chr7-73708672-C-G

Variant names:

• chr7-73708672-C-G
• rs1554617455
• NM_004603.4:c.125G>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_004603.4(STX1A):​c.125G>C​(p.Gly42Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,718 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: STX1A NM_004603.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.70
• Publications: 0 publications found

Genes affected

STX1A (HGNC:11433): (syntaxin 1A) This gene encodes a member of the syntaxin superfamily. Syntaxins are nervous system-specific proteins implicated in the docking of synaptic vesicles with the presynaptic plasma membrane. Syntaxins possess a single C-terminal transmembrane domain, a SNARE [Soluble NSF (N-ethylmaleimide-sensitive fusion protein)-Attachment protein REceptor] domain (known as H3), and an N-terminal regulatory domain (Habc). Syntaxins bind synaptotagmin in a calcium-dependent fashion and interact with voltage dependent calcium and potassium channels via the C-terminal H3 domain. This gene product is a key molecule in ion channel regulation and synaptic exocytosis. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Sep 2009]

STX1A Gene-Disease associations (from GenCC):

• neurodevelopmental disorder

  Inheritance: AR, AD Classification: STRONG, LIMITED Submitted by: PanelApp Australia, G2P
• complex neurodevelopmental disorder

  Inheritance: AD Classification: MODERATE Submitted by: G2P
• cystic fibrosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 3 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 2.3989 (below the threshold of 3.09). Trascript score misZ: 2.9044 (below the threshold of 3.09). GenCC associations: The gene is linked to cystic fibrosis, complex neurodevelopmental disorder, neurodevelopmental disorder.
• BP4: Computational evidence support a benign effect (MetaRNN=0.22816604).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004603.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STX1A	NM_004603.4	MANE Select	c.125G>C	p.Gly42Ala	missense	Exon 3 of 10	NP_004594.1	Q75ME0
	STX1A	NM_001165903.2		c.125G>C	p.Gly42Ala	missense	Exon 3 of 10	NP_001159375.1	Q16623-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STX1A	ENST00000222812.8	TSL:1 MANE Select	c.125G>C	p.Gly42Ala	missense	Exon 3 of 10	ENSP00000222812.3	Q16623-1
	STX1A	ENST00000395156.7	TSL:1	c.125G>C	p.Gly42Ala	missense	Exon 3 of 10	ENSP00000378585.3	Q16623-3
	STX1A	ENST00000929307.1		c.125G>C	p.Gly42Ala	missense	Exon 3 of 11	ENSP00000599366.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250742 AF XY: 0.00000738

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: 0.00

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461718 Hom.: 0 Cov.: 35 AF XY: 0.00000138 AC XY: 1 AN XY: 727142

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86206

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53378

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111962

Other (OTH) AF: 0.00 AC: 0 AN: 60390

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Uncertain	25
DANN	Benign	0.95
DEOGEN2	Benign	0.36	T
Eigen	Benign	-0.21
Eigen_PC	Benign	-0.043
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.92	D
M_CAP	Benign	0.0068	T
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L
PhyloP100		2.7
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.094
Sift	Benign	0.42	T
Sift4G	Benign	0.65	T
Polyphen		0.0010	B
Vest4		0.41
MutPred		0.51		Loss of ubiquitination at K46 (P = 0.0589)
MVP		0.46
MPC		1.2
ClinPred		0.32	T
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.14
gMVP		0.38
Mutation Taster		=22/78	disease causing

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: rs1554617455; hg19: chr7-73123002;