rs370011798

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_182916.3(TRNT1):c.668T>C(p.Ile223Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000923 in 1,613,980 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000094 ( 0 hom. )

Consequence

TRNT1
NM_182916.3 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 7.78

Variant links:

Genes affected

TRNT1 (HGNC:17341): (tRNA nucleotidyl transferase 1) The protein encoded by this gene is a CCA-adding enzyme which belongs to the tRNA nucleotidyltransferase/poly(A) polymerase family. This essential enzyme functions by catalyzing the addition of the conserved nucleotide triplet CCA to the 3' terminus of tRNA molecules. Mutations in this gene result in sideroblastic anemia with B-cell immunodeficiency, periodic fevers, and developmental delay. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

TRNT1 links:

CRBN (HGNC:30185): (cereblon) This gene encodes a protein related to the Lon protease protein family. In rodents and other mammals this gene product is found in the cytoplasm localized with a calcium channel membrane protein, and is thought to play a role in brain development. Mutations in this gene are associated with autosomal recessive nonsyndromic cognitive disability. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2010]

CRBN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.95

PP5

Variant 3-3146489-T-C is Pathogenic according to our data. Variant chr3-3146489-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 157614.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRNT1	NM_182916.3 link	c.668T>C	p.Ile223Thr	missense_variant	Exon 6 of 8	ENST00000251607.11	NP_886552.3	Q96Q11-1A0A024R2H7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRNT1	ENST00000251607.11 link	c.668T>C	p.Ile223Thr	missense_variant	Exon 6 of 8	1	NM_182916.3	ENSP00000251607.6		Q96Q11-1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

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:

0.0000882

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.0000318

AC:

AN:

251240

Hom.:

AF XY:

0.0000515

AC XY:

AN XY:

135808

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000704

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000937

AC:

137

AN:

1461698

Hom.:

Cov.:

AF XY:

0.0000921

AC XY:

AN XY:

727156

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

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:

0.000119

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000788

AC:

AN:

152282

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.0000722

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:

0.0000882

Gnomad4 OTH

AF:

0.000947

Alfa

AF:

0.000212

Hom.:

Bravo

AF:

0.0000793

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3

Apr 05, 2025

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies found this variant is associated with significantly reduced enzyme activity and stability (PMID: 29454993); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at a significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29358286, 27370603, 25193871, 31555444, 31338833, 29454993, 35984545, 29055896) -

Sep 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

TRNT1: PM3:Strong, PM1, PM2, PM5, PS3:Supporting -

Aug 08, 2018

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Congenital sideroblastic anemia-B-cell immunodeficiency-periodic fever-developmental delay syndrome

Pathogenic:2

Oct 30, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Dec 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 223 of the TRNT1 protein (p.Ile223Thr). This variant is present in population databases (rs370011798, gnomAD 0.009%). This missense change has been observed in individual(s) with sideroblastic anemia with B-cell immunodeficiency, periodic fevers, and developmental delay (PMID: 25193871, 27370603, 29055896, 29358286). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 157614). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt TRNT1 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects TRNT1 function (PMID: 25193871, 29454993). For these reasons, this variant has been classified as Pathogenic. -

TRNT1-related disorder

Pathogenic:1

Mar 22, 2023

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The TRNT1 c.668T>C variant is predicted to result in the amino acid substitution p.Ile223Thr. This variant has been reported in the compound heterozygous and homozygous states in individuals with sideroblastic anemia with immunodeficiency, fevers, and developmental delay (SIFD) (Chakraborty et al. 2014. PubMed ID: 25193871; Wedatilake et al. 2016. PubMed ID: 2737060; Barton et al. 2018. PubMed ID: 29055896; Giannelou et al. 2018. PubMed ID: 29358286; Jfri et al. 2019. PubMed ID: 31555444). Of note, in addition to the clinical features typically associated with SIFD, metabolic features and severe fetal hydrops and neonatal anemia were also reported in cases of SIFD (Wedatilake et al. 2016. PubMed ID: 2737060; Barton et al. 2018. PubMed ID: 29055896). A functional study showed that that c.668T>C (p.Ile223Thr) variant impacts protein function (Leibovitch et al. 2018. PubMed ID: 29454993). This variant is reported in 0.0077% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/3-3188173-T-C). This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.59

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Pathogenic

0.22

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.77

D;.

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.86

.;D

M_CAP

Uncertain

0.11

MetaRNN

Pathogenic

0.95

D;D

MetaSVM

Uncertain

0.061

MutationAssessor

Pathogenic

3.4

M;M

PrimateAI

Uncertain

0.69

PROVEAN

Pathogenic

-4.5

D;D

REVEL

Pathogenic

0.85

Sift

Uncertain

0.0010

D;D

Sift4G

Pathogenic

0.0010

D;D

Polyphen

0.99

D;P

Vest4

0.95

MVP

0.64

MPC

0.020

ClinPred

0.89

GERP RS

5.3

Varity_R

0.89

gMVP

0.90

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