rs1555775208

Variant names:

• chr19-40757356-T-C
• rs1555775208
• NM_004596.5:c.98T>C

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3 PP5_Moderate

The NM_004596.5(SNRPA):​c.98T>C​(p.Ile33Thr) 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 Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I33V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 30)
• Consequence: SNRPA NM_004596.5 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.82
• Publications: 0 publications found

Genes affected

SNRPA (HGNC:11151): (small nuclear ribonucleoprotein polypeptide A) The protein encoded by this gene associates with stem loop II of the U1 small nuclear ribonucleoprotein, which binds the 5' splice site of precursor mRNAs and is required for splicing. The encoded protein autoregulates itself by polyadenylation inhibition of its own pre-mRNA via dimerization and has been implicated in the coupling of splicing and polyadenylation. [provided by RefSeq, Oct 2010]

SNRPA Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.772
• PP5: Variant 19-40757356-T-C is Pathogenic according to our data. Variant chr19-40757356-T-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 446220.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004596.5. 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
	SNRPA	NM_004596.5	MANE Select	c.98T>C	p.Ile33Thr	missense	Exon 2 of 6	NP_004587.1	P09012

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNRPA	ENST00000243563.8	TSL:1 MANE Select	c.98T>C	p.Ile33Thr	missense	Exon 2 of 6	ENSP00000243563.2	P09012
	SNRPA	ENST00000925562.1		c.98T>C	p.Ile33Thr	missense	Exon 2 of 7	ENSP00000595621.1
	SNRPA	ENST00000861888.1		c.191T>C	p.Ile64Thr	missense	Exon 3 of 7	ENSP00000531947.1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 30

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Spliceosomepathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.29	T
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.061	D
MetaRNN	Pathogenic	0.77	D
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	1.4	L
PhyloP100		7.8
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.50
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.057	T
Polyphen		0.13	B
Vest4		0.81
MutPred		0.77		Loss of stability (P = 0.0026)
MVP		0.63
MPC		1.4
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.85
gMVP		0.59
Mutation Taster		=6/94	disease causing (ClinVar)

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: rs1555775208; hg19: chr19-41263261;