6-34767986-C-T

Position:

• chr6-34767986-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BS2

The NM_003093.3(SNRPC):​c.239C>T​(p.Pro80Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,460,048 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: SNRPC NM_003093.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.82

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]

SNRPC (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BS2: High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNRPC	NM_003093.3	c.239C>T	p.Pro80Leu	missense_variant	4/6	ENST00000244520.10	NP_003084.1
SNRPC	NR_029472.2	n.235C>T		non_coding_transcript_exon_variant	3/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNRPC	ENST00000244520.10	c.239C>T	p.Pro80Leu	missense_variant	4/6	1	NM_003093.3	ENSP00000244520.5
SNRPC	ENST00000374017.3	c.302C>T	p.Pro101Leu	missense_variant	3/5	2		ENSP00000363129.3
SNRPC	ENST00000374018.5	c.116C>T	p.Pro39Leu	missense_variant	3/5	5		ENSP00000363130.1
SNRPC	ENST00000474635.1	n.231C>T		non_coding_transcript_exon_variant	3/6	5

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1460048 Hom.: 0 Cov.: 35 AF XY: 0.00000413 AC XY: 3 AN XY: 726394

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: 0.00000450

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

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

Oct 06, 2021

The c.239C>T (p.P80L) alteration is located in exon 4 (coding exon 4) of the SNRPC gene. This alteration results from a C to T substitution at nucleotide position 239, causing the proline (P) at amino acid position 80 to be replaced by a leucine (L). 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	0.64
BayesDel_addAF	Benign	-0.067	T
BayesDel_noAF	Benign	-0.33
CADD	Uncertain	24
DANN	Benign	0.76
DEOGEN2	Benign	0.11	T;.;T
Eigen	Benign	0.083
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.88	D;D;D
M_CAP	Benign	0.0099	T
MetaRNN	Uncertain	0.44	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.6	L;.;.
PrimateAI	Pathogenic	0.80	D
PROVEAN	Uncertain	-3.7	D;D;D
REVEL	Benign	0.13
Sift	Benign	0.18	T;T;T
Sift4G	Benign	0.27	T;T;T
Polyphen		0.28	B;.;.
Vest4		0.62
MutPred		0.18		Loss of glycosylation at P80 (P = 0.003);.;.;
MVP		0.32
MPC		1.4
ClinPred		0.61	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.19
gMVP		0.81

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

LitVar

Other links and lift over

dbSNP: rs1764636014; hg19: chr6-34735763;