8-56069748-C-G

Variant names:

• chr8-56069748-C-G
• rs1809701844
• NM_001146227.3:c.419G>C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001146227.3(RPS20):​c.419G>C​(p.Cys140Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/16 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C140R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RPS20 NM_001146227.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0650

Genes affected

RPS20 (HGNC:10405): (ribosomal protein S20) Ribosomes, the organelles that catalyze protein synthesis, consist of a small 40S subunit and a large 60S subunit. Together these subunits are composed of 4 RNA species and approximately 80 structurally distinct proteins. This gene encodes a ribosomal protein that is a component of the 40S subunit. The protein belongs to the S10P family of ribosomal proteins. It is located in the cytoplasm. This gene is co-transcribed with the small nucleolar RNA gene U54, which is located in its second intron. As is typical for genes encoding ribosomal proteins, there are multiple processed pseudogenes of this gene dispersed through the genome. Two transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Apr 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.064445585).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RPS20	NM_001146227.3	c.419G>C	p.Cys140Ser	missense_variant	Exon 5 of 6		NP_001139699.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RPS20	ENST00000519807.5	c.419G>C	p.Cys140Ser	missense_variant	Exon 5 of 6	2		ENSP00000429374.1
RPS20	ENST00000618656.2	c.401G>C	p.Cys134Ser	missense_variant	Exon 4 of 5	3		ENSP00000478703.2
RPS20	ENST00000676918.1	n.*3342G>C		non_coding_transcript_exon_variant	Exon 4 of 5			ENSP00000503327.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Feb 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

RPS20: PM2, BP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	1.0
DANN	Benign	0.61
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.040	N
LIST_S2	Benign	0.31	.;T
M_CAP	Benign	0.0022	T
MetaRNN	Benign	0.064	T;T
MetaSVM	Benign	-1.0	T
PrimateAI	Benign	0.36	T
PROVEAN	Benign	0.18	N;.
REVEL	Benign	0.023
Sift	Pathogenic	0.0	D;.
Vest4		0.20
MutPred		0.11		Gain of glycosylation at C140 (P = 0.0192);Gain of glycosylation at C140 (P = 0.0192);
MVP		0.043
MPC		1.5
ClinPred		0.071	T
GERP RS		1.0
gMVP		0.54

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1809701844; hg19: chr8-56982307;