rs794729157

Positions:

• chr10-110821710-G-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_001134363.3(RBM20):​c.3091G>T​(p.Gly1031*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000143 in 1,399,446 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 Uncertain significance (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: RBM20 NM_001134363.3 stop_gained
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.06

Genes affected

RBM20 (HGNC:27424): (RNA binding motif protein 20) This gene encodes a protein that binds RNA and regulates splicing. Mutations in this gene have been associated with familial dilated cardiomyopathy. [provided by RefSeq, Apr 2014]

ACMG classification

Verdict is Pathogenic. Variant got 10 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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RBM20	NM_001134363.3	c.3091G>T	p.Gly1031*	stop_gained	11/14	ENST00000369519.4	NP_001127835.2
RBM20	XM_017016103.3	c.2926G>T	p.Gly976*	stop_gained	11/14		XP_016871592.1
RBM20	XM_017016104.3	c.2707G>T	p.Gly903*	stop_gained	11/14		XP_016871593.1
RBM20	XM_047425116.1	c.2707G>T	p.Gly903*	stop_gained	11/14		XP_047281072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RBM20	ENST00000369519.4	c.3091G>T	p.Gly1031*	stop_gained	11/14	1	NM_001134363.3	ENSP00000358532.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000143 AC: 2 AN: 1399446 Hom.: 0 Cov.: 33 AF XY: 0.00000145 AC XY: 1 AN XY: 690228

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: 9.27e-7

Gnomad4 OTH exome AF: 0.0000172

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Dilated cardiomyopathy 1DD Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 09, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. ClinVar contains an entry for this variant (Variation ID: 202074). This premature translational stop signal has been observed in individual(s) with dilated cardiomyopathy (PMID: 22004663). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change creates a premature translational stop signal (p.Gly1031*) in the RBM20 gene. It is expected to result in an absent or disrupted protein product. However, the current clinical and genetic evidence is not sufficient to establish whether loss-of-function variants in RBM20 cause disease. -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 16, 2024

The p.G1031* variant (also known as c.3091G>T), located in coding exon 11 of the RBM20 gene, results from a G to T substitution at nucleotide position 3091. This changes the amino acid from a glycine to a stop codon within coding exon 11. This alteration has been detected in a patient with dilated cardiomyopathy (DCM); however, clinical genetic testing was limited to the RBM20 gene in this DCM study cohort (Refaat MM et al. Heart Rhythm. 2012;9:390-6). This variant was also detected in the homozygous state as a consequence of uniparental disomy in an individual with aborted sudden cardiac death, reduced left ventricular ejection fraction, prolonged QTc interval, and left ventricular noncompaction whose heterozygous mother was unaffected (Murayama R. Sci Rep. 2018 06;8(1):8970). This alteration is expected to result in premature protein truncation or nonsense-mediated mRNA decay. However, loss of function of RBM20 has not been clearly established as a mechanism of disease. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	40
DANN	Uncertain	0.99
Eigen	Pathogenic	0.81
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Benign	0.60	D
Vest4		0.76
GERP RS		4.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.31		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.31		Position offset: -2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs794729157; hg19: chr10-112581468;