NM_003900.5:c.3G>C

Variant names:

• chr5-179820939-G-C
• NM_003900.5:c.3G>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_003900.5(SQSTM1):​c.3G>C​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 34)
• Consequence: SQSTM1 NM_003900.5 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.26

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 252 CDS bases. Genomic position: 179823004. Lost 0.190 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SQSTM1	NM_003900.5	c.3G>C	p.Met1?	start_lost	Exon 1 of 8	ENST00000389805.9	NP_003891.1
SQSTM1	NM_001142298.2	c.-47-2019G>C		intron_variant	Intron 2 of 8		NP_001135770.1
SQSTM1	NM_001142299.2	c.-47-2019G>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.3G>C	p.Met1?	start_lost	Exon 1 of 8	1	NM_003900.5	ENSP00000374455.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Feb 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects the initiator methionine of the SQSTM1 mRNA. The next in-frame methionine is located at codon 85. This variant is not present in population databases (gnomAD no frequency). Disruption of the initiator codon has been observed in individual(s) with clinical features of autosomal recessive SQSTM1-related conditions (PMID: 27545679). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.23
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.32	T;T;T;T
Eigen	Benign	-0.039
Eigen_PC	Benign	0.048
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D;.;D;.
M_CAP	Pathogenic	1.0	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Uncertain	-0.21	T
PROVEAN	Benign	-1.5	N;.;N;N
REVEL	Uncertain	0.29
Sift	Pathogenic	0.0	D;.;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		0.27	B;.;.;B
Vest4		0.80
MutPred		1.0		Gain of catalytic residue at M1 (P = 0.0109);Gain of catalytic residue at M1 (P = 0.0109);Gain of catalytic residue at M1 (P = 0.0109);Gain of catalytic residue at M1 (P = 0.0109);
MVP		0.93
ClinPred		0.99	D
GERP RS		4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.97
gMVP		0.50

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-179247939;