1-11022278-G-C

Variant names:

• chr1-11022278-G-C
• rs121908395
• NM_007375.4:c.869G>C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP2

The NM_007375.4(TARDBP):​c.869G>C​(p.Gly290Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,672 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TARDBP NM_007375.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 7.62

Genes affected

TARDBP (HGNC:11571): (TAR DNA binding protein) HIV-1, the causative agent of acquired immunodeficiency syndrome (AIDS), contains an RNA genome that produces a chromosomally integrated DNA during the replicative cycle. Activation of HIV-1 gene expression by the transactivator Tat is dependent on an RNA regulatory element (TAR) located downstream of the transcription initiation site. The protein encoded by this gene is a transcriptional repressor that binds to chromosomally integrated TAR DNA and represses HIV-1 transcription. In addition, this protein regulates alternate splicing of the CFTR gene. A similar pseudogene is present on chromosome 20. [provided by RefSeq, Jul 2008]

MASP2 (HGNC:6902): (MBL associated serine protease 2) This gene encodes a member of the peptidase S1 family of serine proteases. The encoded preproprotein is proteolytically processed to generate A and B chains that heterodimerize to form the mature protease. This protease cleaves complement components C2 and C4 in order to generate C3 convertase in the lectin pathway of the complement system. The encoded protease also plays a role in the coagulation cascade through cleavage of prothrombin to form thrombin. Myocardial infarction and acute stroke patients exhibit reduced serum concentrations of the encoded protein. Alternative splicing results in multiple transcript variants, at least one of which encodes an isoform that is proteolytically processed. [provided by RefSeq, Feb 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_007375.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the TARDBP gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 22 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 3.7095 (above the threshold of 3.09). Trascript score misZ: 5.3115 (above the threshold of 3.09). GenCC associations: The gene is linked to amyotrophic lateral sclerosis type 10, amyotrophic lateral sclerosis, frontotemporal dementia with motor neuron disease.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TARDBP	NM_007375.4	c.869G>C	p.Gly290Ala	missense_variant	Exon 6 of 6	ENST00000240185.8	NP_031401.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TARDBP	ENST00000240185.8	c.869G>C	p.Gly290Ala	missense_variant	Exon 6 of 6	1	NM_007375.4	ENSP00000240185.4
TARDBP	ENST00000649624.1	c.768+101G>C		intron_variant	Intron 5 of 5			ENSP00000497327.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461672 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727146

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Amyotrophic lateral sclerosis type 10 Pathogenic:1

May 01, 2008

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Amyotrophic lateral sclerosis type 10;C3150169:TARDBP-related frontotemporal dementia Uncertain:1

Mar 25, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. This variant has been reported to affect TARDBP protein function (PMID: 19515851, 21123567). This variant has been observed in a family affected with amyotrophic lateral sclerosis (PMID: 18396105). ClinVar contains an entry for this variant (Variation ID: 5231). This variant is not present in population databases (ExAC no frequency). This sequence change replaces glycine with alanine at codon 290 of the TARDBP protein (p.Gly290Ala). The glycine residue is moderately conserved and there is a small physicochemical difference between glycine and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Benign	19
DANN	Benign	0.94
DEOGEN2	Uncertain	0.47	T;T;T
Eigen	Benign	0.083
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	.;D;D
M_CAP	Benign	0.051	D
MetaRNN	Uncertain	0.71	D;D;D
MetaSVM	Uncertain	-0.14	T
MutationAssessor	Benign	1.4	L;L;.
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-0.98	N;.;.
REVEL	Uncertain	0.54
Sift	Benign	0.39	T;.;.
Sift4G	Benign	0.21	T;.;D
Polyphen		0.020	B;B;.
Vest4		0.87
MutPred		0.75		Loss of phosphorylation at S292 (P = 0.1921);Loss of phosphorylation at S292 (P = 0.1921);.;
MVP		0.99
MPC		1.0
ClinPred		0.54	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.8
Varity_R		0.43
gMVP		0.92

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs121908395; hg19: chr1-11082335;