12-110614201-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001082538.3(TCTN1):c.19C>T(p.Pro7Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000705 in 1,419,150 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P7L) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

TCTN1
NM_001082538.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.152

Variant links:

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]

TCTN1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.12467384).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCTN1	NM_001082538.3 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 15	ENST00000397659.9	NP_001076007.1	Q2MV58-2B4DIB9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TCTN1	ENST00000397659.9 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 15	1	NM_001082538.3	ENSP00000380779.4	Q2MV58-2
TCTN1	ENST00000551590.5 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 15	1		ENSP00000448735.1	Q2MV58-1
TCTN1	ENST00000397655.7 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 15	1		ENSP00000380775.3	Q2MV58-3
TCTN1	ENST00000397656.8 link	n.19C>T		non_coding_transcript_exon_variant	Exon 1 of 16	2		ENSP00000380776.4	J3KPW2
TCTN1	ENST00000480648.5 link	n.19C>T		non_coding_transcript_exon_variant	Exon 1 of 16	5		ENSP00000437196.1	E9PNE4
TCTN1	ENST00000495659.6 link	n.19C>T		non_coding_transcript_exon_variant	Exon 1 of 15	2		ENSP00000436673.2	E9PIB8

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.05e-7

AC:

AN:

1419150

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

702174

show subpopulations

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:

0.00

Gnomad4 OTH exome

AF:

0.0000170

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

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

Uncertain:1

Nov 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 7 of the TCTN1 protein (p.Pro7Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TCTN1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1489973). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.075

BayesDel_addAF

Benign

-0.081

BayesDel_noAF

Benign

-0.35

CADD

Benign

8.1

DANN

Uncertain

0.98

DEOGEN2

Benign

0.027

.;.;T;.;T;.

Eigen

Benign

-0.85

Eigen_PC

Benign

-0.90

FATHMM_MKL

Benign

0.14

LIST_S2

Benign

0.78

T;T;T;T;T;T

M_CAP

Uncertain

0.17

MetaRNN

Benign

0.12

T;T;T;T;T;T

MetaSVM

Benign

-0.75

MutationAssessor

Benign

1.6

.;.;L;L;.;L

PrimateAI

Uncertain

0.50

PROVEAN

Benign

-0.34

.;.;N;N;.;N

REVEL

Benign

0.10

Sift

Uncertain

0.024

.;.;D;D;.;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D

Polyphen

0.27

B;.;B;B;.;B

Vest4

0.13

MutPred

0.35

Loss of sheet (P = 7e-04);Loss of sheet (P = 7e-04);Loss of sheet (P = 7e-04);Loss of sheet (P = 7e-04);Loss of sheet (P = 7e-04);Loss of sheet (P = 7e-04);

MVP

0.72

MPC

0.19

ClinPred

0.15

GERP RS

1.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.0

Varity_R

0.10

gMVP

0.43

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over