NM_001079802.2:c.869A>T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_001079802.2(FKTN):c.869A>T(p.Lys290Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000508 in 1,613,936 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000051 ( 0 hom. )

Consequence

FKTN
NM_001079802.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:4

Conservation

PhyloP100: 0.812

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

autosomal recessive limb-girdle muscular dystrophy type 2M
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P
muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A, 4
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, G2P
myopathy caused by variation in FKTN
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
familial isolated dilated cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy without intellectual disability
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
muscle-eye-brain disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
muscular dystrophy-dystroglycanopathy, type A
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
dilated cardiomyopathy 1X
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

FKTN links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.03138444).

BP6

Variant 9-105615366-A-T is Benign according to our data. Variant chr9-105615366-A-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 265152.We mark this variant Likely_benign, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FKTN	NM_001079802.2 link	c.869A>T	p.Lys290Ile	missense_variant	Exon 8 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.869A>T	p.Lys290Ile	missense_variant	Exon 8 of 11	5	NM_001079802.2	ENSP00000350687.6		O75072-1

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

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:

0.00

GnomAD2 exomes

AF:

0.000258

AC:

AN:

251468

AF XY:

0.000206

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00188

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000506

AC:

AN:

1461750

Hom.:

Cov.:

AF XY:

0.0000440

AC XY:

AN XY:

727196

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00165

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111892

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152186

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74370

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41448

American (AMR)

AF:

0.000524

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68028

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.000125

ExAC

AF:

0.000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Jun 12, 2017

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:provider interpretation

p.Lys290Ile (c.869A>T) in the FKTN gene (NM_001079802.1) GeneDx classifies this variant as a variant of uncertain significance. Given its prevalence in the general population we consider this variant a variant of uncertain significance, likely benign and we do not feel it is suitable for assessing risk in healthy relatives ("predictive genetic testing"). In addition, two pathogenic variants in the FKTN gene must be present for an individual to manifest symptoms. The FKTN gene encodes the fukutin protein, in which two loss of function variants (autosomal recessive inheritance) causes a severe muscular dystrophy. Autosomal recessive inheritance of both loss-of-function and pathogenic missense variants can cause a severe dilated cardiomyopathy that tends to onset in childhood. In a paper by Arimura et al (2009), 1 out of 172 DCM patients was a compound heterozygote for a deletion and missense variant (p.Cys101Phe in the FKTN gene. This was a 19 year old Japanese patient with a high CK and symptoms of DCM, accompanied by a reduced ejection fraction. Two other DCM patients and 3 controls were heterozygous for the insertion allele demonstrating that a single pathogenic variant is not enough to cause severe disease. Murakami et al (2006) identified compound heterozygous pathogenic variants in 6 individuals from 4 families with dilated cardiomyopathy and no signs of muscular dystrophy: one patient died at 12 years old and another required transplant at 18. There is no published literature to indicate that this variant is associated with cardiomyopathy. There is no published literature showing that a single variant predisposes an individual to cardiovascular disease. This variant is present in ClinVar. It has been submitted by two labs: GeneDx and Invitae, both of which classify this variant as a variant of uncertain significnace. Invitae saw this variant in a patient with Walker-Warburg congential muscular dystrophy. Per the test report, "in silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function". The lysine at codon 290 is not conserved across species, nor are neighboring amino acids. There are few variants at nearby codons listed in ClinVar. The variant was reported online in 68 of 138,611 individuals in the Genome Aggregation Consortium Dataset (gnomAD; http://gnomad.broadinstitute.org/), which currently includes variant calls on >140,000 unrelated individuals of African, Asian, European, Ashkenazi, Latino descent. Specifically, the variant was observed in 67 of 17,210 individuals of Latino descent (MAF=0.2%) and 1 of 3,234 individuals of "other" descent. Another variant at this codon, p.Lys290Glu is present in 1 out of 123,125 individuals. The phenotype of those individuals is not publicly available. The dataset is comprised of multiple cohorts, some of which were recruited from the general population, others were enriched for common cardiovascular disease. -

Oct 28, 2019

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 27332903) -

not specified

Uncertain:1

Mar 14, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: FKTN c.869A>T (p.Lys290Ile) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00026 in 251468 control chromosomes, predominantly at a frequency of 0.0019 within the Latino subpopulation in the gnomAD database. This frequency is not significantly higher than estimated for a pathogenic variant in FKTN causing Dilated Cardiomyopathy (0.00026 vs 0.004), allowing no conclusion about variant significance. c.869A>T has been reported in the literature in at least one case of sudden cardiac death without evidence for causailty (e.g. Bagnall_2016). These report(s) do not provide unequivocal conclusions about association of the variant with Dilated Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 27332903). ClinVar contains an entry for this variant (Variation ID: 265152). Based on the evidence outlined above, the variant was classified as uncertain significance. -

FKTN-related disorder

Benign:1

Apr 17, 2023

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

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). -

Hypertrophic cardiomyopathy

Benign:1

Feb 05, 2019

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Cardiovascular phenotype

Benign:1

Jan 24, 2024

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely 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. -

Walker-Warburg congenital muscular dystrophy

Benign:1

Jan 15, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Uncertain

-0.030

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.64

D;D;.;.

Eigen

Benign

-0.46

Eigen_PC

Benign

-0.41

FATHMM_MKL

Benign

0.093

LIST_S2

Uncertain

0.89

.;D;.;D

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.031

T;T;T;T

MetaSVM

Uncertain

-0.0016

MutationAssessor

Uncertain

2.8

M;M;M;M

PhyloP100

0.81

PrimateAI

Benign

0.30

PROVEAN

Uncertain

-2.9

.;D;.;D

REVEL

Uncertain

0.30

Sift

Benign

0.10

.;T;.;T

Sift4G

Benign

0.17

T;T;T;T

Polyphen

0.017

B;B;.;.

Vest4

0.41

MutPred

0.40

Loss of ubiquitination at K290 (P = 0.0255);Loss of ubiquitination at K290 (P = 0.0255);Loss of ubiquitination at K290 (P = 0.0255);Loss of ubiquitination at K290 (P = 0.0255);

MVP

0.81

MPC

0.20

ClinPred

0.11

GERP RS

3.8

Varity_R

0.21

gMVP

0.58

Mutation Taster

=90/10

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

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

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NM_001079802.2:c.869A>T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over