20-63693211-C-G

Variant names:

• chr20-63693211-C-G
• rs398123017
• NM_001283009.2:c.2920C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001283009.2(RTEL1):​c.2920C>G​(p.Arg974Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,459,954 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R974Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: RTEL1 NM_001283009.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.632
• Publications: 16 publications found

Genes affected

RTEL1 (HGNC:15888): (regulator of telomere elongation helicase 1) This gene encodes a DNA helicase which functions in the stability, protection and elongation of telomeres and interacts with proteins in the shelterin complex known to protect telomeres during DNA replication. Mutations in this gene have been associated with dyskeratosis congenita and Hoyerall-Hreidarsson syndrome. Read-through transcription of this gene into the neighboring downstream gene, which encodes tumor necrosis factor receptor superfamily, member 6b, generates a non-coding transcript. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Sep 2013]

RTEL1-TNFRSF6B (HGNC:44095): (RTEL1-TNFRSF6B readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring RTEL1 (regulator of telomere elongation helicase 1) and TNFRSF6B (tumor necrosis factor receptor superfamily, member 6b, decoy) genes on chromosome 20. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is unlikely to produce a protein product. [provided by RefSeq, Feb 2011]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17438442).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RTEL1	NM_001283009.2	c.2920C>G	p.Arg974Gly	missense_variant	Exon 30 of 35	ENST00000360203.11	NP_001269938.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RTEL1	ENST00000360203.11	c.2920C>G	p.Arg974Gly	missense_variant	Exon 30 of 35	5	NM_001283009.2	ENSP00000353332.5
RTEL1	ENST00000508582.7	c.2992C>G	p.Arg998Gly	missense_variant	Exon 30 of 35	2		ENSP00000424307.2
RTEL1	ENST00000370018.7	c.2920C>G	p.Arg974Gly	missense_variant	Exon 30 of 35	1		ENSP00000359035.3
RTEL1-TNFRSF6B	ENST00000492259.6	n.*522C>G		non_coding_transcript_exon_variant	Exon 27 of 35	5		ENSP00000457428.1
RTEL1-TNFRSF6B	ENST00000492259.6	n.*522C>G		3_prime_UTR_variant	Exon 27 of 35	5		ENSP00000457428.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000401 AC: 1 AN: 249302 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1459954 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 726288

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44690

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26106

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52072

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111560

Other (OTH) AF: 0.0000166 AC: 1 AN: 60334

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	15
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.52	D;.;.;.
Eigen	Benign	-0.38
Eigen_PC	Benign	-0.43
FATHMM_MKL	Benign	0.23	N
LIST_S2	Uncertain	0.87	D;D;D;T
M_CAP	Benign	0.045	D
MetaRNN	Benign	0.17	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.5	L;.;L;.
PhyloP100		0.63
PrimateAI	Benign	0.22	T
PROVEAN	Uncertain	-2.9	D;D;D;.
REVEL	Benign	0.17
Sift	Benign	0.051	T;D;D;.
Sift4G	Benign	0.16	T;T;T;T
Polyphen		0.0030	B;B;B;.
Vest4		0.30
MutPred		0.39		Gain of sheet (P = 0.0477);.;Gain of sheet (P = 0.0477);.;
MVP		0.26
ClinPred		0.71	D
GERP RS		4.8
Varity_R		0.15
gMVP		0.36
Mutation Taster		=91/9	polymorphism

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

Other links and lift over

dbSNP: rs398123017; hg19: chr20-62324564;