rs193929366

chr11-17461774-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Moderate PP5_Moderate

The NM_000352.6(ABCC8):c.631C>A(p.Gln211Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ABCC8 NM_000352.6 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 10.0

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_000352.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.848
• PP5: Variant 11-17461774-G-T is Pathogenic according to our data. Variant chr11-17461774-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 21169.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCC8	NM_000352.6	c.631C>A	p.Gln211Lys	missense_variant	5/39	ENST00000389817.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABCC8	ENST00000389817.8	c.631C>A	p.Gln211Lys	missense_variant	5/39	1	NM_000352.6	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Sep 12, 2023

This sequence change replaces glutamine, which is neutral and polar, with lysine, which is basic and polar, at codon 211 of the ABCC8 protein (p.Gln211Lys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant permanent neonatal diabetes (PMID: 17668386, 22815030; Invitae). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 21169). 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 ABCC8 protein function. For these reasons, this variant has been classified as Pathogenic. -

Permanent neonatal diabetes mellitus Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
Cadd	Uncertain	24
Dann	Uncertain	0.99
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;.;D;D;D;D;D;D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.85	D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.46	D
MutationTaster	Benign	1.0	A;A
PrimateAI	Pathogenic	0.87	D
Polyphen		0.22	.;.;B;.;.;.;.;.
Vest4		0.85, 0.86
MutPred		0.79		Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);Gain of ubiquitination at Q211 (P = 0.0121);
MVP		0.88
MPC		0.34
ClinPred		0.62	D
GERP RS		5.5
Varity_R		0.49
gMVP		0.72

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

LitVar

Other links and lift over

dbSNP: rs193929366; hg19: chr11-17483321;