rs763422045

Positions:

chr19-46756847-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PM2

The NM_024301.5(FKRP):c.1397G>A(p.Arg466His) variant causes a missense change. The variant allele was found at a frequency of 0.00000374 in 1,603,552 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

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

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

FKRP
NM_024301.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 4.30

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 Uncertain_significance. Variant got 4 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_024301.5

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FKRP	NM_024301.5 linkuse as main transcript	c.1397G>A	p.Arg466His	missense_variant	4/4	ENST00000318584.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
FKRP	ENST00000318584.10 linkuse as main transcript	c.1397G>A	p.Arg466His	missense_variant	4/4	1	NM_024301.5	P1
FKRP	ENST00000391909.7 linkuse as main transcript	c.1397G>A	p.Arg466His	missense_variant	4/4	2		P1
FKRP	ENST00000597339.5 linkuse as main transcript	n.247-4986G>A		intron_variant, non_coding_transcript_variant		5
FKRP	ENST00000600646.5 linkuse as main transcript	n.247+8182G>A		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000132

AC:

AN:

227058

Hom.:

AF XY:

0.0000161

AC XY:

AN XY:

124234

show subpopulations

Gnomad AFR exome

AF:

0.000151

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:

0.00000996

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000276

AC:

AN:

1451358

Hom.:

Cov.:

AF XY:

0.00000277

AC XY:

AN XY:

721172

show subpopulations

Gnomad4 AFR exome

AF:

0.0000901

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:

9.03e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152194

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.0000482

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.00000826

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2I

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Feb 07, 2020

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jul 17, 2017

- -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 09, 2022

The p.R466H variant (also known as c.1397G>A), located in coding exon 1 of the FKRP gene, results from a G to A substitution at nucleotide position 1397. The arginine at codon 466 is replaced by histidine, an amino acid with highly similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Walker-Warburg congenital muscular dystrophy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 05, 2022

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 466 of the FKRP protein (p.Arg466His). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with FKRP-related conditions. ClinVar contains an entry for this variant (Variation ID: 571231). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Pathogenic

0.19

BayesDel_noAF

Uncertain

0.030

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.70

D;D

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.92

.;D

M_CAP

Pathogenic

0.37

MetaRNN

Uncertain

0.58

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

1.6

L;L

MutationTaster

Benign

0.99

D;D

PrimateAI

Uncertain

0.67

PROVEAN

Uncertain

-2.6

D;D

REVEL

Pathogenic

0.70

Sift

Uncertain

0.011

D;D

Sift4G

Uncertain

0.024

D;D

Polyphen

1.0

D;D

Vest4

0.39

MutPred

0.53

Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);

MVP

0.99

MPC

1.7

ClinPred

0.71

GERP RS

5.4

Varity_R

0.20

gMVP

0.67

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