rs1554933565

Variant names:

• chr11-17443296-ATC-A
• rs1554933565
• NM_000352.6:c.1347_1348delGA

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000352.6(ABCC8):​c.1347_1348delGA​(p.Ile450SerfsTer44) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ABCC8 NM_000352.6 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 O:2
• Conservation: PhyloP100: 3.50

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-17443296-ATC-A is Pathogenic according to our data. Variant chr11-17443296-ATC-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 558438.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	c.1347_1348delGA	p.Ile450SerfsTer44	frameshift_variant	Exon 9 of 39	ENST00000389817.8	NP_000343.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCC8	ENST00000389817.8	c.1347_1348delGA	p.Ile450SerfsTer44	frameshift_variant	Exon 9 of 39	1	NM_000352.6	ENSP00000374467.4

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Other:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Jul 07, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Ile450Serfs*44) in the ABCC8 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ABCC8 are known to be pathogenic (PMID: 20685672, 23345197). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 558438). This premature translational stop signal has been observed in individual(s) with ABCC8-related conditions (PMID: 16429405). This variant is not present in population databases (gnomAD no frequency). -

Aug 07, 2020

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change is a two base pair deletion in exon 9, c.1347_1348del. This sequence change results in an amino acid frameshift and creates a premature stop codon 43 amino acids downstream of the change, p.Ile450Serfs*44. This sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated ABCC8 protein with potentially abnormal function. This sequence change is absent from the large population databases such as ExAC and gnomAD. This sequence change has previously been described in a Diazoxide-responsive patient with CHI (PMID: 16429405). -

Hyperinsulinemic hypoglycemia, familial, 1 Pathogenic:1

May 22, 2018

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Neonatal diabetes mellitus Other:1

May 27, 2024

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

Significance: Uncertain risk allele

Review Status: flagged submission

Collection Method: research

This variant is found to be a potent moderate impact, variant with a sufficient scientific evidence of gene-disease correlation. However, since this is not a high impact variant and no variant evidence, this variant is reclassified as Uncertain risk allele. -

Maturity onset diabetes mellitus in young Other:1

May 27, 2024

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

Significance: Uncertain risk allele

Review Status: flagged submission

Collection Method: research

This variant is found to be a potent moderate impact variant with a sufficient scientific evidence to support gene-disease correlation. However, since this is not a high impact variant and has no variant evidence, this variant is reclassified as Uncertain Risk Allele -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1554933565; hg19: chr11-17464843;