3-12519134-TAC-AGT

Variant names:

• chr3-12519134-TAC-AGT
• NM_025265.4:c.1036_1038delTACinsAGT
• TSEN2 p.Tyr346Ser

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM5

The NM_025265.4(TSEN2):​c.1036_1038delTACinsAGT​(p.Tyr346Ser) variant causes a missense change. 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. Y346C) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TSEN2 NM_025265.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.49
• Publications: 0 publications found

Genes affected

TSEN2 (HGNC:28422): (tRNA splicing endonuclease subunit 2) This gene encodes one of the subunits of the tRNA splicing endonuclease. This endonuclease catalyzes the first step in RNA splicing which is the removal of introns. Mutations in this gene have been associated with pontocerebellar hypoplasia type 2. A pseudogene has been identified on chromosome 4. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Feb 2009]

MKRN2OS (HGNC:40375): (MKRN2 opposite strand)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-12519135-A-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 495252.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_025265.4. 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
	TSEN2	NM_025265.4	MANE Select	c.1036_1038delTACinsAGT	p.Tyr346Ser	missense	N/A	NP_079541.1	Q8NCE0-1
	TSEN2	NM_001321278.2		c.1036_1038delTACinsAGT	p.Tyr346Ser	missense	N/A	NP_001308207.1	C9J7Z4
	TSEN2	NM_001145392.2		c.1036_1038delTACinsAGT	p.Tyr346Ser	missense	N/A	NP_001138864.1	Q8NCE0-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSEN2	ENST00000284995.11	TSL:1 MANE Select	c.1036_1038delTACinsAGT	p.Tyr346Ser	missense	N/A	ENSP00000284995.6	Q8NCE0-1
	TSEN2	ENST00000402228.7	TSL:1	c.1036_1038delTACinsAGT	p.Tyr346Ser	missense	N/A	ENSP00000385976.3	Q8NCE0-1
	TSEN2	ENST00000454502.6	TSL:1	c.859_861delTACinsAGT	p.Tyr287Ser	missense	N/A	ENSP00000392029.2	Q8NCE0-4

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.5

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: chr3-12560633;