8-55773658-CTC-GTT

Variant names:

• chr8-55773658-CTC-GTT
• NM_024831.8:c.40_42delCTCinsGTT
• TGS1 p.Leu14Val

Variant summary

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

The NM_024831.8(TGS1):​c.40_42delCTCinsGTT​(p.Leu14Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. 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. L14F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 34)
• Consequence: TGS1 NM_024831.8 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.31
• Publications: 0 publications found

Genes affected

TGS1 (HGNC:17843): (trimethylguanosine synthase 1) Enables RNA trimethylguanosine synthase activity. Involved in 7-methylguanosine cap hypermethylation. Located in cytosol and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024831.8. 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
	TGS1	NM_024831.8	MANE Select	c.40_42delCTCinsGTT	p.Leu14Val	missense	N/A	NP_079107.6
	TGS1	NM_001363184.2		c.-175_-173delCTCinsGTT		5_prime_UTR	Exon 1 of 12	NP_001350113.1
	TGS1	NM_001317902.2		c.-175_-173delCTCinsGTT		5_prime_UTR	Exon 1 of 11	NP_001304831.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TGS1	ENST00000260129.6	TSL:1 MANE Select	c.40_42delCTCinsGTT	p.Leu14Val	missense	N/A	ENSP00000260129.5	Q96RS0
	TGS1	ENST00000523948.5	TSL:1	n.40_42delCTCinsGTT		non_coding_transcript_exon	Exon 1 of 11	ENSP00000430467.1	E5RJW7
	TGS1	ENST00000938743.1		c.40_42delCTCinsGTT	p.Leu14Val	missense	N/A	ENSP00000608802.1

Frequencies

GnomAD3 genomes Cov.: 34

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr8-56686217;