2-47073806-C-G

Variant names:

• chr2-47073806-C-G
• NM_020458.4:c.2460C>G
• TTC7A p.Gly820Gly

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_020458.4(TTC7A):​c.2460C>G​(p.Gly820Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G820G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TTC7A NM_020458.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.85
• Publications: 0 publications found

Genes affected

TTC7A (HGNC:19750): (tetratricopeptide repeat domain 7A) This gene encodes a protein containing tetratricopeptide repeats. Mutations in this gene disrupt intestinal development and can cause early onset inflammatory bowel disease and intestinal atresia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

ENSG00000273269 (HGNC:):

STPG4 (HGNC:26850): (sperm-tail PG-rich repeat containing 4) Predicted to enable chromatin binding activity and histone binding activity. Predicted to be involved in DNA demethylation of male pronucleus and positive regulation of DNA demethylation. Predicted to act upstream of or within C-5 methylation of cytosine. Predicted to be located in cytoplasm and nucleus. Predicted to be active in female pronucleus; germinal vesicle; and male pronucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP7: Synonymous conserved (PhyloP=-3.85 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020458.4. 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
	TTC7A	NM_020458.4	MANE Select	c.2460C>G	p.Gly820Gly	synonymous	Exon 20 of 20	NP_065191.2	Q9ULT0-1
	TTC7A	NM_001288951.2		c.2532C>G	p.Gly844Gly	synonymous	Exon 21 of 21	NP_001275880.1	Q9ULT0-4
	TTC7A	NM_001288953.2		c.2358C>G	p.Gly786Gly	synonymous	Exon 21 of 21	NP_001275882.1	G5E9G4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTC7A	ENST00000319190.11	TSL:2 MANE Select	c.2460C>G	p.Gly820Gly	synonymous	Exon 20 of 20	ENSP00000316699.5	Q9ULT0-1
	TTC7A	ENST00000394850.6	TSL:1	c.2532C>G	p.Gly844Gly	synonymous	Exon 21 of 21	ENSP00000378320.2	Q9ULT0-4
	TTC7A	ENST00000409825.5	TSL:1	n.*2209C>G		non_coding_transcript_exon	Exon 21 of 21	ENSP00000386521.1	H0Y3V7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
CADD	Benign	1.3
DANN	Benign	0.80
PhyloP100		-3.8
Mutation Taster		=99/1	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

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: chr2-47300945;