2-214945020-CG-C

Variant names:

• chr2-214945020-CG-C
• rs387906284
• NM_173076.3:c.7323delC

Variant summary

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

The NM_173076.3(ABCA12):​c.7323delC​(p.Val2442SerfsTer22) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000496 in 1,613,436 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: ABCA12 NM_173076.3 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: -5.46

Genes affected

ABCA12 (HGNC:14637): (ATP binding cassette subfamily A member 12) The membrane-associated 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 intracellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, and White). This encoded protein is a member of the ABC1 subfamily, which is the only major ABC subfamily found exclusively in multicellular eukaryotes. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Jul 2008]

SNHG31 (HGNC:54196): (small nucleolar RNA host gene 31)

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 2-214945020-CG-C is Pathogenic according to our data. Variant chr2-214945020-CG-C is described in ClinVar as [Pathogenic]. Clinvar id is 2859.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-214945020-CG-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCA12	NM_173076.3	c.7323delC	p.Val2442SerfsTer22	frameshift_variant	Exon 49 of 53	ENST00000272895.12	NP_775099.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCA12	ENST00000272895.12	c.7323delC	p.Val2442SerfsTer22	frameshift_variant	Exon 49 of 53	1	NM_173076.3	ENSP00000272895.7

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152034 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000159 AC: 4 AN: 250884 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135594

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000131

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461402 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 726988

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: 0.0000812

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152034 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74238

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Oct 28, 2022

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 29, 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.Val2442Serfs*22) in the ABCA12 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ABCA12 are known to be pathogenic (PMID: 20672373). ClinVar contains an entry for this variant (Variation ID: 2859). This variant is also known as 7541delC. This premature translational stop signal has been observed in individual(s) with autosomal recessive congenital ichthyosis (PMID: 15756637, 31168818). This variant is present in population databases (rs387906284, gnomAD 0.01%). For these reasons, this variant has been classified as Pathogenic. -

Jan 04, 2017

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.7323delC pathogenic variant in the ABCA12 gene, reported as c.7541delC, has been observed previously in the homozygous state in patients with harlequin ichthyosis (HI) (Kelsell et al., 2005). The deletion causes a frameshift starting with codon Valine 2442, changes this amino acid to a Serine residue and creates a premature Stop codon at position 22 of the new reading frame, denoted p.Val2442SerfsX22. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. -

Autosomal recessive congenital ichthyosis 4B;C1832550:Autosomal recessive congenital ichthyosis 4A Pathogenic:1

Jan 06, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Autosomal recessive congenital ichthyosis 4B Pathogenic:1

May 01, 2005

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

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

Other links and lift over

dbSNP: rs387906284; hg19: chr2-215809744;