1-235380155-C-T

Position:

chr1-235380155-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_003193.5(TBCE):c.100+6C>T variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000118 in 1,536,424 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00063 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000065 ( 0 hom. )

Consequence

TBCE
NM_003193.5 splice_donor_region, intron

Scores

Splicing: ADA: 0.00002739

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2B:1

Conservation

PhyloP100: 0.589

Variant links:

Genes affected

TBCE (HGNC:11582): (tubulin folding cofactor E) Cofactor E is one of four proteins (cofactors A, D, E, and C) involved in the pathway leading to correctly folded beta-tubulin from folding intermediates. Cofactors A and D are believed to play a role in capturing and stabilizing beta-tubulin intermediates in a quasi-native confirmation. Cofactor E binds to the cofactor D/beta-tubulin complex; interaction with cofactor C then causes the release of beta-tubulin polypeptides that are committed to the native state. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

TBCE links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=-0.88).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000625 (91/145540) while in subpopulation AFR AF= 0.00209 (82/39322). AF 95% confidence interval is 0.00172. There are 0 homozygotes in gnomad4. There are 51 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
TBCE	NM_003193.5 linkuse as main transcript	c.100+6C>T	splice_donor_region_variant, intron_variant	ENST00000642610.2
TBCE	NM_001079515.3 linkuse as main transcript	c.100+6C>T	splice_donor_region_variant, intron_variant
TBCE	NM_001287801.2 linkuse as main transcript	c.100+6C>T	splice_donor_region_variant, intron_variant
TBCE	NM_001287802.2 linkuse as main transcript	c.-211+6C>T	splice_donor_region_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TBCE	ENST00000642610.2 linkuse as main transcript	c.100+6C>T		splice_donor_region_variant, intron_variant			NM_003193.5	P1	Q15813-1

Frequencies

GnomAD3 genomes

AF:

0.000605

AC:

AN:

145428

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00201

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000562

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000501

GnomAD3 exomes

AF:

0.000141

AC:

AN:

248602

Hom.:

AF XY:

0.000126

AC XY:

AN XY:

134498

show subpopulations

Gnomad AFR exome

AF:

0.00182

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000178

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000654

AC:

AN:

1390884

Hom.:

Cov.:

AF XY:

0.0000605

AC XY:

AN XY:

694624

show subpopulations

Gnomad4 AFR exome

AF:

0.00198

Gnomad4 AMR exome

AF:

0.000113

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:

0.00000476

Gnomad4 OTH exome

AF:

0.000261

GnomAD4 genome

AF:

0.000625

AC:

AN:

145540

Hom.:

Cov.:

AF XY:

0.000723

AC XY:

AN XY:

70492

show subpopulations

Gnomad4 AFR

AF:

0.00209

Gnomad4 AMR

AF:

0.000561

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000496

Alfa

AF:

0.000385

Hom.:

Bravo

AF:

0.000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 26, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 31, 2022	This sequence change falls in intron 2 of the TBCE gene. It does not directly change the encoded amino acid sequence of the TBCE protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs182896657, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with TBCE-related conditions. ClinVar contains an entry for this variant (Variation ID: 595734). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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. -

TBCE-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 12, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.88

CADD

Benign

3.6

DANN

Benign

0.52

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000027

dbscSNV1_RF

Benign

0.0

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over