rs121918418

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_StrongPP5_Very_Strong

The NM_000171.4(GLRA1):c.971C>A(p.Ser324Ter) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000136 in 1,614,016 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. S324S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

GLRA1
NM_000171.4 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 9.72

Variant links:

Genes affected

GLRA1 (HGNC:4326): (glycine receptor alpha 1) The protein encoded by this gene is a subunit of a pentameric inhibitory glycine receptor, which mediates postsynaptic inhibition in the central nervous system. Defects in this gene are a cause of startle disease (STHE), also known as hereditary hyperekplexia or congenital stiff-person syndrome. Multiple transcript variants encoding different isoforms have been found. [provided by RefSeq, Dec 2015]

GLRA1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 9 pathogenic variants in the truncated region.

PP5

Variant 5-151829009-G-T is Pathogenic according to our data. Variant chr5-151829009-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 16073.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
GLRA1	NM_000171.4 linkuse as main transcript	c.971C>A	p.Ser324Ter	stop_gained	8/9	ENST00000274576.9
GLRA1	NM_001146040.2 linkuse as main transcript	c.971C>A	p.Ser324Ter	stop_gained	8/9
GLRA1	NM_001292000.2 linkuse as main transcript	c.722C>A	p.Ser241Ter	stop_gained	7/8
GLRA1	XM_047417105.1 linkuse as main transcript	c.1019C>A	p.Ser340Ter	stop_gained	8/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GLRA1	ENST00000274576.9 linkuse as main transcript	c.971C>A	p.Ser324Ter	stop_gained	8/9	1	NM_000171.4	P4	P23415-2
GLRA1	ENST00000455880.2 linkuse as main transcript	c.971C>A	p.Ser324Ter	stop_gained	8/9	1		A1	P23415-1
GLRA1	ENST00000462581.6 linkuse as main transcript	c.*729C>A		3_prime_UTR_variant, NMD_transcript_variant	7/8	1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152246

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1461770

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

727178

show subpopulations

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:

0.0000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152246

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000557

Hom.:

Bravo

AF:

0.0000151

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hyperekplexia 1

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 29, 2007

- -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Oct 12, 2018

The S324X nonsense variant in the GLRA1 gene has been reported previously (using S296X using alternative nomenclature) as a de novo change in an individual with hyperekplexia (Bellini et al., 2007). Functional studies demonstrated that S324X impairs protein function via a dominant negative effect (Bellini et al., 20017). This variant is not observed in large population cohorts (Lek et al., 2016). We interpret this variant as pathogenic. -

Hereditary hyperekplexia

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Mar 01, 2022

For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this premature translational stop signal affects GLRA1 function (PMID: 17536053). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. ClinVar contains an entry for this variant (Variation ID: 16073). This premature translational stop signal has been observed in individual(s) with hyperekplexia (PMID: 17536053). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Ser324*) in the GLRA1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 126 amino acid(s) of the GLRA1 protein. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.66

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.95

FATHMM_MKL

Pathogenic

0.99

MutationTaster

Benign

1.0

A;A;A

Vest4

0.74

GERP RS

5.1

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