chr12-56043400-CTG-C

Position:

• chr12-56043400-CTG-C

Variant summary

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

The NM_001029.5(RPS26):​c.224_225del​(p.Val75GlufsTer15) variant causes a frameshift change involving the alteration of a 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: 31)
• Consequence: RPS26 NM_001029.5 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.66

Genes affected

RPS26 (HGNC:10414): (ribosomal protein S26) This gene encodes a ribosomal protein that is a component of the 40S subunit. The protein belongs to the S26E family of ribosomal proteins. Mutations in this gene are found in Diamond-Blackfan anemia 10. There are multiple processed pseudogenes of this gene dispersed through the genome. [provided by RefSeq, Aug 2017]

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 12-56043400-CTG-C is Pathogenic according to our data. Variant chr12-56043400-CTG-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 470476.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RPS26	NM_001029.5	c.224_225del	p.Val75GlufsTer15	frameshift_variant	3/4	ENST00000646449.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RPS26	ENST00000646449.2	c.224_225del	p.Val75GlufsTer15	frameshift_variant	3/4		NM_001029.5	P1
RPS26	ENST00000356464.10	c.224_225del	p.Val75GlufsTer15	frameshift_variant	4/5	1		P1
RPS26	ENST00000552361.1	c.224_225del	p.Val75GlufsTer15	frameshift_variant	4/5	5		P1
RPS26	ENST00000548590.1	n.1011_1012del		non_coding_transcript_exon_variant	2/3	5

Frequencies

GnomAD3 genomes Cov.: 31

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

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Diamond-Blackfan anemia 10 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Centre for Mendelian Genomics, University Medical Centre Ljubljana	Nov 20, 2018	This variant was classified as: Pathogenic. The following ACMG criteria were applied in classifying this variant: PVS1,PM2. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 18, 2023	This sequence change creates a premature translational stop signal (p.Val75Glufs*15) in the RPS26 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 41 amino acid(s) of the RPS26 protein. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with RPS26-related conditions. ClinVar contains an entry for this variant (Variation ID: 470476). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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

Other links and lift over

dbSNP: rs1555208596; hg19: chr12-56437184;