rs104894692

Positions:

chr19-46756369-T-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PP3_StrongPP5_Very_Strong

The ENST00000318584.10(FKRP):c.919T>A(p.Tyr307Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000576 in 1,562,032 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y307C) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000050 ( 0 hom. )

Consequence

FKRP
ENST00000318584.10 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8O:1

Conservation

PhyloP100: 5.67

Variant links:

Genes affected

FKRP (HGNC:17997): (fukutin related protein) This gene encodes a protein which is targeted to the medial Golgi apparatus and is necessary for posttranslational modification of dystroglycan. Mutations in this gene have been associated with congenital muscular dystrophy, cognitive disability, and cerebellar cysts. Several alternatively spliced transcript variants of this gene have been described, but the full-length nature of some of these variants has not been determined. [provided by RefSeq, Oct 2008]

FKRP links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1

In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in ENST00000318584.10

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.989

PP5

Variant 19-46756369-T-A is Pathogenic according to our data. Variant chr19-46756369-T-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 4233.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-46756369-T-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FKRP	NM_024301.5 linkuse as main transcript	c.919T>A	p.Tyr307Asn	missense_variant	4/4	ENST00000318584.10	NP_077277.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
FKRP	ENST00000318584.10 linkuse as main transcript	c.919T>A	p.Tyr307Asn	missense_variant	4/4	1	NM_024301.5	ENSP00000326570	P1
FKRP	ENST00000391909.7 linkuse as main transcript	c.919T>A	p.Tyr307Asn	missense_variant	4/4	2		ENSP00000375776	P1
FKRP	ENST00000597339.5 linkuse as main transcript	n.247-5464T>A		intron_variant, non_coding_transcript_variant		5
FKRP	ENST00000600646.5 linkuse as main transcript	n.247+7704T>A		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152020

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000632

AC:

AN:

158156

Hom.:

AF XY:

0.00

AC XY:

AN XY:

86676

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:

0.0000162

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000496

AC:

AN:

1410012

Hom.:

Cov.:

AF XY:

0.00000287

AC XY:

AN XY:

697032

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

0.00000644

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152020

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74258

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000264

ExAC

AF:

0.0000180

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2I

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Aug 02, 2017	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	May 01, 2004	- -

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A5

Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	May 01, 2004	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 14, 2024	- -

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	May 01, 2023	FKRP: PM3:Very Strong, PM2, PM5, PP3, PS3:Supporting -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 19, 2016	The Y307N variant in the FKRP gene has previously been reported in the homozygous state, as well as the compound heterozygous state, in association with FKRP-related disorders (Mercuri et al., 2003; Beltran-Valero de Bernabe et al., 2004; Sveen et al., 2006). In addition, missense variants in nearby residues (P305S, Y309C, R312C) have been reported in the Human Gene Mutation Database in association with FKRP-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. The Y307N variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. This substitution occurs at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. Additionally, the Y307N variant was not observed in approximately 5,400 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. Therefore, the Y307N variant is a strong candidate for a pathogenic variant, however the possibility it may be a rare benign variant cannot be excluded. -

Autosomal recessive limb-girdle muscular dystrophy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

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

Dec 18, 2023

Variant summary: FKRP c.919T>A (p.Tyr307Asn) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 6.3e-06 in 158156 control chromosomes. c.919T>A has been reported in the literature in multiple individuals affected with muscle-eye-brain disease, including at-least two homozygous cases (examples, Beltran-Valero de Bernabe_2004, Mercuri_2006). These data indicate that the variant is likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function. The homozygote FKRP-Neo mice knocking in the current variant results in a reduction in the laminin-binding epitope of alpha-dystroglycan in muscle, eye and brain, reduced levels of FKRP transcript and a muscle eye brain phenotype mimicking FKRP-related diseases in human (Ackroyd_2009). Four submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. The following publications have been ascertained in the context of this evaluation (PMID: 19155270, 15121789, 16476814). All submitters classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Walker-Warburg congenital muscular dystrophy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

This sequence change replaces tyrosine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 307 of the FKRP protein (p.Tyr307Asn). This variant is present in population databases (rs104894692, gnomAD 0.002%). This missense change has been observed in individuals with FKRP-related conditions (PMID: 12666124, 15121789, 16476814, 16634037, 18639457). ClinVar contains an entry for this variant (Variation ID: 4233). 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 expected to disrupt FKRP protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects FKRP function (PMID: 19155270, 26923585). For these reasons, this variant has been classified as Pathogenic. -

FKRP-related disorder

Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

Variant interpretted as Likely pathogenic and reported on 05/09/2016 by GTR ID 26957. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.34

BayesDel_noAF

Pathogenic

0.26

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Pathogenic

0.90

D;D

Eigen

Uncertain

0.39

Eigen_PC

Uncertain

0.27

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.90

.;D

M_CAP

Pathogenic

0.89

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.0

M;M

MutationTaster

Benign

1.0

A;A

PrimateAI

Pathogenic

0.81

PROVEAN

Pathogenic

-7.7

D;D

REVEL

Pathogenic

0.85

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;D

Vest4

0.95

MutPred

0.84

Loss of helix (P = 0.028);Loss of helix (P = 0.028);

MVP

0.99

MPC

2.1

ClinPred

0.98

GERP RS

3.1

Varity_R

0.95

gMVP

0.98

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