9-120437481-G-T

Variant names:

• chr9-120437481-G-T
• rs185208659
• NM_018249.6:c.3769C>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_018249.6(CDK5RAP2):​c.3769C>A​(p.Arg1257Arg) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDK5RAP2 NM_018249.6 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.60
• Publications: 5 publications found

Genes affected

CDK5RAP2 (HGNC:18672): (CDK5 regulatory subunit associated protein 2) This gene encodes a regulator of CDK5 (cyclin-dependent kinase 5) activity. The protein encoded by this gene is localized to the centrosome and Golgi complex, interacts with CDK5R1 and pericentrin (PCNT), plays a role in centriole engagement and microtubule nucleation, and has been linked to primary microcephaly and Alzheimer's disease. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2013]

CDK5RAP2 Gene-Disease associations (from GenCC):

• autosomal recessive primary microcephaly

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• microcephaly 3, primary, autosomal recessive

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• corpus callosum, agenesis of

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.42).
• BP7: Synonymous conserved (PhyloP=1.6 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018249.6. 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
	CDK5RAP2	NM_018249.6	MANE Select	c.3769C>A	p.Arg1257Arg	synonymous	Exon 25 of 38	NP_060719.4
	CDK5RAP2	NM_001410994.1		c.3766C>A	p.Arg1256Arg	synonymous	Exon 25 of 38	NP_001397923.1
	CDK5RAP2	NM_001410993.1		c.3673C>A	p.Arg1225Arg	synonymous	Exon 24 of 37	NP_001397922.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDK5RAP2	ENST00000349780.9	TSL:1 MANE Select	c.3769C>A	p.Arg1257Arg	synonymous	Exon 25 of 38	ENSP00000343818.4
	CDK5RAP2	ENST00000360190.8	TSL:1	c.3769C>A	p.Arg1257Arg	synonymous	Exon 25 of 37	ENSP00000353317.4
	CDK5RAP2	ENST00000473282.6	TSL:1	n.*2593C>A		non_coding_transcript_exon	Exon 26 of 39	ENSP00000419265.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000151

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.42
CADD	Benign	9.2
DANN	Benign	0.86
PhyloP100		1.6

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

Other links and lift over

dbSNP: rs185208659; hg19: chr9-123199759;