rs41277797

Variant names:

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP6BS1BS2

The NM_001079802.2(FKTN):c.166C>T(p.Arg56Cys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0219 in 1,558,772 control chromosomes in the GnomAD database, including 484 homozygotes. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R56H) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.020 ( 50 hom., cov: 32)

Exomes 𝑓: 0.022 ( 434 hom. )

Consequence

FKTN
NM_001079802.2 missense, splice_region

Scores

Splicing: ADA: 0.9959

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:16

Conservation

PhyloP100: 2.54

Variant links:

Genes affected

FKTN (HGNC:3622): (fukutin) The protein encoded by this gene is a putative transmembrane protein that is localized to the cis-Golgi compartment, where it may be involved in the glycosylation of alpha-dystroglycan in skeletal muscle. The encoded protein is thought to be a glycosyltransferase and could play a role in brain development. Defects in this gene are a cause of Fukuyama-type congenital muscular dystrophy (FCMD), Walker-Warburg syndrome (WWS), limb-girdle muscular dystrophy type 2M (LGMD2M), and dilated cardiomyopathy type 1X (CMD1X). Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Nov 2010]

FKTN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP6

Variant 9-105601145-C-T is Benign according to our data. Variant chr9-105601145-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 93517.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Benign=11}. Variant chr9-105601145-C-T is described in Lovd as [Likely_benign]. Variant chr9-105601145-C-T is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.0204 (3111/152214) while in subpopulation AMR AF= 0.037 (566/15280). AF 95% confidence interval is 0.0345. There are 50 homozygotes in gnomad4. There are 1508 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 50 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FKTN	NM_001079802.2 link	c.166C>T	p.Arg56Cys	missense_variant, splice_region_variant	Exon 5 of 11	ENST00000357998.10	NP_001073270.1	O75072-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FKTN	ENST00000357998.10 link	c.166C>T	p.Arg56Cys	missense_variant, splice_region_variant	Exon 5 of 11	5	NM_001079802.2	ENSP00000350687.6		O75072-1

Frequencies

GnomAD3 genomes

AF:

0.0204

AC:

3109

AN:

152096

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00509

Gnomad AMI

AF:

0.0274

Gnomad AMR

AF:

0.0371

Gnomad ASJ

AF:

0.0167

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00249

Gnomad FIN

AF:

0.0291

Gnomad MID

AF:

0.0253

Gnomad NFE

AF:

0.0275

Gnomad OTH

AF:

0.0259

GnomAD3 exomes

AF:

0.0189

AC:

4629

AN:

244618

Hom.:

AF XY:

0.0189

AC XY:

2505

AN XY:

132384

show subpopulations

Gnomad AFR exome

AF:

0.00432

Gnomad AMR exome

AF:

0.0158

Gnomad ASJ exome

AF:

0.0173

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00319

Gnomad FIN exome

AF:

0.0313

Gnomad NFE exome

AF:

0.0269

Gnomad OTH exome

AF:

0.0238

GnomAD4 exome

AF:

0.0220

AC:

30956

AN:

1406558

Hom.:

434

Cov.:

AF XY:

0.0218

AC XY:

15322

AN XY:

702764

show subpopulations

Gnomad4 AFR exome

AF:

0.00379

Gnomad4 AMR exome

AF:

0.0181

Gnomad4 ASJ exome

AF:

0.0157

Gnomad4 EAS exome

AF:

0.0000254

Gnomad4 SAS exome

AF:

0.00319

Gnomad4 FIN exome

AF:

0.0308

Gnomad4 NFE exome

AF:

0.0248

Gnomad4 OTH exome

AF:

0.0222

GnomAD4 genome

AF:

0.0204

AC:

3111

AN:

152214

Hom.:

Cov.:

AF XY:

0.0203

AC XY:

1508

AN XY:

74408

show subpopulations

Gnomad4 AFR

AF:

0.00508

Gnomad4 AMR

AF:

0.0370

Gnomad4 ASJ

AF:

0.0167

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00269

Gnomad4 FIN

AF:

0.0291

Gnomad4 NFE

AF:

0.0275

Gnomad4 OTH

AF:

0.0256

Alfa

AF:

0.0244

Hom.:

103

Bravo

AF:

0.0205

TwinsUK

AF:

0.0262

AC:

ALSPAC

AF:

0.0259

AC:

100

ESP6500AA

AF:

0.00568

AC:

ESP6500EA

AF:

0.0283

AC:

243

ExAC

AF:

0.0179

AC:

2166

Asia WGS

AF:

0.00607

AC:

AN:

3472

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:16

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:7

Likely benign, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	-	Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 08, 2014	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Nov 18, 2014	- -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 03, 2016	p.Arg56Cys in exon 5 of FKTN: This variant is not expected to have clinical sign ificance because it has been identified in 3.7% (1650/44834) of European chromos omes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs41277797). -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 02, 2017	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -

not provided

Benign:3

Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 19, 2024	- -

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A, 4

Benign:2

Benign, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	May 18, 2021	- -

Walker-Warburg congenital muscular dystrophy

Benign:2

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Jun 04, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 03, 2025	- -

Dilated cardiomyopathy 1X

Uncertain:1

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. -

Muscular dystrophy-dystroglycanopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Molecular Genetics, Royal Melbourne Hospital

May 05, 2023

- -

Cardiovascular phenotype

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 10, 2015

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Uncertain

-0.070

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.29

T;T;.;.

Eigen

Uncertain

0.53

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.95

.;D;.;D

MetaRNN

Benign

0.0066

T;T;T;T

MetaSVM

Uncertain

0.18

MutationAssessor

Benign

1.9

L;L;L;L

PrimateAI

Benign

0.25

PROVEAN

Benign

-2.0

.;N;D;N

REVEL

Uncertain

0.41

Sift

Benign

0.047

.;D;D;T

Sift4G

Benign

0.17

T;T;T;T

Polyphen

1.0

D;D;.;.

Vest4

0.33

MPC

0.21

ClinPred

0.024

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.13

gMVP

0.56

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.83

SpliceAI score (max)

0.010

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