NM_001023.4:c.306T>A

Variant names:

• chr8-56073144-A-T
• rs749176723
• NM_001023.4:c.306T>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001023.4(RPS20):​c.306T>A​(p.Thr102Thr) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. T102T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RPS20 NM_001023.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.458
• Publications: 0 publications found

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]

RPS20 Gene-Disease associations (from GenCC):

• Diamond-Blackfan anemia

  Inheritance: AD Classification: MODERATE, SUPPORTIVE, LIMITED Submitted by: PanelApp Australia, Orphanet, Ambry Genetics
• familial colorectal cancer

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• familial colorectal cancer type X

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary nonpolyposis colon cancer

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• Lynch syndrome

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.62).
• BP7: Synonymous conserved (PhyloP=0.458 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001023.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RPS20	NM_001023.4	MANE Select	c.306T>A	p.Thr102Thr	synonymous	Exon 4 of 4	NP_001014.1	P60866-1
	RPS20	NM_001146227.3		c.306T>A	p.Thr102Thr	synonymous	Exon 4 of 6	NP_001139699.1	P60866-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RPS20	ENST00000009589.8	TSL:1 MANE Select	c.306T>A	p.Thr102Thr	synonymous	Exon 4 of 4	ENSP00000009589.3	P60866-1
	RPS20	ENST00000524349.5	TSL:1	c.141T>A	p.Thr47Thr	synonymous	Exon 3 of 3	ENSP00000429049.1	G3XAN0
	RPS20	ENST00000519807.5	TSL:2	c.306T>A	p.Thr102Thr	synonymous	Exon 4 of 6	ENSP00000429374.1	P60866-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.62
CADD	Benign	4.2
DANN	Benign	0.75
PhyloP100		0.46

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

Other links and lift over

dbSNP: rs749176723; hg19: chr8-56985703;