rs768152581

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4BP6

The NM_015443.4(KANSL1):c.19G>A(p.Ala7Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000106 in 1,605,934 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A7P) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 35)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

KANSL1
NM_015443.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 7.36

Publications

4 publications found

Variant links:

Genes affected

KANSL1 (HGNC:24565): (KAT8 regulatory NSL complex subunit 1) This gene encodes a nuclear protein that is a subunit of two protein complexes involved with histone acetylation, the MLL1 complex and the NSL1 complex. The encoded protein has been implicated in a variety of cellular processes including enhancer regulation, cell proliferation, and mitosis. Mutations in this gene are associated with Koolen-de Vries Syndrome. [provided by RefSeq, May 2022]

KANSL1 Gene-Disease associations (from GenCC):

Koolen-de Vries syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), ClinGen
Koolen-de Vries syndrome due to a point mutation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

KANSL1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.38825476).

BP6

Variant 17-46172125-C-T is Benign according to our data. Variant chr17-46172125-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 205802.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KANSL1	NM_015443.4 link	c.19G>A	p.Ala7Thr	missense_variant	Exon 2 of 15	ENST00000432791.7	NP_056258.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KANSL1	ENST00000432791.7 link	c.19G>A	p.Ala7Thr	missense_variant	Exon 2 of 15	1	NM_015443.4	ENSP00000387393.3

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

GnomAD2 exomes

AF:

0.0000123

AC:

AN:

244754

AF XY:

0.0000151

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000545

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000110

AC:

AN:

1453732

Hom.:

Cov.:

AF XY:

0.0000111

AC XY:

AN XY:

723452

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33448

American (AMR)

AF:

0.00

AC:

AN:

44698

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.000176

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86226

European-Finnish (FIN)

AF:

0.00

AC:

AN:

46030

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5268

European-Non Finnish (NFE)

AF:

0.00000719

AC:

AN:

1111938

Other (OTH)

AF:

0.0000166

AC:

AN:

60290

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000222789), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.394

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:

0.00000657

AC:

AN:

152202

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74360

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41448

American (AMR)

AF:

0.00

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10610

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68042

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Koolen-de Vries syndrome

Uncertain:1Benign:1

Aug 10, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 08, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Mar 17, 2014

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is denoted p.Ala7Thr (GCT>ACT): c.19 G>A in exon 2 of the KANSL1 gene (NM_001193466.1). The A7T variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The A7T variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function; however missense mutations associated with KANSL1-related disorders have not been reported in this region of the protein. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic mutation or a rare benign variant. The variant is found in INFANT-EPI panel(s). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.95

BayesDel_addAF

Benign

-0.0039

BayesDel_noAF

Uncertain

-0.070

CADD

Pathogenic

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.12

.;.;.;.;.;.;.;.;T;.

Eigen

Pathogenic

0.75

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.95

.;.;.;.;D;D;D;D;D;.

M_CAP

Benign

0.025

MetaRNN

Benign

0.39

T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.95

PhyloP100

7.4

PrimateAI

Uncertain

0.76

PROVEAN

Benign

-2.4

N;.;.;.;.;N;.;.;.;.

REVEL

Benign

0.25

Sift

Pathogenic

0.0

D;.;.;.;.;D;.;.;.;.

Sift4G

Pathogenic

0.0

D;D;D;.;D;D;.;.;.;.

Vest4

0.87

MutPred

0.17

Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);Gain of loop (P = 0.0051);

MVP

0.29

MPC

0.017

ClinPred

0.58

GERP RS

6.0

PromoterAI

-0.20

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

gMVP

0.57

Mutation Taster

=219/81

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over