19-40759474-T-C

Position:

• chr19-40759474-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004596.5(SNRPA):​c.290T>C​(p.Met97Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,842 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SNRPA NM_004596.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.02

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNRPA	NM_004596.5	c.290T>C	p.Met97Thr	missense_variant	3/6	ENST00000243563.8	NP_004587.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNRPA	ENST00000243563.8	c.290T>C	p.Met97Thr	missense_variant	3/6	1	NM_004596.5	ENSP00000243563	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461842 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727218

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 19, 2023

The c.290T>C (p.M97T) alteration is located in exon 3 (coding exon 3) of the SNRPA gene. This alteration results from a T to C substitution at nucleotide position 290, causing the methionine (M) at amino acid position 97 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Uncertain	24
DANN	Benign	0.96
DEOGEN2	Benign	0.17	.;T;.;T;.;.
Eigen	Uncertain	0.33
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;D
M_CAP	Benign	0.058	D
MetaRNN	Uncertain	0.52	D;D;D;D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.8	.;M;.;.;.;.
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.94	D
PROVEAN	Benign	-2.0	.;N;.;.;.;.
REVEL	Benign	0.20
Sift	Benign	0.20	.;T;.;.;.;.
Sift4G	Uncertain	0.031	D;T;T;T;T;T
Polyphen		0.19	.;B;.;.;.;.
Vest4		0.83
MutPred		0.38		.;Gain of methylation at K96 (P = 0.0258);.;Gain of methylation at K96 (P = 0.0258);Gain of methylation at K96 (P = 0.0258);.;
MVP		0.61
MPC		0.82
ClinPred		0.82	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.72
gMVP		0.55

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-41265379;