chr19-46746180-G-A

Position:

• chr19-46746180-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_013403.3(STRN4):​c.251C>T​(p.Ala84Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000722 in 1,385,734 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. A84T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: STRN4 NM_013403.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.01

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.32897192).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STRN4	NM_013403.3	c.251C>T	p.Ala84Val	missense_variant	1/18	ENST00000263280.11
FKRP	NM_024301.5	c.-253+90G>A		intron_variant		ENST00000318584.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STRN4	ENST00000263280.11	c.251C>T	p.Ala84Val	missense_variant	1/18	1	NM_013403.3	P4
FKRP	ENST00000318584.10	c.-253+90G>A		intron_variant		1	NM_024301.5	P1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 7.22e-7 AC: 1 AN: 1385734 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 688362

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: 9.24e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 25, 2022

The c.251C>T (p.A84V) alteration is located in exon 1 (coding exon 1) of the STRN4 gene. This alteration results from a C to T substitution at nucleotide position 251, causing the alanine (A) at amino acid position 84 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.25	T;.
Eigen	Benign	0.061
Eigen_PC	Benign	0.024
FATHMM_MKL	Benign	0.37	N
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.88	D
MetaRNN	Benign	0.33	T;T
MetaSVM	Benign	-0.39	T
MutationAssessor	Benign	1.5	L;L
MutationTaster	Benign	1.0	D;D;D;D;N;N
PrimateAI	Pathogenic	0.89	D
PROVEAN	Benign	-2.3	N;N
REVEL	Benign	0.14
Sift	Uncertain	0.0050	D;D
Sift4G	Uncertain	0.016	D;D
Polyphen		0.61	P;.
Vest4		0.16
MutPred		0.46		Gain of relative solvent accessibility (P = 0.0479);Gain of relative solvent accessibility (P = 0.0479);
MVP		0.50
MPC		0.42
ClinPred		0.87	D
GERP RS		3.3
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.0
Varity_R		0.25
gMVP		0.23

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-47249437;