11-59852991-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_001062.4(TCN1):c.1286G>A(p.Arg429His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000127 in 1,614,120 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00029 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00011 ( 3 hom. )

Consequence

TCN1
NM_001062.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 0.240

Variant links:

Genes affected

TCN1 (HGNC:11652): (transcobalamin 1) This gene encodes a member of the vitamin B12-binding protein family. This family of proteins, alternatively referred to as R binders, is expressed in various tissues and secretions. This protein is a major constituent of secondary granules in neutrophils and facilitates the transport of cobalamin into cells. [provided by RefSeq, Jul 2008]

TCN1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.026473403).

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCN1	NM_001062.4 link	c.1286G>A	p.Arg429His	missense_variant	Exon 9 of 9	ENST00000257264.4	NP_001053.2	P20061

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TCN1	ENST00000257264.4 link	c.1286G>A	p.Arg429His	missense_variant	Exon 9 of 9	1	NM_001062.4	ENSP00000257264.3		P20061
TCN1	ENST00000529251.1 link	n.285G>A		non_coding_transcript_exon_variant	Exon 3 of 3	3

Frequencies

GnomAD3 genomes

AF:

0.000289

AC:

AN:

152142

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000917

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000111

AC:

AN:

251320

Hom.:

AF XY:

0.000110

AC XY:

AN XY:

135814

show subpopulations

Gnomad AFR exome

AF:

0.000984

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000704

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000110

AC:

161

AN:

1461862

Hom.:

Cov.:

AF XY:

0.000102

AC XY:

AN XY:

727230

show subpopulations

Gnomad4 AFR exome

AF:

0.00197

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000603

Gnomad4 OTH exome

AF:

0.000215

GnomAD4 genome

AF:

0.000289

AC:

AN:

152258

Hom.:

Cov.:

AF XY:

0.000242

AC XY:

AN XY:

74422

show subpopulations

Gnomad4 AFR

AF:

0.000915

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000151

Hom.:

Bravo

AF:

0.000340

ESP6500AA

AF:

0.000909

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000107

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 04, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1286G>A (p.R429H) alteration is located in exon 9 (coding exon 9) of the TCN1 gene. This alteration results from a G to A substitution at nucleotide position 1286, causing the arginine (R) at amino acid position 429 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Transcobalamin I deficiency

Uncertain:1

Aug 20, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 429 of the TCN1 protein (p.Arg429His). This variant is present in population databases (rs147187383, gnomAD 0.09%). This variant has not been reported in the literature in individuals affected with TCN1-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The histidine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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

0.12

BayesDel_addAF

Benign

-0.54

BayesDel_noAF

Benign

-0.61

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Benign

0.060

Eigen

Benign

-0.88

Eigen_PC

Benign

-0.93

FATHMM_MKL

Benign

0.044

LIST_S2

Benign

0.50

M_CAP

Benign

0.0099

MetaRNN

Benign

0.026

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.9

PrimateAI

Benign

0.27

PROVEAN

Benign

-1.9

REVEL

Benign

0.074

Sift

Benign

0.49

Sift4G

Benign

0.15

Polyphen

0.059

Vest4

0.23

MVP

0.18

MPC

0.021

ClinPred

0.015

GERP RS

1.1

Varity_R

0.071

gMVP

0.41

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

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