chr20-63690161-GCCATGTCAT-G

Variant names:

• chr20-63690161-GCCATGTCAT-G
• rs863225053
• NM_001283009.2:c.2219_2227delATGTCATCC

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2 PM4 PP5_Very_Strong

The NM_001283009.2(RTEL1):​c.2219_2227delATGTCATCC​(p.His740_Ile742del) variant causes a disruptive inframe deletion change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: RTEL1 NM_001283009.2 disruptive_inframe_deletion
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 5.99

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 12 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_001283009.2.
• PP5: Variant 20-63690161-GCCATGTCAT-G is Pathogenic according to our data. Variant chr20-63690161-GCCATGTCAT-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 217283.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.2219_2227delATGTCATCC	p.His740_Ile742del	disruptive_inframe_deletion	Exon 25 of 35	ENST00000360203.11	NP_001269938.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RTEL1	ENST00000360203.11	c.2219_2227delATGTCATCC	p.His740_Ile742del	disruptive_inframe_deletion	Exon 25 of 35	5	NM_001283009.2	ENSP00000353332.5
RTEL1	ENST00000508582.7	c.2291_2299delATGTCATCC	p.His764_Ile766del	disruptive_inframe_deletion	Exon 25 of 35	2		ENSP00000424307.2
RTEL1	ENST00000370018.7	c.2219_2227delATGTCATCC	p.His740_Ile742del	disruptive_inframe_deletion	Exon 25 of 35	1		ENSP00000359035.3
RTEL1-TNFRSF6B	ENST00000492259.6	n.2226-130_2226-122delATGTCATCC		intron_variant	Intron 22 of 34	5		ENSP00000457428.1

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

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

Pathogenic, criteria provided, single submitter

research

University of Washington Center for Mendelian Genomics, University of Washington

May 19, 2015

- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Nov 13, 2020

Not observed in large population cohorts (Lek 2016); In-frame deletion of three amino acids in a non-repeat region; In silico analysis supports a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25607374) -

Pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 15, 2015

- -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs863225053; hg19: chr20-62321514;