1-193203838-C-G

Position:

• chr1-193203838-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_024529.5(CDC73):​c.1016C>G​(p.Pro339Arg) variant causes a missense change. 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. P339L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CDC73 NM_024529.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.29

Genes affected

CDC73 (HGNC:16783): (cell division cycle 73) This gene encodes a tumor suppressor that is involved in transcriptional and post-transcriptional control pathways. The protein is a component of the the PAF protein complex, which associates with the RNA polymerase II subunit POLR2A and with a histone methyltransferase complex. This protein appears to facilitate the association of 3' mRNA processing factors with actively-transcribed chromatin. Mutations in this gene have been linked to hyperparathyroidism-jaw tumor syndrome, familial isolated hyperparathyroidism, and parathyroid carcinoma. [provided by RefSeq, Jul 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CDC73. . Gene score misZ 3.7315 (greater than the threshold 3.09). Trascript score misZ 3.3639 (greater than threshold 3.09). GenCC has associacion of gene with parathyroid gland carcinoma, familial isolated hyperparathyroidism, hyperparathyroidism 2 with jaw tumors, hyperparathyroidism 1.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDC73	NM_024529.5	c.1016C>G	p.Pro339Arg	missense_variant	11/17	ENST00000367435.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDC73	ENST00000367435.5	c.1016C>G	p.Pro339Arg	missense_variant	11/17	1	NM_024529.5	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Parathyroid carcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 07, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CDC73 protein function. ClinVar contains an entry for this variant (Variation ID: 403890). This variant has not been reported in the literature in individuals affected with CDC73-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 339 of the CDC73 protein (p.Pro339Arg). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 19, 2020

The p.P339R variant (also known as c.1016C>G), located in coding exon 11 of the CDC73 gene, results from a C to G substitution at nucleotide position 1016. The proline at codon 339 is replaced by arginine, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.55
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.39	T;T;T
Eigen	Uncertain	0.19
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	.;D;D
M_CAP	Benign	0.050	D
MetaRNN	Uncertain	0.53	D;D;D
MetaSVM	Benign	-0.29	T
MutationAssessor	Uncertain	2.0	M;M;.
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-2.8	.;D;.
REVEL	Uncertain	0.42
Sift	Benign	0.041	.;D;.
Sift4G	Uncertain	0.049	.;D;.
Polyphen		0.033	B;B;.
Vest4		0.38
MutPred		0.55		Gain of MoRF binding (P = 7e-04);Gain of MoRF binding (P = 7e-04);.;
MVP		0.86
MPC		1.3
ClinPred		0.65	D
GERP RS		6.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.31
gMVP		0.64

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1060500018; hg19: chr1-193172968;