chr12-4299924-G-C

Variant names:

• chr12-4299924-G-C
• rs142170178
• NM_001759.4:c.785G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001759.4(CCND2):​c.785G>C​(p.Arg262Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R262H) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CCND2 NM_001759.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.10
• Publications: 0 publications found

Genes affected

CCND2 (HGNC:1583): (cyclin D2) The protein encoded by this gene belongs to the highly conserved cyclin family, whose members are characterized by a dramatic periodicity in protein abundance through the cell cycle. Cyclins function as regulators of CDK kinases. Different cyclins exhibit distinct expression and degradation patterns which contribute to the temporal coordination of each mitotic event. This cyclin forms a complex with CDK4 or CDK6 and functions as a regulatory subunit of the complex, whose activity is required for cell cycle G1/S transition. This protein has been shown to interact with and be involved in the phosphorylation of tumor suppressor protein Rb. Knockout studies of the homologous gene in mouse suggest the essential roles of this gene in ovarian granulosa and germ cell proliferation. High level expression of this gene was observed in ovarian and testicular tumors. Mutations in this gene are associated with megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 3 (MPPH3). [provided by RefSeq, Sep 2014]

CCND2 Gene-Disease associations (from GenCC):

• megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 3

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000285901 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19717276).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001759.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCND2	NM_001759.4	MANE Select	c.785G>C	p.Arg262Pro	missense	Exon 5 of 5	NP_001750.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCND2	ENST00000261254.8	TSL:1 MANE Select	c.785G>C	p.Arg262Pro	missense	Exon 5 of 5	ENSP00000261254.3
	ENSG00000285901	ENST00000674624.1		n.720+10934G>C		intron	N/A	ENSP00000501898.1
	CCND2	ENST00000675880.1		c.827G>C	p.Arg276Pro	missense	Exon 6 of 6	ENSP00000502508.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.096	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.28	T
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.29
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.64	T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.20	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.9	L
PhyloP100		3.1
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-0.23	N
REVEL	Benign	0.17
Sift	Benign	0.35	T
Sift4G	Benign	0.35	T
Polyphen		0.0010	B
Vest4		0.16
MutPred		0.69		Loss of helix (P = 0.0558)
MVP		0.58
MPC		1.4
ClinPred		0.62	D
GERP RS		3.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.21
gMVP		0.74
Mutation Taster		=73/27	polymorphism

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

Other links and lift over

dbSNP: rs142170178; hg19: chr12-4409090;