chr11-17474926-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_000352.6(ABCC8):c.250G>A(p.Val84Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000192 in 1,614,062 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

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

Exomes 𝑓: 0.000020 ( 0 hom. )

Consequence

ABCC8
NM_000352.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:5

Conservation

PhyloP100: 3.36

Variant links:

Genes affected

ABCC8 (HGNC:59): (ATP binding cassette subfamily C member 8) The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MRP subfamily which is involved in multi-drug resistance. This protein functions as a modulator of ATP-sensitive potassium channels and insulin release. Mutations in the ABCC8 gene and deficiencies in the encoded protein have been observed in patients with hyperinsulinemic hypoglycemia of infancy, an autosomal recessive disorder of unregulated and high insulin secretion. Mutations have also been associated with non-insulin-dependent diabetes mellitus type II, an autosomal dominant disease of defective insulin secretion. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jul 2020]

ABCC8 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.3049888).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCC8	NM_000352.6 link	c.250G>A	p.Val84Ile	missense_variant	Exon 2 of 39	ENST00000389817.8	NP_000343.2	Q09428-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCC8	ENST00000389817.8 link	c.250G>A	p.Val84Ile	missense_variant	Exon 2 of 39	1	NM_000352.6	ENSP00000374467.4		Q09428-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251430

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135918

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000198

AC:

AN:

1461888

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000252

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000989

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152174

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000942

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000478

Hom.:

Bravo

AF:

0.0000189

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hyperinsulinemic hypoglycemia, familial, 1

Uncertain:2

Nov 14, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 06, 2021

New York Genome Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Monogenic diabetes

Pathogenic:1

Mar 09, 2022

Biomedical Genomics and Oncogenetics Laboratory, Institut Pasteur de Tunis, University Tunis El Manar

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

not specified

Uncertain:1

Jun 12, 2023

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ABCC8 c.250G>A (p.Val84Ile) results in a conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 2e-05 in 251430 control chromosomes. c.250G>A has been reported in the literature in multiple individuals from a single three generation family affected with Monogenic Diabetes presenting as familial mild hyperglycemia (example, Gonsorcikova_2011) and continues to be cited by others (example, Li_2022, Aarthy_2021, Koufakis_2019, Tatsi_2020, Piptapolkai_2020). To our knowledge, no reports of its presence in individuals affected with Congenital Hyperinsulinism/Familial Hyperinsulinism and no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 32763092, 21214702, 31110826, 34631896, 32376986, 31604004). Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. All laboratories classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as a variant of uncertain significance (VUS) for Autosomal Recessive Familial Hyperinsulism and a VUS-possibly pathogenic for Monogenic Diabetes. -

ABCC8-related disorder

Uncertain:1

Jul 19, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The ABCC8 c.250G>A variant is predicted to result in the amino acid substitution p.Val84Ile. This variant has been reported in the heterozygous state to segregate with hyperglycemia in multiple individuals from a three-generation family (Gonsorcikova et al. 2011. PubMed ID: 21214702). This variant was also documented in an intrahepatic cholestasis of pregnancy (ICP) cohort (Table S3, Liu et al. 2022. PubMed ID: 36046230). This variant is reported in 0.010% of alleles in individuals of East Asian descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

not provided

Uncertain:1

Aug 20, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 84 of the ABCC8 protein (p.Val84Ile). This variant is present in population databases (rs775776658, gnomAD 0.01%). This missense change has been observed in individual(s) with familial mild hyperglycemia (PMID: 21214702). ClinVar contains an entry for this variant (Variation ID: 554707). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.085

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Pathogenic

0.16

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.37

.;.;T;.;.;.;.;.

Eigen

Benign

0.10

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.88

D;.;D;D;D;D;D;D

M_CAP

Uncertain

0.10

MetaRNN

Benign

0.30

T;T;T;T;T;T;T;T

MetaSVM

Uncertain

0.66

MutationAssessor

Uncertain

2.4

.;M;M;M;.;.;.;.

PrimateAI

Uncertain

0.66

PROVEAN

Benign

-0.47

.;.;N;N;.;.;.;.

REVEL

Uncertain

0.55

Sift

Benign

0.21

.;.;T;T;.;.;.;.

Sift4G

Benign

0.38

.;.;T;T;.;.;.;.

Polyphen

0.36

.;.;B;.;.;.;.;.

Vest4

0.13, 0.13

MutPred

0.34

Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);

MVP

0.90

MPC

0.31

ClinPred

0.42

GERP RS

5.2

Varity_R

0.10

gMVP

0.68

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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