2-219210752-G-A

Position:

chr2-219210752-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PP3_ModerateBS1_SupportingBS2

The NM_005689.4(ABCB6):c.2215C>T(p.Arg739Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000324 in 1,613,730 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R739H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00030 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00033 ( 2 hom. )

Consequence

ABCB6
NM_005689.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 4.09

Variant links:

Genes affected

ABCB6 (HGNC:47): (ATP binding cassette subfamily B member 6 (LAN blood group)) This gene encodes a member of the ATP-binding cassette (ABC) transporter superfamily. ABC proteins transport various molecules across extra- and intra-cellular membranes. This protein is a member of the heavy metal importer subfamily and plays a role in porphyrin transport. This gene is the molecular basis of the Langereis (Lan) blood group antigen and mutations in this gene underlie familial pseudohyperkalemia and dyschromatosis universalis hereditaria. [provided by RefSeq, Mar 2017]

ABCB6 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.842

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000296 (45/152236) while in subpopulation AMR AF= 0.000654 (10/15300). AF 95% confidence interval is 0.000354. There are 0 homozygotes in gnomad4. There are 15 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 45 AD,BG gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCB6	NM_005689.4 linkuse as main transcript	c.2215C>T	p.Arg739Cys	missense_variant	16/19	ENST00000265316.9
ABCB6	NM_001349828.2 linkuse as main transcript	c.2077C>T	p.Arg693Cys	missense_variant	15/18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABCB6	ENST00000265316.9 linkuse as main transcript	c.2215C>T	p.Arg739Cys	missense_variant	16/19	1	NM_005689.4	P1	Q9NP58-1

Frequencies

GnomAD3 genomes

AF:

0.000296

AC:

AN:

152116

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00637

Gnomad NFE

AF:

0.000382

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000424

AC:

105

AN:

247698

Hom.:

AF XY:

0.000380

AC XY:

AN XY:

134336

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00107

Gnomad ASJ exome

AF:

0.000804

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000442

Gnomad OTH exome

AF:

0.00165

GnomAD4 exome

AF:

0.000327

AC:

478

AN:

1461494

Hom.:

Cov.:

AF XY:

0.000336

AC XY:

244

AN XY:

727012

show subpopulations

Gnomad4 AFR exome

AF:

0.000239

Gnomad4 AMR exome

AF:

0.00107

Gnomad4 ASJ exome

AF:

0.000612

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000310

Gnomad4 OTH exome

AF:

0.000696

GnomAD4 genome

AF:

0.000296

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.000202

AC XY:

AN XY:

74430

show subpopulations

Gnomad4 AFR

AF:

0.000144

Gnomad4 AMR

AF:

0.000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000382

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000343

Hom.:

Bravo

AF:

0.000408

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000354

AC:

EpiCase

AF:

0.000436

EpiControl

AF:

0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Mar 23, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 16, 2023	This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 739 of the ABCB6 protein (p.Arg739Cys). This variant is present in population databases (rs141840760, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with ABCB6-related conditions. ClinVar contains an entry for this variant (Variation ID: 993667). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Microphthalmia, isolated, with coloboma 7

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Dr. Zeinali's Medical Genetics Lab, Kawsar Human Genetics Research Center

Mar 12, 2024

- -

ABCB6-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

May 11, 2023

The ABCB6 c.2215C>T variant is predicted to result in the amino acid substitution p.Arg739Cys. This variant has been reported along with two variants in the SPTA1 gene in an individual with an erythrocyte disorder (Andolfo et al. 2021. PubMed ID: 34201899). This variant is reported in 0.11% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/2-220075474-G-A), which may be too common to be a primary cause of disease. Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.78

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.52

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.90

D;.

Eigen

Pathogenic

0.83

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Uncertain

0.80

LIST_S2

Pathogenic

1.0

D;D

M_CAP

Pathogenic

0.54

MetaRNN

Pathogenic

0.84

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.7

H;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.78

PROVEAN

Pathogenic

-7.6

D;.

REVEL

Pathogenic

0.90

Sift

Pathogenic

0.0

D;.

Sift4G

Pathogenic

0.0

D;.

Polyphen

1.0

D;D

Vest4

0.94

MVP

0.95

MPC

0.95

ClinPred

0.50

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.98

gMVP

0.91

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

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