8-56069854-GAAAA-GAAAAA

Variant names:

• chr8-56069854-G-GA
• rs762983865
• NM_001146227.3:c.334-22dupT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_001146227.3(RPS20):​c.334-22dupT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000288 in 1,318,246 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000032 (0 hom.)
• Consequence: RPS20 NM_001146227.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.554
• 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: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001146227.3. 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_001146227.3		c.334-22dupT		intron	N/A	NP_001139699.1	P60866-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RPS20	ENST00000519807.5	TSL:2	c.334-22dupT		intron	N/A	ENSP00000429374.1	P60866-2
	RPS20	ENST00000618656.2	TSL:3	c.316-22dupT		intron	N/A	ENSP00000478703.2	A0A7P0S5H5
	RPS20	ENST00000676918.1		n.*3235dupT		non_coding_transcript_exon	Exon 4 of 5	ENSP00000503327.1	P60866-1

Frequencies

GnomAD3 genomes AF: 0.00000659 AC: 1 AN: 151830 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000657

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000132 AC: 2 AN: 151642 AF XY: 0.0000248

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 FIN exome AF: 0.0000685

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000317 AC: 37 AN: 1166416 Hom.: 0 Cov.: 15 AF XY: 0.0000290 AC XY: 17 AN XY: 585720

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000741 AC: 2 AN: 27008

American (AMR) AF: 0.00 AC: 0 AN: 35232

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23678

East Asian (EAS) AF: 0.00 AC: 0 AN: 34688

South Asian (SAS) AF: 0.0000806 AC: 6 AN: 74468

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48736

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5222

European-Non Finnish (NFE) AF: 0.0000323 AC: 28 AN: 867136

Other (OTH) AF: 0.0000199 AC: 1 AN: 50248

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.00000659 AC: 1 AN: 151830 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74130

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 41304

American (AMR) AF: 0.0000657 AC: 1 AN: 15232

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5174

South Asian (SAS) AF: 0.00 AC: 0 AN: 4818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10548

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67966

Other (OTH) AF: 0.00 AC: 0 AN: 2090

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.55
Mutation Taster		=100/0	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs762983865; hg19: chr8-56982413;