chr1-193249750-T-G

Position:

• chr1-193249750-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_024529.5(CDC73):​c.1438T>G​(p.Tyr480Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 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. Y480C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDC73 NM_024529.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.79

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]

CDC73 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.884

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDC73	NM_024529.5	c.1438T>G	p.Tyr480Asp	missense_variant	16/17	ENST00000367435.5	NP_078805.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDC73	ENST00000367435.5	c.1438T>G	p.Tyr480Asp	missense_variant	16/17	1	NM_024529.5	ENSP00000356405.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

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

Aug 02, 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CDC73 protein function. ClinVar contains an entry for this variant (Variation ID: 462748). 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 tyrosine, which is neutral and polar, with aspartic acid, which is acidic and polar, at codon 480 of the CDC73 protein (p.Tyr480Asp). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 14, 2023

The p.Y480D variant (also known as c.1438T>G), located in coding exon 16 of the CDC73 gene, results from a T to G substitution at nucleotide position 1438. The tyrosine at codon 480 is replaced by aspartic acid, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be deleterious by in silico analysis. 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	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.83	D;D;T
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.91	.;D;D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.88	D;D;D
MetaSVM	Uncertain	0.12	D
MutationAssessor	Uncertain	2.1	M;M;.
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-6.8	.;D;.
REVEL	Pathogenic	0.84
Sift	Uncertain	0.0050	.;D;.
Sift4G	Pathogenic	0.0010	.;D;.
Polyphen		1.0	D;D;.
Vest4		0.90
MutPred		0.73		Loss of sheet (P = 0.0037);Loss of sheet (P = 0.0037);.;
MVP		0.92
MPC		3.0
ClinPred		0.99	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.93
gMVP		0.99

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: rs1553292962; hg19: chr1-193218880;