NM_001374385.1:c.1982T>C

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PP2PP3_ModeratePP5_Very_Strong

The NM_001374385.1(ATP8B1):c.1982T>C(p.Ile661Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000159 in 1,613,520 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

ATP8B1
NM_001374385.1 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:15O:1

Conservation

PhyloP100: 9.32

Variant links:

Genes affected

ATP8B1 (HGNC:3706): (ATPase phospholipid transporting 8B1) This gene encodes a member of the P-type cation transport ATPase family, which belongs to the subfamily of aminophospholipid-transporting ATPases. The aminophospholipid translocases transport phosphatidylserine and phosphatidylethanolamine from one side of a bilayer to another. Mutations in this gene may result in progressive familial intrahepatic cholestasis type 1 and in benign recurrent intrahepatic cholestasis. [provided by RefSeq, Jul 2008]

ATP8B1 links:

ENSG00000267787 (HGNC:):

ENSG00000267787 links:

ATP8B1-AS1 (HGNC:56042): (ATP8B1 antisense RNA 1)

ATP8B1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PP2

Missense variant in the ATP8B1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 21 curated pathogenic missense variants (we use a threshold of 10). The gene has 24 curated benign missense variants. Trascript score misZ: 3.3227 (above the threshold of 3.09). GenCC associations: The gene is linked to progressive familial intrahepatic cholestasis type 1, cholestasis, intrahepatic, of pregnancy, 1.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.922

PP5

Variant 18-57669433-A-G is Pathogenic according to our data. Variant chr18-57669433-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 7267.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-57669433-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATP8B1	NM_001374385.1 link	c.1982T>C	p.Ile661Thr	missense_variant	Exon 18 of 28	ENST00000648908.2	NP_001361314.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATP8B1	ENST00000648908.2 link	c.1982T>C	p.Ile661Thr	missense_variant	Exon 18 of 28		NM_001374385.1	ENSP00000497896.1		O43520

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152130

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000206

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000956

AC:

AN:

251022

Hom.:

AF XY:

0.000111

AC XY:

AN XY:

135726

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000167

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000166

AC:

242

AN:

1461390

Hom.:

Cov.:

AF XY:

0.000176

AC XY:

128

AN XY:

727018

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000375

Gnomad4 NFE exome

AF:

0.000206

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.0000986

AC:

AN:

152130

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000206

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000162

Hom.:

Bravo

AF:

0.000102

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000906

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:15Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:6

Feb 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 661 of the ATP8B1 protein (p.Ile661Thr). This variant is present in population databases (rs121909100, gnomAD 0.02%). This missense change has been observed in individuals with benign recurrent intrahepatic cholestasis and/or progressive familial intrahepatic cholestasis (PMID: 9500542, 9918928, 15239083, 20232290, 33666275, 34016879). ClinVar contains an entry for this variant (Variation ID: 7267). 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 not expected to disrupt ATP8B1 protein function with a negative predictive value of 80%. Experimental studies have shown that this missense change affects ATP8B1 function (PMID: 19731236, 19918981). For these reasons, this variant has been classified as Pathogenic. -

Jul 03, 2019

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 03, 2016

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Progressive familial intrahepatic cholestasis type 1

Pathogenic:3Other:1

Jul 01, 2004

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

At least 1 copy of this variant is found in most persons of European descent -

Jun 19, 2023

Mendelics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 16, 2018

Illumina Laboratory Services, Illumina

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Across a selection of available literature, the ATP8B1 c.1982T>C (p.Ile661Thr) variant has been reported in a homozygous state in 25 probands, in a compound heterozygous state in eight probands and in a heterozygous state in nine probands (Bull et al. 1998; Tygstrup et al. 1999; Klomp et al. 2004). The clinical presentation of many probands with this variant were described as having benign recurrent intrahepatic cholestatis, but some were described to have progressive disease. This disease has been noted to have reduced penetrance, and five individuals homozygous for the p.Ile661Thr variant were asymptomatic (Klomp et al. 2004). The p.Ile661Thr variant was absent from 289 controls and is reported at a frequency of 0.000158 in the European (non-Finnish) population of the Genome Aggregation Database. Functional studies to determine the effect of the p.Ile661Thr variant in cell lines document overall reduced protein expression compared to wild type (Folmer et al. 2009). Further investigation revealed the p.Ile661Thr variant to result in protein misfolding which was rescued by chemical chaperones such as 4-BPA (van der Velden et al. 2010; van der Woerd et al. 2016). Based on the collective evidence, the p.Ile661Thr variant is classified as pathogenic for familial intrahepatic cholestasis. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Benign recurrent intrahepatic cholestasis type 1

Pathogenic:3

Mar 24, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jul 01, 2004

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

May 13, 2022

MGZ Medical Genetics Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

ATP8B1-related disorder

Pathogenic:1

Feb 13, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The ATP8B1 c.1982T>C variant is predicted to result in the amino acid substitution p.Ile661Thr. This variant has been reported to be one of the most common causative variants responsible for benign recurrent intrahepatic cholestasis (Bull et al. 1998. PubMed ID: 9500542; Folmer et al. 2009. PubMed ID: 19731236; van der Velden et al. 2010. PubMed ID: 19918981). This variant is reported in 0.016% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpreted as pathogenic. -

Progressive familial intrahepatic cholestasis

Pathogenic:1

Feb 04, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ATP8B1 c.1982T>C (p.Ile661Thr) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 9.6e-05 in 251022 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in ATP8B1 causing Familial Intrahepatic Cholestasis (9.6e-05 vs 0.0022), allowing no conclusion about variant significance. c.1982T>C has been reported in the literature as a homozygous or compound heterozygous genotype in multiple individuals affected with Familial Intrahepatic Cholestasis (example, PMID: 19731236, 15239083, 9918928, 33666275). These data indicate that the variant is very likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function (example, PMID: 19731236). The most pronounced variant effect results in decreased protein stability/overall reduced protein expression compared to wild type. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation (Pathogenic, n=4). Based on the evidence outlined above, the variant was classified as pathogenic. -

Cholestasis, intrahepatic, of pregnancy, 1;C4551898:Progressive familial intrahepatic cholestasis type 1;C4551899:Benign recurrent intrahepatic cholestasis type 1

Pathogenic:1

May 14, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.48

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.37

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.50

D;D

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.95

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.89

.;D

M_CAP

Uncertain

0.28

MetaRNN

Pathogenic

0.92

D;D

MetaSVM

Pathogenic

0.79

MutationAssessor

Pathogenic

3.4

M;M

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-3.2

D;.

REVEL

Pathogenic

0.92

Sift

Uncertain

0.0020

D;.

Sift4G

Uncertain

0.0030

D;.

Polyphen

1.0

D;D

Vest4

0.90

MVP

0.94

ClinPred

0.73

GERP RS

5.8

Varity_R

0.54

gMVP

0.92

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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