rs141004029

Positions:

• chr9-120402961-G-C

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The NM_018249.6(CDK5RAP2):​c.5152C>G​(p.Leu1718Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000886 in 1,614,200 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00058 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00092 (4 hom.)
• Consequence: CDK5RAP2 NM_018249.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:1
• Conservation: PhyloP100: -0.00800

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.01521641).
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000584 (89/152326) while in subpopulation NFE AF= 0.00101 (69/68022). AF 95% confidence interval is 0.000821. There are 0 homozygotes in gnomad4. There are 42 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAdExome4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDK5RAP2	NM_018249.6	c.5152C>G	p.Leu1718Val	missense_variant	34/38	ENST00000349780.9	NP_060719.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDK5RAP2	ENST00000349780.9	c.5152C>G	p.Leu1718Val	missense_variant	34/38	1	NM_018249.6	ENSP00000343818.4

Frequencies

GnomAD3 genomes AF: 0.000585 AC: 89 AN: 152208 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000145

Gnomad AMI AF: 0.00329

Gnomad AMR AF: 0.000523

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000622

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00101

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000799 AC: 201 AN: 251428 Hom.: 0 AF XY: 0.000890 AC XY: 121 AN XY: 135880

Gnomad AFR exome AF: 0.000308

Gnomad AMR exome AF: 0.000607

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00124

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00116

Gnomad OTH exome AF: 0.000815

GnomAD4 exome AF: 0.000917 AC: 1341 AN: 1461874 Hom.: 4 Cov.: 31 AF XY: 0.000960 AC XY: 698 AN XY: 727240

Gnomad4 AFR exome AF: 0.000119

Gnomad4 AMR exome AF: 0.000470

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00147

Gnomad4 FIN exome AF: 0.0000374

Gnomad4 NFE exome AF: 0.00102

Gnomad4 OTH exome AF: 0.000679

GnomAD4 genome AF: 0.000584 AC: 89 AN: 152326 Hom.: 0 Cov.: 32 AF XY: 0.000564 AC XY: 42 AN XY: 74486

Gnomad4 AFR AF: 0.000144

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000622

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00101

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000989 Hom.: 0

Bravo AF: 0.000631

TwinsUK AF: 0.00135 AC: 5

ALSPAC AF: 0.00104 AC: 4

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000930 AC: 8

ExAC AF: 0.000972 AC: 118

Asia WGS AF: 0.000866 AC: 3 AN: 3478

EpiCase AF: 0.000818

EpiControl AF: 0.00130

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Microcephaly 3, primary, autosomal recessive Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Uncertain significance, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	Nov 16, 2021	DNA sequence analysis of the CDK5RAP2 gene demonstrated a sequence change, c.5152C>G, in exon 34 that results in an amino acid change, p.Leu1718Val. This sequence change has been described in the gnomAD database with a frequency of 0.12%in the South Asian subpopulation (dbSNP rs141004029). The p.Leu1718Val change affects a moderately conserved amino acid residue located in a domain of the CDK5RAP2 protein that is not known to be functional. In-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL) provide contradictory results for the p.Leu1718Val substitution. This sequence change does not appear to have been previously described in individuals with CDK5RAP2-related disorders. Due to insufficient evidences and the lack of functional studies, the clinical significance of the p.Leu1718Val change remains unknown at this time. -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Sep 08, 2017	- -

not provided Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2024	CDK5RAP2: BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 22, 2022	This sequence change replaces leucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1718 of the CDK5RAP2 protein (p.Leu1718Val). This variant is present in population databases (rs141004029, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with CDK5RAP2-related conditions. ClinVar contains an entry for this variant (Variation ID: 158156). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 02, 2023

The c.5152C>G (p.L1718V) alteration is located in exon 34 (coding exon 34) of the CDK5RAP2 gene. This alteration results from a C to G substitution at nucleotide position 5152, causing the leucine (L) at amino acid position 1718 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.51	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	6.4
DANN	Benign	0.71
DEOGEN2	Benign	0.13	.;T;.;.;.
Eigen	Benign	-0.95
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.81	T;T;T;T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.015	T;T;T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.7	.;L;.;.;.
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-1.2	.;N;N;N;N
REVEL	Benign	0.069
Sift	Uncertain	0.019	.;D;D;D;T
Sift4G	Uncertain	0.038	D;D;D;D;T
Polyphen		0.0020, 0.20, 0.016, 0.015	.;B;B;B;B
Vest4		0.23
MVP		0.26
MPC		0.076
ClinPred		0.0035	T
GERP RS		-4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.027
gMVP		0.10

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: rs141004029; hg19: chr9-123165239;