA change, and amino acid change. No publications were found based on this search. The variant is reported at a frequency of 0.000208 in the Ashkenazi Jewish population from the Genome Aggregation Database, however this is based on two alleles so the variant is presumed to be rare. Based on the variant frequency, disease prevalence, disease penetrance, and inheritance mode, this variant could not be ruled out of causing disease. Due to the potential impact of frameshift variants and the lack of clarifying evidence, this variant is classified as a variant of unknown significance but suspicious for pathogenicity for Rotor syndrome. Note: bi-allelic variants in both the SLCO1B1 and SLCO1B3 genes combined have been shown to cause Rotor syndrome. For an individual to be affected with Rotor syndrome, they must carry a pathogenic variant in both copies of the SLCO1B1 gene and in both copies of the SLCO1B3 gene. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over