19-46746421-C-A

Variant names:

• chr19-46746421-C-A
• rs1470129629
• NM_013403.3:c.10G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_013403.3(STRN4):​c.10G>T​(p.Glu4*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: STRN4 NM_013403.3 stop_gained
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.362
• Publications: 1 publications found

Genes affected

STRN4 (HGNC:15721): (striatin 4) Enables armadillo repeat domain binding activity and protein phosphatase 2A binding activity. Part of FAR/SIN/STRIPAK complex. [provided by Alliance of Genome Resources, Apr 2022]

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STRN4	NM_013403.3	c.10G>T	p.Glu4*	stop_gained	Exon 1 of 18	ENST00000263280.11	NP_037535.2
FKRP	NM_024301.5	c.-253+331C>A		intron_variant	Intron 1 of 3	ENST00000318584.10	NP_077277.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STRN4	ENST00000263280.11	c.10G>T	p.Glu4*	stop_gained	Exon 1 of 18	1	NM_013403.3	ENSP00000263280.4
FKRP	ENST00000318584.10	c.-253+331C>A		intron_variant	Intron 1 of 3	1	NM_024301.5	ENSP00000326570.4

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 886848 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 414312

African (AFR) AF: 0.00 AC: 0 AN: 16910

American (AMR) AF: 0.00 AC: 0 AN: 2798

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 6628

East Asian (EAS) AF: 0.00 AC: 0 AN: 6308

South Asian (SAS) AF: 0.00 AC: 0 AN: 17558

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 5754

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1904

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 798420

Other (OTH) AF: 0.00 AC: 0 AN: 30568

GnomAD4 genome Cov.: 29

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Nov 30, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene or region of a gene for which loss of function is not a well-established mechanism of disease; Has not been previously published as pathogenic or benign to our knowledge; Variants in candidate genes are classified as variants of uncertain significance in accordance with ACMG guidelines (Richards et al., 2015) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	37
DANN	Uncertain	0.99
Eigen	Uncertain	0.32
Eigen_PC	Benign	-0.014
FATHMM_MKL	Benign	0.023	N
PhyloP100		0.36
Vest4		0.031
GERP RS		0.93
PromoterAI		-0.079	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Mutation Taster		=19/181	disease causing (fs/PTC)

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: rs1470129629; hg19: chr19-47249678;