21-37087277-GA-AG

Variant names:

• chr21-37087277-GA-AG
• NM_001330683.2:c.20_21delGAinsAG
• TTC3 p.Gly7Glu

Variant summary

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

The NM_001330683.2(TTC3):​c.20_21delGAinsAG​(p.Gly7Glu) 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 nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TTC3 NM_001330683.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.08
• Publications: 0 publications found

Genes affected

TTC3 (HGNC:12393): (tetratricopeptide repeat domain 3) Enables ubiquitin-protein transferase activity. Involved in protein K48-linked ubiquitination and ubiquitin-dependent protein catabolic process. Located in cytosol; nucleolus; and nucleoplasm. [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_001330683.2. 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
	TTC3	NM_001330683.2	MANE Select	c.20_21delGAinsAG	p.Gly7Glu	missense	N/A	NP_001317612.1	P53804-1
	TTC3	NM_001320703.2		c.86_87delGAinsAG	p.Gly29Glu	missense	N/A	NP_001307632.1
	TTC3	NM_001320704.2		c.20_21delGAinsAG	p.Gly7Glu	missense	N/A	NP_001307633.1	H7BZ57

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTC3	ENST00000418766.6	TSL:5 MANE Select	c.20_21delGAinsAG	p.Gly7Glu	missense	N/A	ENSP00000403943.2	P53804-1
	TTC3	ENST00000354749.6	TSL:1	c.20_21delGAinsAG	p.Gly7Glu	missense	N/A	ENSP00000346791.2	P53804-1
	TTC3	ENST00000399017.6	TSL:1	c.20_21delGAinsAG	p.Gly7Glu	missense	N/A	ENSP00000381981.2	P53804-1

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		1.1

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: chr21-38459577;