dbSNP rs140679502: FKRP:p.Val393Ile (chr19-46756627-G-A) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_024301.5(FKRP):c.1177G>A(p.Val393Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000339 in 1,612,960 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 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. V393L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0018 ( 2 hom., cov: 33)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

FKRP
NM_024301.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:9

Conservation

PhyloP100: 7.69

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

autosomal recessive limb-girdle muscular dystrophy type 2I
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Ambry Genetics
muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A5
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Genomics England PanelApp, Ambry Genetics
muscular dystrophy-dystroglycanopathy type B5
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Myriad Women’s Health
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

FKRP links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

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=0.010372072).

BP6

Variant 19-46756627-G-A is Benign according to our data. Variant chr19-46756627-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 137380.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00184 (280/152306) while in subpopulation AFR AF = 0.00664 (276/41566). AF 95% confidence interval is 0.006. There are 2 homozygotes in GnomAd4. There are 125 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024301.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FKRP	NM_024301.5	MANE Select	c.1177G>A	p.Val393Ile	missense	Exon 4 of 4	NP_077277.1	Q9H9S5
	FKRP	NM_001039885.3		c.1177G>A	p.Val393Ile	missense	Exon 4 of 4	NP_001034974.1	Q9H9S5

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
FKRP	ENST00000318584.10	TSL:1 MANE Select	c.1177G>A	p.Val393Ile	missense	Exon 4 of 4	ENSP00000326570.4	Q9H9S5
FKRP	ENST00000391909.7	TSL:2	c.1177G>A	p.Val393Ile	missense	Exon 4 of 4	ENSP00000375776.2	Q9H9S5
FKRP	ENST00000908841.1		c.1177G>A	p.Val393Ile	missense	Exon 3 of 3	ENSP00000578900.1

Frequencies

GnomAD3 genomes

AF:

0.00181

AC:

276

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00656

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000487

AC:

120

AN:

246164

AF XY:

0.000314

show subpopulations

Gnomad AFR exome

AF:

0.00730

Gnomad AMR exome

AF:

0.000146

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:

0.000182

AC:

266

AN:

1460654

Hom.:

Cov.:

AF XY:

0.000154

AC XY:

112

AN XY:

726588

show subpopulations

African (AFR)

AF:

0.00699

AC:

234

AN:

33472

American (AMR)

AF:

0.000157

AC:

AN:

44502

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26072

East Asian (EAS)

AF:

0.00

AC:

AN:

39674

South Asian (SAS)

AF:

0.00

AC:

AN:

86050

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53114

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111674

Other (OTH)

AF:

0.000332

AC:

AN:

60328

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

101

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00184

AC:

280

AN:

152306

Hom.:

Cov.:

AF XY:

0.00168

AC XY:

125

AN XY:

74464

show subpopulations

African (AFR)

AF:

0.00664

AC:

276

AN:

41566

American (AMR)

AF:

0.000131

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68028

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000499

Hom.:

Bravo

AF:

0.00209

ESP6500AA

AF:

0.00726

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000569

AC:

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (5)

not provided (4)

Autosomal recessive limb-girdle muscular dystrophy type 2I (2)

Cardiovascular phenotype (1)

FKRP-related disorder (1)

Walker-Warburg congenital muscular dystrophy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Uncertain

-0.030

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.28

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.60

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.87

M_CAP

Pathogenic

0.34

MetaRNN

Benign

0.010

MetaSVM

Pathogenic

0.91

MutationAssessor

Benign

1.9

PhyloP100

7.7

PrimateAI

Uncertain

0.70

PROVEAN

Benign

-0.51

REVEL

Pathogenic

0.66

Sift

Uncertain

0.023

Sift4G

Benign

0.087

Polyphen

1.0

Vest4

0.27

MVP

0.98

MPC

1.5

ClinPred

0.059

GERP RS

5.0

Varity_R

0.26

gMVP

0.56

Mutation Taster

=95/5

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over