12-20815742-G-A

Position:

• chr12-20815742-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_019844.4(SLCO1B3):​c.4G>A​(p.Asp2Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000141 in 1,422,388 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SLCO1B3 NM_019844.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.77

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-SLCO1B7 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.21166629).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLCO1B3	NM_019844.4	c.4G>A	p.Asp2Asn	missense_variant	3/16	ENST00000381545.8	NP_062818.1
SLCO1B3-SLCO1B7	NM_001371097.1	c.4G>A	p.Asp2Asn	missense_variant	1/16		NP_001358026.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLCO1B3	ENST00000381545.8	c.4G>A	p.Asp2Asn	missense_variant	3/16	2	NM_019844.4	ENSP00000370956	P1
SLCO1B3	ENST00000261196.6	c.4G>A	p.Asp2Asn	missense_variant	1/14	1		ENSP00000261196	P1
SLCO1B3	ENST00000540853.5	c.4G>A	p.Asp2Asn	missense_variant	2/8	1		ENSP00000442000

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000141 AC: 2 AN: 1422388 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 708142

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: 0.00

Gnomad4 NFE exome AF: 0.00000185

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 11, 2023

The c.4G>A (p.D2N) alteration is located in exon 2 (coding exon 1) of the SLCO1B3 gene. This alteration results from a G to A substitution at nucleotide position 4, causing the aspartic acid (D) at amino acid position 2 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.092
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.15	.;T;T;.;.
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.27
FATHMM_MKL	Benign	0.53	D
LIST_S2	Benign	0.56	T;.;T;T;T
M_CAP	Benign	0.0097	T
MetaRNN	Benign	0.21	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.1	.;M;M;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-1.8	N;N;N;N;N
REVEL	Benign	0.073
Sift	Benign	0.21	T;T;T;T;T
Sift4G	Benign	0.30	T;T;T;T;T
Polyphen		0.31	.;B;B;.;.
Vest4		0.20, 0.20, 0.26, 0.35
MutPred		0.29		Gain of MoRF binding (P = 0.0884);Gain of MoRF binding (P = 0.0884);Gain of MoRF binding (P = 0.0884);Gain of MoRF binding (P = 0.0884);Gain of MoRF binding (P = 0.0884);
MVP		0.43
MPC		0.012, 0.023
ClinPred		0.84	D
GERP RS		2.1
Varity_R		0.058
gMVP		0.35

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: rs763219424; hg19: chr12-20968676; COSMIC: COSV99681252;