rs765885747

Variant names:

• chr19-46756378-G-A
• rs765885747
• NM_024301.5:c.928G>A

Your query was ambiguous. Multiple possible variants found:

• chr19-46756378-G-A
• chr19-46756378-G-C
• chr19-46756378-G-T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_024301.5(FKRP):​c.928G>A​(p.Glu310Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000283 in 1,411,748 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E310Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: FKRP NM_024301.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.518
• Publications: 5 publications found

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 Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy type 2I

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Laboratory for Molecular Medicine, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A5

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Genomics England PanelApp, G2P, Ambry Genetics
• muscular dystrophy-dystroglycanopathy type B5

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Myriad Women’s Health, Labcorp Genetics (formerly Invitae)
• myopathy caused by variation in FKRP

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• congenital muscular dystrophy with cerebellar involvement

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• congenital muscular dystrophy with intellectual disability

  Inheritance: AR 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM1: In a hotspot region, there are 12 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 12 uncertain in NM_024301.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 46 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 1.8498 (below the threshold of 3.09). Trascript score misZ: -2.4986 (below the threshold of 3.09). GenCC associations: The gene is linked to autosomal recessive limb-girdle muscular dystrophy type 2I, muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A5, congenital muscular dystrophy with intellectual disability, muscular dystrophy-dystroglycanopathy, type A, muscle-eye-brain disease, congenital muscular dystrophy with cerebellar involvement, myopathy caused by variation in FKRP, muscular dystrophy-dystroglycanopathy type B5, congenital muscular dystrophy without intellectual disability.
• BP4: Computational evidence support a benign effect (MetaRNN=0.29970276).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FKRP	NM_024301.5	c.928G>A	p.Glu310Lys	missense_variant	Exon 4 of 4	ENST00000318584.10	NP_077277.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FKRP	ENST00000318584.10	c.928G>A	p.Glu310Lys	missense_variant	Exon 4 of 4	1	NM_024301.5	ENSP00000326570.4
FKRP	ENST00000391909.7	c.928G>A	p.Glu310Lys	missense_variant	Exon 4 of 4	2		ENSP00000375776.2
FKRP	ENST00000597339.5	n.247-5455G>A		intron_variant	Intron 3 of 3	5
FKRP	ENST00000600646.5	n.247+7713G>A		intron_variant	Intron 3 of 3	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000283 AC: 4 AN: 1411748 Hom.: 0 Cov.: 32 AF XY: 0.00000143 AC XY: 1 AN XY: 697914

African (AFR) AF: 0.00 AC: 0 AN: 32574

American (AMR) AF: 0.00 AC: 0 AN: 36972

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25188

East Asian (EAS) AF: 0.00 AC: 0 AN: 37190

South Asian (SAS) AF: 0.00 AC: 0 AN: 80464

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47140

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5560

European-Non Finnish (NFE) AF: 0.00000368 AC: 4 AN: 1088118

Other (OTH) AF: 0.00 AC: 0 AN: 58542

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Jul 02, 2019

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Walker-Warburg congenital muscular dystrophy Uncertain:1

Aug 15, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 310 of the FKRP protein (p.Glu310Lys). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FKRP-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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	0.19
BayesDel_addAF	Benign	0.011	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	18
DANN	Uncertain	0.98
DEOGEN2	Benign	0.20	T;T
Eigen	Benign	-0.26
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.67	D
LIST_S2	Uncertain	0.92	.;D
M_CAP	Pathogenic	0.44	D
MetaRNN	Benign	0.30	T;T
MetaSVM	Uncertain	-0.13	T
MutationAssessor	Benign	1.0	L;L
PhyloP100		0.52
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-0.19	N;N
REVEL	Benign	0.27
Sift	Benign	0.40	T;T
Sift4G	Benign	0.54	T;T
Polyphen		0.52	P;P
Vest4		0.22
MutPred		0.37		Gain of methylation at E310 (P = 0.0231);Gain of methylation at E310 (P = 0.0231);
MVP		0.92
MPC		0.77
ClinPred		0.36	T
GERP RS		4.2
Varity_R		0.21
gMVP		0.76
Mutation Taster		=93/7	polymorphism

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

Other links and lift over

dbSNP: rs765885747; hg19: chr19-47259635;