chr8-144438487-T-C

Variant names:

• chr8-144438487-T-C
• NM_013432.5:c.1637A>G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_013432.5(TONSL):​c.1637A>G​(p.Gln546Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,622 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TONSL NM_013432.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.65

Genes affected

TONSL (HGNC:7801): (tonsoku like, DNA repair protein) The protein encoded by this gene is thought to be a negative regulator of NF-kappa-B mediated transcription. The encoded protein may bind NF-kappa-B complexes and trap them in the cytoplasm, preventing them from entering the nucleus and interacting with the DNA. Phosphorylation of this protein targets it for degradation by the ubiquitination pathway, which frees the NF-kappa-B complexes to enter the nucleus. [provided by RefSeq, Jul 2008]

TONSL-AS1 (HGNC:51556): (TONSL antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a repeat ANK 1 (size 29) in uniprot entity TONSL_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_013432.5
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.22911632).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TONSL	NM_013432.5	c.1637A>G	p.Gln546Arg	missense_variant	Exon 13 of 26	ENST00000409379.8	NP_038460.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TONSL	ENST00000409379.8	c.1637A>G	p.Gln546Arg	missense_variant	Exon 13 of 26	1	NM_013432.5	ENSP00000386239.3
TONSL	ENST00000497613.2	n.2612A>G		non_coding_transcript_exon_variant	Exon 5 of 17	2
TONSL-AS1	ENST00000442850.1	n.178+154T>C		intron_variant	Intron 2 of 3	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460622 Hom.: 0 Cov.: 35 AF XY: 0.00000138 AC XY: 1 AN XY: 726684

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Apr 05, 2021

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. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with TONSL-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glutamine with arginine at codon 546 of the TONSL protein (p.Gln546Arg). The glutamine residue is highly conserved and there is a small physicochemical difference between glutamine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.084	T;.
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.23	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N;.
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-1.3	N;.
REVEL	Benign	0.11
Sift	Benign	0.33	T;.
Sift4G	Benign	0.16	T;T
Polyphen		0.13	B;.
Vest4		0.25
MutPred		0.50		Gain of MoRF binding (P = 0.0161);.;
MVP		0.65
MPC		0.19
ClinPred		0.31	T
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.056
gMVP		0.43

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: chr8-145663870;