15-40624495-G-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_144508.5(KNL1):c.4231G>A(p.Gly1411Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000178 in 1,613,620 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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 0.00095 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000098 ( 0 hom. )

Consequence

KNL1
NM_144508.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:1

Conservation

PhyloP100: 0.455

Publications

1 publications found

Variant links:

Genes affected

KNL1 (HGNC:24054): (kinetochore scaffold 1) The protein encoded by this gene is a component of the multiprotein assembly that is required for creation of kinetochore-microtubule attachments and chromosome segregation. The encoded protein functions as a scaffold for proteins that influence the spindle assembly checkpoint during the eukaryotic cell cycle and it interacts with at least five different kinetochore proteins and two checkpoint kinases. In adults, this gene is predominantly expressed in normal testes, various cancer cell lines and primary tumors from other tissues and is ubiquitously expressed in fetal tissues. This gene was originally identified as a fusion partner with the mixed-lineage leukemia (MLL) gene in t(11;15)(q23;q14). Mutations in this gene cause autosomal recessive primary microcephaly-4 (MCPH4). Alternative splicing results in multiple transcript variants encoding different isoforms. Additional splice variants have been described but their biological validity has not been confirmed. [provided by RefSeq, Jan 2013]

KNL1 Gene-Disease associations (from GenCC):

microcephaly 4, primary, autosomal recessive
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
autosomal recessive primary microcephaly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

KNL1 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=0.008064032).

BP6

Variant 15-40624495-G-A is Benign according to our data. Variant chr15-40624495-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 434582.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000946 (144/152216) while in subpopulation AFR AF = 0.00332 (138/41534). AF 95% confidence interval is 0.00287. There are 0 homozygotes in GnomAd4. There are 68 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_144508.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KNL1	NM_144508.5	MANE Select	c.4231G>A	p.Gly1411Arg	missense	Exon 10 of 26	NP_653091.3	Q8NG31-2
	KNL1	NM_170589.5		c.4309G>A	p.Gly1437Arg	missense	Exon 11 of 27	NP_733468.3	Q8NG31-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
KNL1	ENST00000399668.7	TSL:1 MANE Select	c.4231G>A	p.Gly1411Arg	missense	Exon 10 of 26	ENSP00000382576.3	Q8NG31-2
KNL1	ENST00000346991.9	TSL:1	c.4309G>A	p.Gly1437Arg	missense	Exon 11 of 27	ENSP00000335463.6	Q8NG31-1
KNL1	ENST00000526913.5	TSL:1	n.1363G>A		non_coding_transcript_exon	Exon 1 of 18	ENSP00000432565.1	H0YCZ2

Frequencies

GnomAD3 genomes

AF:

0.000927

AC:

141

AN:

152098

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00326

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000958

GnomAD2 exomes

AF:

0.000237

AC:

AN:

248894

AF XY:

0.000155

show subpopulations

Gnomad AFR exome

AF:

0.00362

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000885

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.0000979

AC:

143

AN:

1461404

Hom.:

Cov.:

AF XY:

0.0000922

AC XY:

AN XY:

726988

show subpopulations

African (AFR)

AF:

0.00368

AC:

123

AN:

33466

American (AMR)

AF:

0.0000895

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39680

South Asian (SAS)

AF:

0.00

AC:

AN:

86244

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53202

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00000270

AC:

AN:

1111832

Other (OTH)

AF:

0.000215

AC:

AN:

60382

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

Exome 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

GnomAD4 genome

AF:

0.000946

AC:

144

AN:

152216

Hom.:

Cov.:

AF XY:

0.000914

AC XY:

AN XY:

74434

show subpopulations

African (AFR)

AF:

0.00332

AC:

138

AN:

41534

American (AMR)

AF:

0.000262

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10602

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67994

Other (OTH)

AF:

0.000948

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.493

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:

0.000276

Hom.:

Bravo

AF:

0.00107

ESP6500AA

AF:

0.00435

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000348

AC:

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Microcephaly 4, primary, autosomal recessive (1)

not provided (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.50

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.22

Eigen

Benign

-0.52

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.15

LIST_S2

Benign

0.65

M_CAP

Benign

0.0051

MetaRNN

Benign

0.0081

MetaSVM

Benign

-0.99

PhyloP100

0.46

PrimateAI

Benign

0.37

PROVEAN

Uncertain

-3.1

REVEL

Benign

0.052

Sift

Uncertain

0.018

Sift4G

Uncertain

0.0040

Polyphen

0.020

Vest4

0.23

MutPred

0.38

Gain of MoRF binding (P = 0.013)

MVP

0.31

MPC

0.051

ClinPred

0.028

GERP RS

2.4

Varity_R

0.088

gMVP

0.14

Mutation Taster

=96/4

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over