2-173358836-C-T

Variant names:

• chr2-173358836-C-T
• rs758866134
• NM_031942.5:c.146C>T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_031942.5(CDCA7):​c.146C>T​(p.Thr49Met) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.0000178 in 1,459,844 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000018 (0 hom.)
• Consequence: CDCA7 NM_031942.5 missense, splice_region
• Scores: Splicing: ADA: 0.9956
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.12

Genes affected

CDCA7 (HGNC:14628): (cell division cycle associated 7) This gene was identified as a c-Myc responsive gene, and behaves as a direct c-Myc target gene. Overexpression of this gene is found to enhance the transformation of lymphoblastoid cells, and it complements a transformation-defective Myc Box II mutant, suggesting its involvement in c-Myc-mediated cell transformation. Two alternatively spliced transcript variants encoding distinct isoforms have been reported. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDCA7	NM_031942.5	c.146C>T	p.Thr49Met	missense_variant, splice_region_variant	Exon 2 of 10	ENST00000306721.8	NP_114148.3
CDCA7	NM_145810.3	c.146C>T	p.Thr49Met	missense_variant, splice_region_variant	Exon 2 of 9		NP_665809.1
CDCA7	XM_047445957.1	c.146C>T	p.Thr49Met	missense_variant, splice_region_variant	Exon 2 of 6		XP_047301913.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDCA7	ENST00000306721.8	c.146C>T	p.Thr49Met	missense_variant, splice_region_variant	Exon 2 of 10	2	NM_031942.5	ENSP00000306968.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000178 AC: 26 AN: 1459844 Hom.: 0 Cov.: 31 AF XY: 0.0000207 AC XY: 15 AN XY: 725956

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000198

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.00 AC: 0

EpiCase AF: 0.0000546

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Dec 11, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 49 of the CDCA7 protein (p.Thr49Met). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CDCA7-related conditions. ClinVar contains an entry for this variant (Variation ID: 1519406). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Uncertain	0.017	T
BayesDel_noAF	Benign	-0.21
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Benign	0.080	T;.;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.59	T;D;D
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.29	T;T;T
MetaSVM	Benign	-0.66	T
MutationAssessor	Uncertain	2.5	M;M;M
PrimateAI	Uncertain	0.74	T
PROVEAN	Benign	-1.3	N;N;N
REVEL	Uncertain	0.38
Sift	Benign	0.46	T;D;T
Sift4G	Benign	0.12	T;D;T
Polyphen		1.0	D;D;.
Vest4		0.49
MutPred		0.19		Gain of helix (P = 0.0199);Gain of helix (P = 0.0199);Gain of helix (P = 0.0199);
MVP		0.64
MPC		1.1
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.13
gMVP		0.28

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.81
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: rs758866134; hg19: chr2-174223564;