7-142751938-G-C

Position:

• chr7-142751938-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PM5

The NM_002769.5(PRSS1):​c.365G>C​(p.Arg122Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R122C) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 31)
• Consequence: PRSS1 NM_002769.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.140

Genes affected

PRSS1 (HGNC:9475): (serine protease 1) This gene encodes a trypsinogen, which is a member of the trypsin family of serine proteases. This enzyme is secreted by the pancreas and cleaved to its active form in the small intestine. It is active on peptide linkages involving the carboxyl group of lysine or arginine. Mutations in this gene are associated with hereditary pancreatitis. This gene and several other trypsinogen genes are localized to the T cell receptor beta locus on chromosome 7. [provided by RefSeq, Jul 2008]

PRSS1 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a strand (size 2) in uniprot entity TRY1_HUMAN there are 6 pathogenic changes around while only 0 benign (100%) in NM_002769.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr7-142751937-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PRSS1	NM_002769.5	c.365G>C	p.Arg122Pro	missense_variant	3/5	ENST00000311737.12	NP_002760.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PRSS1	ENST00000311737.12	c.365G>C	p.Arg122Pro	missense_variant	3/5	1	NM_002769.5	ENSP00000308720.7

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 62

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary pancreatitis Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 30, 2019

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant disrupts the p.Arg122 amino acid residue in PRSS1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 8841182, 19453252, 11748242, 11097832). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with PRSS1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces arginine with proline at codon 122 of the PRSS1 protein (p.Arg122Pro). The arginine residue is moderately conserved and there is a moderate physicochemical difference between arginine and proline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Benign	11
DANN	Benign	0.94
DEOGEN2	Uncertain	0.54	.;.;D;D
Eigen	Benign	-0.79
Eigen_PC	Benign	-0.96
FATHMM_MKL	Benign	0.057	N
M_CAP	Uncertain	0.18	D
MetaRNN	Uncertain	0.55	D;D;D;D
MetaSVM	Uncertain	-0.094	T
MutationAssessor	Benign	0.61	.;.;N;.
PrimateAI	Benign	0.25	T
PROVEAN	Uncertain	-2.7	D;.;D;D
REVEL	Uncertain	0.64
Sift	Benign	0.14	T;.;T;T
Sift4G	Benign	0.15	T;T;T;T
Polyphen		0.53	P;.;B;.
Vest4		0.50
MutPred		0.57		Loss of MoRF binding (P = 0.0145);.;.;.;
MVP		0.94
MPC		0.51
ClinPred		0.39	T
GERP RS		-0.75
Varity_R		0.82
gMVP		0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs111033565; hg19: chr7-142459789;