6-167340442-C-A

Variant names:

• chr6-167340442-C-A
• rs199812982
• NM_031949.5:c.542C>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_031949.5(TTLL2):​c.542C>A​(p.Thr181Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T181M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TTLL2 NM_031949.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.14
• Publications: 3 publications found

Genes affected

TTLL2 (HGNC:21211): (tubulin tyrosine ligase like 2) Predicted to enable tubulin binding activity and tubulin-glutamic acid ligase activity. Predicted to be involved in microtubule cytoskeleton organization and protein polyglutamylation. Predicted to be active in cilium. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.917

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_031949.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTLL2	NM_031949.5	MANE Select	c.542C>A	p.Thr181Lys	missense	Exon 3 of 3	NP_114155.4
	TTLL2	NM_001410948.1		c.323C>A	p.Thr108Lys	missense	Exon 2 of 2	NP_001397877.1	A0A3B3IRU1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTLL2	ENST00000239587.10	TSL:1 MANE Select	c.542C>A	p.Thr181Lys	missense	Exon 3 of 3	ENSP00000239587.5	Q9BWV7
	TTLL2	ENST00000515138.1	TSL:1	n.542C>A		non_coding_transcript_exon	Exon 3 of 6	ENSP00000424130.1	Q9BWV7
	TTLL2	ENST00000649884.1		c.323C>A	p.Thr108Lys	missense	Exon 2 of 2	ENSP00000497040.1	A0A3B3IRU1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461890 Hom.: 0 Cov.: 36 AF XY: 0.00000138 AC XY: 1 AN XY: 727246

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Uncertain	0.043	T
BayesDel_noAF	Benign	-0.18
CADD	Benign	19
DANN	Benign	0.96
DEOGEN2	Benign	0.19	T
Eigen	Benign	0.13
Eigen_PC	Benign	-0.14
FATHMM_MKL	Benign	0.28	N
LIST_S2	Benign	0.68	T
M_CAP	Benign	0.0013	T
MetaRNN	Pathogenic	0.92	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Pathogenic	3.6	H
PhyloP100		3.1
PrimateAI	Benign	0.36	T
PROVEAN	Uncertain	-3.5	D
REVEL	Benign	0.23
Sift	Uncertain	0.012	D
Sift4G	Uncertain	0.036	D
Polyphen		1.0	D
Vest4		0.38
MutPred		0.86		Gain of methylation at T181 (P = 0.0017)
MVP		0.055
MPC		0.62
ClinPred		0.97	D
GERP RS		2.6
Varity_R		0.69
gMVP		0.78
Mutation Taster		=83/17	polymorphism

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: rs199812982; hg19: chr6-167753930;