NM_000171.4:c.1295T>C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP4

The NM_000171.4(GLRA1):c.1295T>C(p.Met432Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000496 in 1,613,770 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. M432I) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

GLRA1
NM_000171.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 7.36

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

hyperekplexia 1
Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
hereditary hyperekplexia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GLRA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.32682127).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GLRA1	NM_000171.4 link	c.1295T>C	p.Met432Thr	missense_variant	Exon 9 of 9	ENST00000274576.9	NP_000162.2	P23415-2
GLRA1	NM_001146040.2 link	c.1319T>C	p.Met440Thr	missense_variant	Exon 9 of 9		NP_001139512.1	P23415-1
GLRA1	NM_001292000.2 link	c.1046T>C	p.Met349Thr	missense_variant	Exon 8 of 8		NP_001278929.1	Q14C71
GLRA1	XM_047417105.1 link	c.1343T>C	p.Met448Thr	missense_variant	Exon 9 of 9		XP_047273061.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GLRA1	ENST00000274576.9 link	c.1295T>C	p.Met432Thr	missense_variant	Exon 9 of 9	1	NM_000171.4	ENSP00000274576.5	P23415-2
GLRA1	ENST00000455880.2 link	c.1319T>C	p.Met440Thr	missense_variant	Exon 9 of 9	1		ENSP00000411593.2	P23415-1
GLRA1	ENST00000462581.6 link	n.*1053T>C		non_coding_transcript_exon_variant	Exon 8 of 8	1		ENSP00000430595.1	E5RJ70
GLRA1	ENST00000462581.6 link	n.*1053T>C		3_prime_UTR_variant	Exon 8 of 8	1		ENSP00000430595.1	E5RJ70

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152134

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251298

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461636

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727136

show subpopulations

African (AFR)

AF:

0.0000598

AC:

AN:

33466

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111802

Other (OTH)

AF:

0.00

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152134

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74300

show subpopulations

African (AFR)

AF:

0.000121

AC:

AN:

41430

American (AMR)

AF:

0.00

AC:

AN:

15270

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68028

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.415

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000453

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 11, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: GLRA1 c.1295T>C (p.Met432Thr) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 251298 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.1295T>C in individuals affected with Hyperekplexia 1 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 532839). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Hyperekplexia 1

Uncertain:1

Apr 29, 2021

New York Genome Center

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Uncertain:1

Mar 20, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1295T>C (p.M432T) alteration is located in exon 9 (coding exon 9) of the GLRA1 gene. This alteration results from a T to C substitution at nucleotide position 1295, causing the methionine (M) at amino acid position 432 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Hereditary hyperekplexia

Uncertain:1

Nov 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces methionine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 432 of the GLRA1 protein (p.Met432Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with GLRA1-related conditions. ClinVar contains an entry for this variant (Variation ID: 532839). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt GLRA1 protein function with a negative predictive value of 80%. 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

0.12

BayesDel_addAF

Uncertain

0.083

BayesDel_noAF

Benign

-0.12

CADD

Uncertain

(source)

DANN

Uncertain

0.98

Eigen

Benign

-0.066

Eigen_PC

Benign

0.15

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.79

T;T

M_CAP

Benign

0.042

MetaRNN

Benign

0.33

T;T

MetaSVM

Benign

-0.39

MutationAssessor

Benign

1.6

.;L

PhyloP100

7.4

PrimateAI

Uncertain

0.68

PROVEAN

Benign

-2.3

N;N

REVEL

Uncertain

0.52

Sift

Uncertain

0.017

D;D

Sift4G

Uncertain

0.045

D;D

Polyphen

0.13

B;B

Vest4

0.36

MutPred

0.66

.;Loss of stability (P = 0.0808);

MVP

0.81

MPC

0.054

ClinPred

0.72

GERP RS

5.0

Varity_R

0.46

gMVP

0.77

Mutation Taster

=34/66

disease causing

(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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NM_000171.4:c.1295T>C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over