rs16940927

Variant names:

• chr12-110640433-C-A
• NM_001082538.3:c.894C>A

Your query was ambiguous. Multiple possible variants found:

• chr12-110640433-C-A
• chr12-110640433-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001082538.3(TCTN1):​c.894C>A​(p.Leu298Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. L298L) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TCTN1 NM_001082538.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.27

Genes affected

TCTN1 (HGNC:26113): (tectonic family member 1) This gene encodes a member of a family of secreted and transmembrane proteins. The orthologous gene in mouse functions downstream of smoothened and rab23 to modulate hedgehog signal transduction. This protein is a component of the tectonic-like complex, which forms a barrier between the ciliary axoneme and the basal body. A mutation in this gene was found in a family with Joubert syndrome-13. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2016]

HVCN1 (HGNC:28240): (hydrogen voltage gated channel 1) This gene encodes a voltage-gated protein channel protein expressed more highly in certain cells of the immune system. Phagocytic cells produce superoxide anions which require this channel protein, and in B cells this same process facilitates antibody production. This same channel protein, however, can also regulate functions in other cells including spermatozoa. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2012]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP7: Synonymous conserved (PhyloP=-1.27 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCTN1	NM_001082538.3	c.894C>A	p.Leu298Leu	synonymous_variant	Exon 8 of 15	ENST00000397659.9	NP_001076007.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TCTN1	ENST00000397659.9	c.894C>A	p.Leu298Leu	synonymous_variant	Exon 8 of 15	1	NM_001082538.3	ENSP00000380779.4
TCTN1	ENST00000551590.5	c.894C>A	p.Leu298Leu	synonymous_variant	Exon 8 of 15	1		ENSP00000448735.1
TCTN1	ENST00000397655.7	c.852C>A	p.Leu284Leu	synonymous_variant	Exon 8 of 15	1		ENSP00000380775.3
TCTN1	ENST00000397656.8	n.*527C>A		non_coding_transcript_exon_variant	Exon 9 of 16	2		ENSP00000380776.4
TCTN1	ENST00000480648.5	n.*170C>A		non_coding_transcript_exon_variant	Exon 9 of 16	5		ENSP00000437196.1
TCTN1	ENST00000495659.6	n.*652C>A		non_coding_transcript_exon_variant	Exon 8 of 15	2		ENSP00000436673.2
TCTN1	ENST00000397656.8	n.*527C>A		3_prime_UTR_variant	Exon 9 of 16	2		ENSP00000380776.4
TCTN1	ENST00000480648.5	n.*170C>A		3_prime_UTR_variant	Exon 9 of 16	5		ENSP00000437196.1
TCTN1	ENST00000495659.6	n.*652C>A		3_prime_UTR_variant	Exon 8 of 15	2		ENSP00000436673.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461888 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727244

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	0.24
DANN	Benign	0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-111078238;