rs863225129

Variant names:

• chr20-63687936-G-A
• rs863225129
• NM_001283009.2:c.1482-1G>A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1_Moderate PP5_Very_Strong

The NM_001283009.2(RTEL1):​c.1482-1G>A variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000685 in 1,460,204 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: RTEL1 NM_001283009.2 splice_acceptor, intron
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 6.67

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

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.0292083 fraction of the gene. Cryptic splice site detected, with MaxEntScore 6.1, offset of 11, new splice context is: cacgctcaaccctttcccAGtct. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.
• PP5: Variant 20-63687936-G-A is Pathogenic according to our data. Variant chr20-63687936-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 217518.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RTEL1	NM_001283009.2	c.1482-1G>A		splice_acceptor_variant, intron_variant	Intron 17 of 34	ENST00000360203.11	NP_001269938.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RTEL1	ENST00000360203.11	c.1482-1G>A		splice_acceptor_variant, intron_variant	Intron 17 of 34	5	NM_001283009.2	ENSP00000353332.5
RTEL1	ENST00000508582.7	c.1554-1G>A		splice_acceptor_variant, intron_variant	Intron 17 of 34	2		ENSP00000424307.2
RTEL1	ENST00000370018.7	c.1482-1G>A		splice_acceptor_variant, intron_variant	Intron 17 of 34	1		ENSP00000359035.3
RTEL1-TNFRSF6B	ENST00000492259.6	n.1566-1G>A		splice_acceptor_variant, intron_variant	Intron 15 of 34	5		ENSP00000457428.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000685 AC: 10 AN: 1460204 Hom.: 0 Cov.: 33 AF XY: 0.00000826 AC XY: 6 AN XY: 726394

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000899

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Interstitial lung disease 2 Pathogenic:1

May 19, 2015

University of Washington Center for Mendelian Genomics, University of Washington

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Dyskeratosis congenita, autosomal recessive 5;C4225346:Pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3 Pathogenic:1

Aug 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects an acceptor splice site in intron 17 of the RTEL1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in RTEL1 are known to be pathogenic (PMID: 23453664, 23959892, 25607374). This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individual(s) with pulmonary fibrosis (PMID: 25607374). ClinVar contains an entry for this variant (Variation ID: 217518). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Dyskeratosis congenita Pathogenic:1

Jun 16, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The RTEL1 c.1554-1G>A variant involves the alteration of a conserved intronic nucleotide located at the invariant AG acceptor splice site of intron 17. One in silico tool predicts a damaging outcome while 3/5 splice site tools predict the variant to result in the loss of the acceptor site in intron 17 and additionally, 5/5 tools predict an activation of a cryptic splice site in exon 18 by the variant. It is absent in 117242 control chromosomes and to our knowledge, it was only reported in a family with idiopathic interstitial pneumonia. The affected family members (father and a daughter) carried the variant in heterozygosity. Persons with DKC may develop IPF and it is conceivable that IPF in a young person could be the first manifestation of DKC; thus, DKC should be considered in young persons with IPF (GeneReviews). One clinical diagnostic laboratory has classified this variant as Pathogenic. Taken together, this variant is currently classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Uncertain	-0.040
CADD	Pathogenic	33
DANN	Uncertain	0.99
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Uncertain	0.91	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.87
SpliceAI score (max)		0.96		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.80		Position offset: 12
DS_AL_spliceai		0.96		Position offset: 1

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

Publications

LitVar

Other links and lift over

dbSNP: rs863225129; hg19: chr20-62319289; COSMIC: COSV58893789; COSMIC: COSV58893789;