4-121902899-T-G

Variant names:

• chr4-121902899-T-G
• NM_001130698.2:c.2416A>C
• TRPC3 p.Arg806Arg

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_001130698.2(TRPC3):​c.2416A>C​(p.Arg806Arg) 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. R806R) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TRPC3 NM_001130698.2 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.533
• Publications: 0 publications found

Genes affected

TRPC3 (HGNC:12335): (transient receptor potential cation channel subfamily C member 3) The protein encoded by this gene is a membrane protein that can form a non-selective channel permeable to calcium and other cations. The encoded protein appears to be induced to form channels by a receptor tyrosine kinase-activated phosphatidylinositol second messenger system and also by depletion of intracellular calcium stores. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2011]

TRPC3 Gene-Disease associations (from GenCC):

• spinocerebellar ataxia type 41

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.46).
• BP7: Synonymous conserved (PhyloP=0.533 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001130698.2. 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
	TRPC3	NM_001130698.2	MANE Select	c.2416A>C	p.Arg806Arg	synonymous	Exon 9 of 12	NP_001124170.1	Q13507-2
	TRPC3	NM_001366479.2		c.2416A>C	p.Arg806Arg	synonymous	Exon 9 of 11	NP_001353408.1
	TRPC3	NM_003305.2		c.2197A>C	p.Arg733Arg	synonymous	Exon 8 of 11	NP_003296.1	Q13507-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRPC3	ENST00000379645.8	TSL:1 MANE Select	c.2416A>C	p.Arg806Arg	synonymous	Exon 9 of 12	ENSP00000368966.3	Q13507-2
	TRPC3	ENST00000264811.9	TSL:1	c.2197A>C	p.Arg733Arg	synonymous	Exon 8 of 11	ENSP00000264811.5	Q13507-3
	TRPC3	ENST00000513531.1	TSL:1	c.2032A>C	p.Arg678Arg	synonymous	Exon 7 of 10	ENSP00000426899.1	J3QTB0

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.46
CADD	Benign	9.4
DANN	Benign	0.65
PhyloP100		0.53

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: chr4-122824054;