rs143946953

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_018249.6(CDK5RAP2):c.4730C>T(p.Ala1577Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0012 in 1,609,356 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 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 0.00066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0013 ( 4 hom. )

Consequence

CDK5RAP2
NM_018249.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:1

Conservation

PhyloP100: 0.395

Publications

5 publications found

Variant links:

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

CDK5RAP2 links:

ENSG00000301087 (HGNC:):

ENSG00000301087 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.009485275).

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000657 (100/152262) while in subpopulation NFE AF = 0.00123 (84/68016). AF 95% confidence interval is 0.00102. There are 0 homozygotes in GnomAd4. There are 37 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check. 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 rank	MANE	Protein	UniProt
CDK5RAP2	NM_018249.6 link	c.4730C>T	p.Ala1577Val	missense_variant	Exon 32 of 38	ENST00000349780.9	NP_060719.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDK5RAP2	ENST00000349780.9 link	c.4730C>T	p.Ala1577Val	missense_variant	Exon 32 of 38	1	NM_018249.6	ENSP00000343818.4

Frequencies

GnomAD3 genomes

AF:

0.000664

AC:

101

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000943

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00123

Gnomad OTH

AF:

0.000479

GnomAD2 exomes

AF:

0.000688

AC:

171

AN:

248602

AF XY:

0.000735

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.000497

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000253

Gnomad NFE exome

AF:

0.00137

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00126

AC:

1829

AN:

1457094

Hom.:

Cov.:

AF XY:

0.00122

AC XY:

884

AN XY:

725200

show subpopulations

African (AFR)

AF:

0.000209

AC:

AN:

33422

American (AMR)

AF:

0.000112

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.000306

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39688

South Asian (SAS)

AF:

0.00

AC:

AN:

86202

European-Finnish (FIN)

AF:

0.000293

AC:

AN:

51224

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00157

AC:

1746

AN:

1109648

Other (OTH)

AF:

0.000796

AC:

AN:

60300

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

171

257

342

428

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

152

228

304

380

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000657

AC:

100

AN:

152262

Hom.:

Cov.:

AF XY:

0.000497

AC XY:

AN XY:

74444

show subpopulations

African (AFR)

AF:

0.000193

AC:

AN:

41558

American (AMR)

AF:

0.0000654

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00115

AC:

AN:

3470

East Asian (EAS)

AF:

0.000193

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.0000943

AC:

AN:

10602

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00123

AC:

AN:

68016

Other (OTH)

AF:

0.000474

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00111

Hom.:

Bravo

AF:

0.000593

TwinsUK

AF:

0.00162

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000930

AC:

ExAC

AF:

0.000791

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000981

EpiControl

AF:

0.000889

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Microcephaly 3, primary, autosomal recessive

Uncertain:2

Mar 21, 2023

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Aug 25, 2025

Daryl Scott Lab, Baylor College of Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BS1, BS2, PM3

not provided

Uncertain:1Benign:1

Oct 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1577 of the CDK5RAP2 protein (p.Ala1577Val). This variant is present in population databases (rs143946953, 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: 210638). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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.

Sep 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

CDK5RAP2: BP4

not specified

Uncertain:1

Jul 22, 2015

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Primary Microcephaly, Recessive

Uncertain:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.58

BayesDel_noAF

Benign

-0.64

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.0

.;T;.;.

Eigen

Benign

-0.70

Eigen_PC

Benign

-0.75

FATHMM_MKL

Benign

0.12

LIST_S2

Benign

0.74

T;T;T;T

M_CAP

Benign

0.0045

MetaRNN

Benign

0.0095

T;T;T;T

MetaSVM

Benign

-0.96

MutationAssessor

Benign

0.0

.;L;.;.

PhyloP100

0.40

PrimateAI

Benign

0.26

PROVEAN

Benign

0.0

.;N;N;N

REVEL

Benign

0.072

Sift

Pathogenic

0.0

.;D;D;D

Sift4G

Benign

0.079

T;T;T;T

Vest4

0.21

ClinPred

0.035

GERP RS

1.8

Varity_R

0.060

gMVP

0.086

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.17

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over