Genetic Variant ABCB8:p.Val146Leu (chr7-151034300-G-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_007188.5(ABCB8):c.436G>T(p.Val146Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,336 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V146I) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

ABCB8
NM_007188.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.53

Publications

0 publications found

Variant links:

Genes affected

ABCB8 (HGNC:49): (ATP binding cassette subfamily B member 8) This nuclear gene encodes a multi-pass membrane protein that is targeted to the mitochondrial inner membrane. The encoded protein is an ATP-dependent transporter that may mediate the passage of organic and inorganic molecules out of the mitochondria. Loss of function of the related gene in mouse results in a disruption of iron homeostasis between the mitochondria and cytosol. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2013]

ABCB8 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCB8	NM_007188.5 link	c.436G>T	p.Val146Leu	missense_variant	Exon 3 of 16	ENST00000358849.9	NP_009119.2	Q9NUT2-2
ABCB8	NM_001282291.2 link	c.487G>T	p.Val163Leu	missense_variant	Exon 4 of 17		NP_001269220.1	Q9NUT2-1
ABCB8	NM_001282292.2 link	c.436G>T	p.Val146Leu	missense_variant	Exon 3 of 16		NP_001269221.1	Q9NUT2-3
ABCB8	NM_001282293.2 link	c.172G>T	p.Val58Leu	missense_variant	Exon 2 of 15		NP_001269222.1	Q9NUT2-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCB8	ENST00000358849.9 link	c.436G>T	p.Val146Leu	missense_variant	Exon 3 of 16	1	NM_007188.5	ENSP00000351717.4		Q9NUT2-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461336

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726978

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52956

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111966

Other (OTH)

AF:

0.0000166

AC:

AN:

60380

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.63

BayesDel_addAF

Uncertain

0.015

BayesDel_noAF

Benign

-0.22

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.24

.;.;T;.;.;T

Eigen

Benign

-0.065

Eigen_PC

Benign

0.057

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.97

D;D;D;D;D;D

M_CAP

Uncertain

0.13

MetaRNN

Uncertain

0.51

D;D;D;D;D;D

MetaSVM

Benign

-0.28

MutationAssessor

Benign

0.73

.;.;N;.;.;.

PhyloP100

5.5

PrimateAI

Uncertain

0.64

PROVEAN

Benign

-1.5

N;N;N;N;N;N

REVEL

Benign

0.27

Sift

Benign

0.17

T;T;T;T;T;T

Sift4G

Benign

0.27

T;T;T;T;D;D

Polyphen

0.042, 0.36, 0.62

.;B;B;.;.;P

Vest4

0.60

MutPred

0.56

.;.;Gain of helix (P = 0.2294);.;.;.;

MVP

0.92

MPC

0.25

ClinPred

0.57

GERP RS

4.1

Varity_R

0.13

gMVP

0.42

Mutation Taster

=71/29

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over