5-179836439-CT-C

Variant names:

• chr5-179836439-CT-C
• rs1758558921
• NM_003900.5:c.1170delT

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 12P and 1B. PVS1_Strong PP5_Very_Strong BS2_Supporting

The NM_003900.5(SQSTM1):​c.1170delT​(p.Asp391ThrfsTer4) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,880 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: SQSTM1 NM_003900.5 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: -0.00800

Genes affected

SQSTM1 (HGNC:11280): (sequestosome 1) This gene encodes a multifunctional protein that binds ubiquitin and regulates activation of the nuclear factor kappa-B (NF-kB) signaling pathway. The protein functions as a scaffolding/adaptor protein in concert with TNF receptor-associated factor 6 to mediate activation of NF-kB in response to upstream signals. Alternatively spliced transcript variants encoding either the same or different isoforms have been identified for this gene. Mutations in this gene result in sporadic and familial Paget disease of bone. [provided by RefSeq, Mar 2009]

MRNIP (HGNC:30817): (MRN complex interacting protein) Enables chromatin binding activity. Involved in several processes, including mitotic G2 DNA damage checkpoint signaling; regulation of double-strand break repair; and response to ionizing radiation. Located in nucleoplasm. Colocalizes with Mre11 complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.116 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PP5: Variant 5-179836439-CT-C is Pathogenic according to our data. Variant chr5-179836439-CT-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1069495.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS2: High AC in GnomAdExome4 at 7 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SQSTM1	NM_003900.5	c.1170delT	p.Asp391ThrfsTer4	frameshift_variant	Exon 8 of 8	ENST00000389805.9	NP_003891.1
SQSTM1	NM_001142298.2	c.918delT	p.Asp307ThrfsTer4	frameshift_variant	Exon 9 of 9		NP_001135770.1
SQSTM1	NM_001142299.2	c.918delT	p.Asp307ThrfsTer4	frameshift_variant	Exon 9 of 9		NP_001135771.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SQSTM1	ENST00000389805.9	c.1170delT	p.Asp391ThrfsTer4	frameshift_variant	Exon 8 of 8	1	NM_003900.5	ENSP00000374455.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461880 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 727240

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: 0.00000540

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Paget disease of bone 2, early-onset;C5779877:Frontotemporal dementia and/or amyotrophic lateral sclerosis 1 Pathogenic:1

Mar 23, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This premature translational stop signal has been observed in individual(s) with autosomal dominant Paget's disease of bone (PMID: 14584883). It has also been observed to segregate with disease in related individuals. This variant is also known as 1210delT. ClinVar contains an entry for this variant (Variation ID: 1069495). For these reasons, this variant has been classified as Pathogenic. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Asp391Thrfs*4) in the SQSTM1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 50 amino acid(s) of the SQSTM1 protein. -

not provided Pathogenic:1

Apr 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SQSTM1: PVS1:Strong, PM2 -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1758558921; hg19: chr5-179263439;