2-127420008-T-C

Position:

• chr2-127420008-T-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_000312.4(PROC):​c.66T>C​(p.Pro22=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000625 in 1,613,240 control chromosomes in the GnomAD database, including 22 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0013 (7 hom., cov: 33)
  • Exomes 𝑓: 0.00056 (15 hom.)
• Consequence: PROC NM_000312.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 1.31

Genes affected

PROC (HGNC:9451): (protein C, inactivator of coagulation factors Va and VIIIa) This gene encodes a vitamin K-dependent plasma glycoprotein. The encoded protein is cleaved to its activated form by the thrombin-thrombomodulin complex. This activated form contains a serine protease domain and functions in degradation of the activated forms of coagulation factors V and VIII. Mutations in this gene have been associated with thrombophilia due to protein C deficiency, neonatal purpura fulminans, and recurrent venous thrombosis.[provided by RefSeq, Dec 2009]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 2-127420008-T-C is Benign according to our data. Variant chr2-127420008-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 331102.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=1.31 with no splicing effect.
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.00127 (193/152220) while in subpopulation EAS AF= 0.0273 (141/5166). AF 95% confidence interval is 0.0236. There are 7 homozygotes in gnomad4. There are 104 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 7 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PROC	NM_000312.4	c.66T>C	p.Pro22=	synonymous_variant	2/9	ENST00000234071.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PROC	ENST00000234071.8	c.66T>C	p.Pro22=	synonymous_variant	2/9	1	NM_000312.4	P1

Frequencies

GnomAD3 genomes AF: 0.00128 AC: 194 AN: 152102 Hom.: 7 Cov.: 33

Gnomad AFR AF: 0.000700

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0274

Gnomad SAS AF: 0.00290

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.00213 AC: 536 AN: 251228 Hom.: 11 AF XY: 0.00194 AC XY: 263 AN XY: 135854

Gnomad AFR exome AF: 0.000369

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0261

Gnomad SAS exome AF: 0.00111

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00179

GnomAD4 exome AF: 0.000559 AC: 816 AN: 1461020 Hom.: 15 Cov.: 34 AF XY: 0.000532 AC XY: 387 AN XY: 726820

Gnomad4 AFR exome AF: 0.000299

Gnomad4 AMR exome AF: 0.000112

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0134

Gnomad4 SAS exome AF: 0.000986

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000126

Gnomad4 OTH exome AF: 0.00282

GnomAD4 genome AF: 0.00127 AC: 193 AN: 152220 Hom.: 7 Cov.: 33 AF XY: 0.00140 AC XY: 104 AN XY: 74422

Gnomad4 AFR AF: 0.000698

Gnomad4 AMR AF: 0.000196

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.0273

Gnomad4 SAS AF: 0.00290

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.000211 Hom.: 1

Bravo AF: 0.000933

Asia WGS AF: 0.0200 AC: 69 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Thrombophilia due to protein C deficiency, autosomal dominant Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 20, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

not provided Benign:1

Likely benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

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- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	4.5
DANN	Benign	0.59

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs144300387; hg19: chr2-128177584;