chr5-151855144-C-G

Variant names:

• chr5-151855144-C-G
• rs202247813
• NM_000171.4:c.593G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_000171.4(GLRA1):​c.593G>C​(p.Trp198Ser) variant causes a missense change involving the alteration of a 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 (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GLRA1 NM_000171.4 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1 O:1
• Conservation: PhyloP100: 7.70
• Publications: 3 publications found

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

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.993

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GLRA1	NM_000171.4	c.593G>C	p.Trp198Ser	missense_variant	Exon 6 of 9	ENST00000274576.9	NP_000162.2
GLRA1	NM_001146040.2	c.593G>C	p.Trp198Ser	missense_variant	Exon 6 of 9		NP_001139512.1
GLRA1	NM_001292000.2	c.344G>C	p.Trp115Ser	missense_variant	Exon 5 of 8		NP_001278929.1
GLRA1	XM_047417105.1	c.641G>C	p.Trp214Ser	missense_variant	Exon 6 of 9		XP_047273061.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GLRA1	ENST00000274576.9	c.593G>C	p.Trp198Ser	missense_variant	Exon 6 of 9	1	NM_000171.4	ENSP00000274576.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1 Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Hyperekplexia 1 Uncertain:1 Other:1

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ClinVar Staff, National Center for Biotechnology Information (NCBI)

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Dec 30, 2017

Department Of Genetics, Sultan Qaboos University Hospital, Sultan Qaboos University

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: curation

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	34
DANN	Uncertain	0.99
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.62	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Pathogenic	3.4	M;M
PhyloP100		7.7
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-13	D;D
REVEL	Pathogenic	0.91
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.98
MutPred		0.90		Gain of disorder (P = 0.0056);Gain of disorder (P = 0.0056);
MVP		0.95
MPC		2.6
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.93
gMVP		0.96
Mutation Taster		=0/100	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.30		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.30		Position offset: -5

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs202247813; hg19: chr5-151234705;