chr5-179820930-G-C

Variant names:

• chr5-179820930-G-C
• rs907862704
• NM_003900.5:c.-7G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003900.5(SQSTM1):​c.-7G>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000725 in 1,378,644 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: SQSTM1 NM_003900.5 5_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.712
• Publications: 0 publications found

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]

SQSTM1 Gene-Disease associations (from GenCC):

• neurodegeneration with ataxia, dystonia, and gaze palsy, childhood-onset

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Illumina
• frontotemporal dementia and/or amyotrophic lateral sclerosis 3

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen
• osteosarcoma

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• Paget disease of bone 3

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• amyotrophic lateral sclerosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• behavioral variant of frontotemporal dementia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• frontotemporal dementia with motor neuron disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000301422 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.72).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SQSTM1	NM_003900.5	c.-7G>C		5_prime_UTR_variant	Exon 1 of 8	ENST00000389805.9	NP_003891.1
SQSTM1	NM_001142298.2	c.-47-2028G>C		intron_variant	Intron 2 of 8		NP_001135770.1
SQSTM1	NM_001142299.2	c.-47-2028G>C		intron_variant	Intron 2 of 8		NP_001135771.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SQSTM1	ENST00000389805.9	c.-7G>C		5_prime_UTR_variant	Exon 1 of 8	1	NM_003900.5	ENSP00000374455.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 7.25e-7 AC: 1 AN: 1378644 Hom.: 0 Cov.: 31 AF XY: 0.00000147 AC XY: 1 AN XY: 680778

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 28486

American (AMR) AF: 0.00 AC: 0 AN: 37850

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24276

East Asian (EAS) AF: 0.00 AC: 0 AN: 33328

South Asian (SAS) AF: 0.00 AC: 0 AN: 79830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 38820

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5310

European-Non Finnish (NFE) AF: 9.31e-7 AC: 1 AN: 1073686

Other (OTH) AF: 0.00 AC: 0 AN: 57058

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Paget disease of bone 3 Uncertain:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.72
CADD	Benign	0.26
DANN	Benign	0.63
PhyloP100		-0.71
PromoterAI		-0.26	Neutral

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

Other links and lift over

dbSNP: rs907862704; hg19: chr5-179247930;