rs150920905

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP4_StrongBP6_Very_StrongBS2

The NM_170784.3(MKKS):c.16G>A(p.Ala6Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000809 in 1,614,170 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0047 ( 4 hom., cov: 33)

Exomes 𝑓: 0.00040 ( 3 hom. )

Consequence

MKKS
NM_170784.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 1.35

Variant links:

Genes affected

MKKS (HGNC:7108): (MKKS centrosomal shuttling protein) This gene encodes a protein which shares sequence similarity with other members of the type II chaperonin family. The encoded protein is a centrosome-shuttling protein and plays an important role in cytokinesis. This protein also interacts with other type II chaperonin members to form a complex known as the BBSome, which involves ciliary membrane biogenesis. This protein is encoded by a downstream open reading frame (dORF). Several upstream open reading frames (uORFs) have been identified, which repress the translation of the dORF, and two of which can encode small mitochondrial membrane proteins. Mutations in this gene have been observed in patients with Bardet-Biedl syndrome type 6, also known as McKusick-Kaufman syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2023]

MKKS links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -16 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0075124204).

BP6

Variant 20-10413499-C-T is Benign according to our data. Variant chr20-10413499-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 414069.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr20-10413499-C-T is described in Lovd as [Benign].

BS2

High Homozygotes in GnomAd at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
MKKS	NM_170784.3 linkuse as main transcript	c.16G>A	p.Ala6Thr	missense_variant	3/6	ENST00000347364.7
MKKS	NM_018848.3 linkuse as main transcript	c.16G>A	p.Ala6Thr	missense_variant	3/6
MKKS	NR_072977.2 linkuse as main transcript	n.347-4696G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MKKS	ENST00000347364.7 linkuse as main transcript	c.16G>A	p.Ala6Thr	missense_variant	3/6	1	NM_170784.3	P1

Frequencies

GnomAD3 genomes

AF:

0.00472

AC:

718

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0157

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00367

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:

0.0000294

Gnomad OTH

AF:

0.00526

GnomAD3 exomes

AF:

0.00106

AC:

267

AN:

250784

Hom.:

AF XY:

0.000782

AC XY:

106

AN XY:

135492

show subpopulations

Gnomad AFR exome

AF:

0.0149

Gnomad AMR exome

AF:

0.000521

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000884

Gnomad OTH exome

AF:

0.000980

GnomAD4 exome

AF:

0.000402

AC:

587

AN:

1461860

Hom.:

Cov.:

AF XY:

0.000322

AC XY:

234

AN XY:

727234

show subpopulations

Gnomad4 AFR exome

AF:

0.0137

Gnomad4 AMR exome

AF:

0.000939

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000809

Gnomad4 OTH exome

AF:

0.00123

GnomAD4 genome

AF:

0.00472

AC:

719

AN:

152310

Hom.:

Cov.:

AF XY:

0.00490

AC XY:

365

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.0156

Gnomad4 AMR

AF:

0.00366

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00520

Alfa

AF:

0.000607

Hom.:

Bravo

AF:

0.00511

ESP6500AA

AF:

0.0132

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00135

AC:

164

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -

Bardet-Biedl syndrome;C0948368:McKusick-Kaufman syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 31, 2024

- -

McKusick-Kaufman syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

May 06, 2021

See Variant Classification Assertion Criteria. -

Bardet-Biedl syndrome 6

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.42

Cadd

Benign

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.45

T;T

Eigen

Uncertain

0.30

Eigen_PC

Uncertain

0.28

FATHMM_MKL

Uncertain

0.76

MetaRNN

Benign

0.0075

T;T

MetaSVM

Uncertain

0.098

MutationAssessor

Uncertain

2.6

M;M

MutationTaster

Benign

0.93

D;D

PrimateAI

Benign

0.37

PROVEAN

Benign

-1.2

N;N

REVEL

Uncertain

0.38

Sift

Benign

0.053

T;T

Sift4G

Benign

0.079

T;T

Polyphen

0.96

D;D

Vest4

0.065

MVP

0.88

MPC

0.36

ClinPred

0.027

GERP RS

2.9

Varity_R

0.035

gMVP

0.43

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over