rs147740901

Positions:

chr3-53092496-G-A

Variant summary

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

The NM_052859.4(RFT1):c.1331C>T(p.Thr444Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000513 in 1,612,476 control chromosomes in the GnomAD database, including 4 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 (★★). Synonymous variant affecting the same amino acid position (i.e. T444T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00053 ( 4 hom. )

Consequence

RFT1
NM_052859.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 1.47

Variant links:

Genes affected

RFT1 (HGNC:30220): (RFT1 homolog) This gene encodes an enzyme which catalyzes the translocation of the Man(5)GlcNAc (2)-PP-Dol intermediate from the cytoplasmic to the luminal side of the endoplasmic reticulum membrane in the pathway for the N-glycosylation of proteins. Mutations in this gene are associated with congenital disorder of glycosylation type In.[provided by RefSeq, Dec 2008]

RFT1 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=0.05360976).

BS2

High Homozygotes in GnomAdExome4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RFT1	NM_052859.4 linkuse as main transcript	c.1331C>T	p.Thr444Met	missense_variant	12/13	ENST00000296292.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RFT1	ENST00000296292.8 linkuse as main transcript	c.1331C>T	p.Thr444Met	missense_variant	12/13	1	NM_052859.4	P1
RFT1	ENST00000394738.7 linkuse as main transcript	c.1214C>T	p.Thr405Met	missense_variant	11/12	5

Frequencies

GnomAD3 genomes

AF:

0.000388

AC:

AN:

152230

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

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:

0.00316

Gnomad NFE

AF:

0.000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000467

AC:

115

AN:

246182

Hom.:

AF XY:

0.000513

AC XY:

AN XY:

132664

show subpopulations

Gnomad AFR exome

AF:

0.000316

Gnomad AMR exome

AF:

0.000351

Gnomad ASJ exome

AF:

0.000205

Gnomad EAS exome

AF:

0.000110

Gnomad SAS exome

AF:

0.000302

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000710

Gnomad OTH exome

AF:

0.00101

GnomAD4 exome

AF:

0.000527

AC:

769

AN:

1460128

Hom.:

Cov.:

AF XY:

0.000543

AC XY:

394

AN XY:

726088

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.000337

Gnomad4 ASJ exome

AF:

0.000116

Gnomad4 EAS exome

AF:

0.0000756

Gnomad4 SAS exome

AF:

0.000351

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000603

Gnomad4 OTH exome

AF:

0.000613

GnomAD4 genome

AF:

0.000387

AC:

AN:

152348

Hom.:

Cov.:

AF XY:

0.000268

AC XY:

AN XY:

74500

show subpopulations

Gnomad4 AFR

AF:

0.000120

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:

0.000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000640

Hom.:

Bravo

AF:

0.000370

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000412

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

RFT1-congenital disorder of glycosylation

Uncertain:5

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Sep 27, 2022	This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 444 of the RFT1 protein (p.Thr444Met). This variant is present in population databases (rs147740901, gnomAD 0.07%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with RFT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 547993). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt RFT1 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Sep 08, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 30, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 19, 2021

The c.1331C>T (p.T444M) alteration is located in exon 12 (coding exon 12) of the RFT1 gene. This alteration results from a C to T substitution at nucleotide position 1331, causing the threonine (T) at amino acid position 444 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Sep 04, 2020

Reported in the heterozygous state in a patient with central serous chorioretinopathy who also harbored several variants in other genes (Schellevis et al., 2019); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 30724488) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.24

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.16

T;T

Eigen

Benign

-0.32

Eigen_PC

Benign

-0.22

FATHMM_MKL

Benign

0.48

LIST_S2

Benign

0.83

T;T

M_CAP

Benign

0.051

MetaRNN

Benign

0.054

T;T

MetaSVM

Uncertain

-0.26

MutationAssessor

Benign

1.5

L;.

MutationTaster

Benign

0.98

D;D

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.39

N;N

REVEL

Benign

0.25

Sift

Benign

0.086

T;T

Sift4G

Benign

0.087

T;T

Polyphen

0.045

B;B

Vest4

0.41

MVP

0.81

MPC

0.14

ClinPred

0.0087

GERP RS

4.5

Varity_R

0.020

gMVP

0.34

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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