Genetic Variant TCTN1:c.473-5_473-4delAA (chr12-110628757-TAA-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001082538.3(TCTN1):c.473-5_473-4delAA variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000209 in 1,434,288 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

TCTN1
NM_001082538.3 splice_region, intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.570

Publications

2 publications found

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:

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]

HVCN1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCTN1	NM_001082538.3 link	c.473-5_473-4delAA		splice_region_variant, intron_variant	Intron 3 of 14	ENST00000397659.9	NP_001076007.1	Q2MV58-2B4DIB9

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
TCTN1	ENST00000397659.9 link	c.473-9_473-8delAA	splice_region_variant, intron_variant	Intron 3 of 14	1	NM_001082538.3	ENSP00000380779.4	Q2MV58-2
TCTN1	ENST00000551590.5 link	c.473-9_473-8delAA	splice_region_variant, intron_variant	Intron 3 of 14	1		ENSP00000448735.1	Q2MV58-1
TCTN1	ENST00000397655.7 link	c.473-9_473-8delAA	splice_region_variant, intron_variant	Intron 3 of 14	1		ENSP00000380775.3	Q2MV58-3
TCTN1	ENST00000397656.8 link	n.106-9_106-8delAA	splice_region_variant, intron_variant	Intron 4 of 15	2		ENSP00000380776.4	J3KPW2
TCTN1	ENST00000480648.5 link	n.473-9_473-8delAA	splice_region_variant, intron_variant	Intron 3 of 15	5		ENSP00000437196.1	E9PNE4
TCTN1	ENST00000495659.6 link	n.231-9_231-8delAA	splice_region_variant, intron_variant	Intron 3 of 14	2		ENSP00000436673.2	E9PIB8

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000821

AC:

AN:

243572

AF XY:

0.0000151

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000587

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000209

AC:

AN:

1434288

Hom.:

AF XY:

0.00000420

AC XY:

AN XY:

715130

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32906

American (AMR)

AF:

0.0000674

AC:

AN:

44494

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25958

East Asian (EAS)

AF:

0.00

AC:

AN:

39454

South Asian (SAS)

AF:

0.00

AC:

AN:

85478

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50336

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5538

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1090594

Other (OTH)

AF:

0.00

AC:

AN:

59530

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.57

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

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12-110628757-TAAA-TA

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over