NM_006852.6:c.890G>A

Variant names:

• chr17-62565059-G-A
• rs1555639254
• NM_006852.6:c.890G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP2 PP3_Moderate PP5

The NM_006852.6(TLK2):​c.890G>A​(p.Gly297Asp) variant causes a missense change involving the alteration of a 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G297V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: TLK2 NM_006852.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 10.0
• Publications: 0 publications found

Genes affected

TLK2 (HGNC:11842): (tousled like kinase 2) This gene encodes a nuclear serine/threonine kinase that was first identified in Arabidopsis. The encoded protein is thought to function in the regulation of chromatin assembly in the S phase of the cell cycle by regulating the levels of a histone H3/H4 chaperone. This protein is associated with double-strand break repair of DNA damage caused by radiation. Pseudogenes of this gene are present on chromosomes 10 and 17. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

TLK2 Gene-Disease associations (from GenCC):

• intellectual disability, autosomal dominant 57

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Illumina, Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the TLK2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 18 curated pathogenic missense variants (we use a threshold of 10). The gene has 4 curated benign missense variants. Gene score misZ: 4.4909 (above the threshold of 3.09). Trascript score misZ: 6.538 (above the threshold of 3.09). GenCC associations: The gene is linked to intellectual disability, autosomal dominant 57.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.874
• PP5: Variant 17-62565059-G-A is Pathogenic according to our data. Variant chr17-62565059-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 548937.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006852.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TLK2	NM_006852.6	MANE Select	c.890G>A	p.Gly297Asp	missense	Exon 11 of 22	NP_006843.2
	TLK2	NM_001284333.3		c.890G>A	p.Gly297Asp	missense	Exon 11 of 23	NP_001271262.1
	TLK2	NM_001375269.1		c.932G>A	p.Gly311Asp	missense	Exon 10 of 21	NP_001362198.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TLK2	ENST00000346027.10	TSL:1 MANE Select	c.890G>A	p.Gly297Asp	missense	Exon 11 of 22	ENSP00000275780.7
	TLK2	ENST00000326270.13	TSL:1	c.890G>A	p.Gly297Asp	missense	Exon 11 of 23	ENSP00000316512.9
	TLK2	ENST00000343388.11	TSL:1	c.794G>A	p.Gly265Asp	missense	Exon 10 of 21	ENSP00000340800.7

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Intellectual disability, autosomal dominant 57 Pathogenic:2 Uncertain:1

Oct 15, 2018

SIB Swiss Institute of Bioinformatics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

This variant is interpreted as Uncertain Significance - Insufficient Evidence, for Mental retardation, autosomal dominant 57. The following ACMG Tag(s) were applied: PM2 => Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. PP3 => Multiple lines of computational evidence support a deleterious effect on the gene or gene product. PM6 => Assumed de novo, but without confirmation of paternity and maternity (https://www.ncbi.nlm.nih.gov/pubmed/29861108).

Institute of Human Genetics, University Hospital of Duesseldorf

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: not provided

Apr 29, 2022

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	32
DANN	Benign	0.96
DEOGEN2	Benign	0.33	T
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.87	D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.87	D
MetaSVM	Uncertain	0.42	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		10
PrimateAI	Pathogenic	0.93	D
PROVEAN	Pathogenic	-6.7	D
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.74
MutPred		0.50		Gain of catalytic residue at G297 (P = 0.0215)
MVP		0.95
MPC		3.0
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.87
gMVP		0.74
Mutation Taster		=0/100	disease causing

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: rs1555639254; hg19: chr17-60642420;