20-63689115-G-T

Variant names:

• chr20-63689115-G-T
• rs398123052
• NM_001283009.2:c.1861G>T
• RTEL1 p.Ala621Ser

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_001283009.2(RTEL1):​c.1861G>T​(p.Ala621Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,457,496 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. A621T) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: RTEL1 NM_001283009.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.68
• Publications: 5 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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr20-63689115-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 65418.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.812

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001283009.2. 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
	RTEL1	NM_001283009.2	MANE Select	c.1861G>T	p.Ala621Ser	missense	Exon 22 of 35	NP_001269938.1	Q9NZ71-6
	RTEL1	NM_032957.5		c.1933G>T	p.Ala645Ser	missense	Exon 22 of 35	NP_116575.3	Q9NZ71-7
	RTEL1	NM_016434.4		c.1861G>T	p.Ala621Ser	missense	Exon 22 of 35	NP_057518.1	Q9NZ71-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RTEL1	ENST00000360203.11	TSL:5 MANE Select	c.1861G>T	p.Ala621Ser	missense	Exon 22 of 35	ENSP00000353332.5	Q9NZ71-6
	RTEL1	ENST00000508582.7	TSL:2	c.1933G>T	p.Ala645Ser	missense	Exon 22 of 35	ENSP00000424307.2	Q9NZ71-7
	RTEL1	ENST00000370018.7	TSL:1	c.1861G>T	p.Ala621Ser	missense	Exon 22 of 35	ENSP00000359035.3	Q9NZ71-1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000809 AC: 2 AN: 247316 AF XY: 0.00000743

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000545

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1457496 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 725296

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49270

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111860

Other (OTH) AF: 0.00 AC: 0 AN: 60346

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.50
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.82	D
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.71	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Benign	1.7	L
PhyloP100		6.7
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-2.6	D
REVEL	Uncertain	0.56
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0090	D
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.7
Varity_R		0.62
gMVP		0.77
Mutation Taster		=48/52	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs398123052;

hg19: chr20-62320468;