chr6-34770302-C-T

Variant names:

• chr6-34770302-C-T
• NM_003093.3:c.262C>T

Variant summary

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

The NM_003093.3(SNRPC):​c.262C>T​(p.Arg88Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000000686 in 1,458,414 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SNRPC NM_003093.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.82

Genes affected

SNRPC (HGNC:11157): (small nuclear ribonucleoprotein polypeptide C) This gene encodes one of the specific protein components of the U1 small nuclear ribonucleoprotein (snRNP) particle required for the formation of the spliceosome. The encoded protein participates in the processing of nuclear precursor messenger RNA splicing. snRNP particles are attacked by autoantibodies frequently produced by patients with connective tissue diseases. The genome contains several pseudogenes of this functional gene. Alternative splicing results in a non-coding transcript variant.[provided by RefSeq, Oct 2009]

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 rank	MANE	Protein	UniProt
SNRPC	NM_003093.3	c.262C>T	p.Arg88Cys	missense_variant	Exon 5 of 6	ENST00000244520.10	NP_003084.1
SNRPC	NR_029472.2	n.258C>T		non_coding_transcript_exon_variant	Exon 4 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNRPC	ENST00000244520.10	c.262C>T	p.Arg88Cys	missense_variant	Exon 5 of 6	1	NM_003093.3	ENSP00000244520.5
SNRPC	ENST00000374017.3	c.325C>T	p.Arg109Cys	missense_variant	Exon 4 of 5	2		ENSP00000363129.3
SNRPC	ENST00000374018.5	c.139C>T	p.Arg47Cys	missense_variant	Exon 4 of 5	5		ENSP00000363130.1
SNRPC	ENST00000474635.1	n.254C>T		non_coding_transcript_exon_variant	Exon 4 of 6	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1458414 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 725836

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: 9.02e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 04, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.262C>T (p.R88C) alteration is located in exon 5 (coding exon 5) of the SNRPC gene. This alteration results from a C to T substitution at nucleotide position 262, causing the arginine (R) at amino acid position 88 to be replaced by a cysteine (C). 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	0.68
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.013	T;.;T
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.80	T;T;T
M_CAP	Benign	0.044	D
MetaRNN	Uncertain	0.51	D;D;D
MetaSVM	Benign	-0.49	T
MutationAssessor	Uncertain	2.3	M;.;.
PrimateAI	Pathogenic	0.90	D
PROVEAN	Benign	-2.3	N;D;N
REVEL	Benign	0.26
Sift	Uncertain	0.029	D;D;D
Sift4G	Benign	0.19	T;T;T
Polyphen		1.0	D;.;.
Vest4		0.64
MutPred		0.32		Loss of methylation at R88 (P = 0.0262);.;.;
MVP		0.49
MPC		1.7
ClinPred		0.92	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.25
gMVP		0.75

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: chr6-34738079; COSMIC: COSV55075880;