NM_000352.6:c.563A>G

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2PP3_ModeratePP5_Very_Strong

The NM_000352.6(ABCC8):c.563A>G(p.Asn188Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000275 in 1,453,258 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: not found (cov: 33)

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

ABCC8
NM_000352.6 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:11

Conservation

PhyloP100: 8.02

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:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

PP5

Variant 11-17463454-T-C is Pathogenic according to our data. Variant chr11-17463454-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 210082.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCC8	NM_000352.6 link	c.563A>G	p.Asn188Ser	missense_variant	Exon 4 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.563A>G	p.Asn188Ser	missense_variant	Exon 4 of 39	1	NM_000352.6	ENSP00000374467.4		Q09428-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000275

AC:

AN:

1453258

Hom.:

Cov.:

AF XY:

0.00000277

AC XY:

AN XY:

721706

show subpopulations

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:

0.00000271

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:11

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hyperinsulinemic hypoglycemia, familial, 1

Pathogenic:5

Jul 17, 2023

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0103 - Loss of function and gain of function are known mechanisms of disease in this gene and are associated with congenital hyperinsulism (CHI) and neonatal diabetes mellitus (NDM), respectively (PMIDs: 32376986, 32027066). (I) 0108 - This gene is known to be associated with both recessive and dominant disease. The ABCC8 gene has been associated with both autosomal recessive and dominant NDM and CHI (PMID: 32027066). Focal CHI is caused by a somatic second hit with the loss of the maternal chromosome 11p15.5 region by uniparental disomy that makes the paternally inherited variant mosaic homozygous (PMID: 32027066). (I) 0112 - The condition associated with this gene has incomplete penetrance. Variable penetrance has been reported for hyperinsulinemic hypoglycaemia, familial, 1 (MIM#256450) (PMID: 20301549). (I) 0200 - Variant is predicted to result in a missense amino acid change from asparagine to serine. (I) 0251 - This variant is heterozygous. (I) 0301 - Variant is absent from gnomAD (both v2 and v3). (SP) 0502 - Missense variant with conflicting in silico predictions and uninformative conservation. (I) 0600 - Variant is located in the annotated TMD0 domain (PMID: 25639667). (I) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported multiple times as likely pathogenic and pathogenic, and have been observed in both homozygous and compound heterozygous individuals with hyperinsulinism (ClinVar, PMID: 25639667, PMID: 25972930, PMID: 15562009, PMID: 24686051). (SP) 1205 - This variant has been shown to be maternally inherited (by trio analysis). (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Jun 16, 2015

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 03, 2019

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ABCC8 c.563A>G (p.Asn188Ser) 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 was absent in 235752 control chromosomes (gnomAD). c.563A>G has been reported in the literature in multiple individuals affected with Congenital or Familial Hyperinsulinism (Shyng_1998, Nestorowicz_1998, Christesen_2001, Del Roio Liberatore_2015). These data indicate that the variant is very likely to be associated with disease. A functional study, Shyng_2008, found the variant to form channels that were indistinguishable from the wild-type in terms of regulation of the channel by nucleotides and diazoxide. However, the authors do indicate the variant could be playing a role in transcription, translation, trafficking or stability of protein, where were not assessed. Three ClinVar submissions from clinical diagnostic laboratories (evaluation after 2014) cites the variant as likely pathogenic/pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Dec 27, 2023

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Predicted Consequence/Location: Missense variant In silico tool predictions suggest damaging effect of the variant on gene or gene product [3Cnet: 0.96 (>=0.6, sensitivity 0.72 and precision 0.9)]. Same nucleotide change resulting in same amino acid change has been previously reported as pathogenic/likely pathogenic with strong evidence (ClinVar ID: VCV000210082 /PMID: 9618169).The variant has been reported to be in trans with a pathogenic variant as either compound heterozygous or homozygous in at least 2 similarly affected unrelated individuals (PMID: 15562009, 24686051, 28442472, 9618169). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Aug 23, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Pathogenic:2

Sep 18, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 188 of the ABCC8 protein (p.Asn188Ser). For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on ABCC8 function (PMID: 9648840). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ABCC8 protein function. ClinVar contains an entry for this variant (Variation ID: 210082). This missense change has been observed in individual(s) with autosomal recessive diffuse or focal hyperinsulinism (PMID: 15562009, 16429405, 24434300, 24686051, 28442472). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is not present in population databases (gnomAD no frequency). -

Jun 16, 2017

Athena Diagnostics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Type 2 diabetes mellitus

Pathogenic:1

Mar 26, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary hyperinsulinism

Pathogenic:1

Jan 04, 2021

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Type 2 diabetes mellitus;C0271714:Leucine-induced hypoglycemia;C1835887:Diabetes mellitus, transient neonatal, 2;C2931832:Hyperinsulinemic hypoglycemia, familial, 1;C5394303:Diabetes mellitus, permanent neonatal 3

Pathogenic:1

Mar 25, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Diabetes mellitus, permanent neonatal 3

Pathogenic:1

May 08, 2023

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

-0.060

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.50

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

Eigen

Uncertain

0.22

Eigen_PC

Uncertain

0.28

FATHMM_MKL

Uncertain

0.86

LIST_S2

Uncertain

0.97

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

M_CAP

Uncertain

0.10

MetaRNN

Pathogenic

0.81

D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.61

MutationAssessor

Uncertain

2.3

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

PrimateAI

Uncertain

0.69

PROVEAN

Uncertain

-2.5

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

REVEL

Uncertain

0.53

Sift

Benign

0.051

.;.;T;D;.;.;.;.

Sift4G

Benign

0.14

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

Polyphen

0.62

.;.;P;.;.;.;.;.

Vest4

0.94, 0.94

MutPred

0.80

Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);

MVP

0.91

MPC

0.26

ClinPred

0.91

GERP RS

3.8

Varity_R

0.24

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.97

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.97

Position offset: 5

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