chr12-110628749-G-GT

Position:

• chr12-110628749-G-GT

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 2P and 12B. PM2 BP6_Very_Strong BS1

The NM_001082538.3(TCTN1):​c.473-10dup variant causes a splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000208 in 1,579,872 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.000092 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00022 (0 hom.)
• Consequence: TCTN1 NM_001082538.3 splice_polypyrimidine_tract, intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.239

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 Benign. Variant got -10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 12-110628749-G-GT is Benign according to our data. Variant chr12-110628749-G-GT is described in ClinVar as [Likely_benign]. Clinvar id is 1168485.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.00022 (314/1428052) while in subpopulation MID AF= 0.000739 (4/5414). AF 95% confidence interval is 0.000251. There are 0 homozygotes in gnomad4_exome. There are 148 alleles in male gnomad4_exome subpopulation. Median coverage is 29. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TCTN1	NM_001082538.3	c.473-10dup		splice_polypyrimidine_tract_variant, intron_variant		ENST00000397659.9	NP_001076007.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TCTN1	ENST00000397659.9	c.473-10dup		splice_polypyrimidine_tract_variant, intron_variant		1	NM_001082538.3	ENSP00000380779	A1

Frequencies

GnomAD3 genomes AF: 0.0000923 AC: 14 AN: 151704 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000726

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.000220 AC: 314 AN: 1428052 Hom.: 0 Cov.: 29 AF XY: 0.000208 AC XY: 148 AN XY: 712180

Gnomad4 AFR exome AF: 0.0000611

Gnomad4 AMR exome AF: 0.0000452

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000508

Gnomad4 SAS exome AF: 0.0000940

Gnomad4 FIN exome AF: 0.0000407

Gnomad4 NFE exome AF: 0.000256

Gnomad4 OTH exome AF: 0.000270

GnomAD4 genome AF: 0.0000922 AC: 14 AN: 151820 Hom.: 0 Cov.: 32 AF XY: 0.0000674 AC XY: 5 AN XY: 74214

Gnomad4 AFR AF: 0.0000724

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000147

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Meckel-Gruber syndrome;C0431399:Familial aplasia of the vermis Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 28, 2023

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Nov 02, 2018

- -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs771463400; hg19: chr12-111066554;