dbSNP rs758821712: MKKS:p.Cys438Phe (chr20-10405647-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_170784.3(MKKS):c.1313G>T(p.Cys438Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,826 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C438Y) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MKKS
NM_170784.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.533

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

McKusick-Kaufman syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
Bardet-Biedl syndrome 6
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
Bardet-Biedl syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

MKKS links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MKKS	NM_170784.3 link	c.1313G>T	p.Cys438Phe	missense_variant	Exon 6 of 6	ENST00000347364.7	NP_740754.1	Q9NPJ1B7Z3W9
MKKS	NM_018848.3 link	c.1313G>T	p.Cys438Phe	missense_variant	Exon 6 of 6		NP_061336.1	Q9NPJ1B7Z3W9
MKKS	NR_072977.2 link	n.674G>T		non_coding_transcript_exon_variant	Exon 5 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MKKS	ENST00000347364.7 link	c.1313G>T	p.Cys438Phe	missense_variant	Exon 6 of 6	1	NM_170784.3	ENSP00000246062.4	Q9NPJ1
MKKS	ENST00000399054.6 link	c.1313G>T	p.Cys438Phe	missense_variant	Exon 6 of 6	1		ENSP00000382008.2	Q9NPJ1
MKKS	ENST00000651692.1 link	c.1313G>T	p.Cys438Phe	missense_variant	Exon 7 of 7			ENSP00000498849.1	Q9NPJ1
MKKS	ENST00000652676.1 link	n.957G>T		non_coding_transcript_exon_variant	Exon 7 of 7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461826

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727220

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111970

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.079

BayesDel_addAF

Uncertain

0.092

BayesDel_noAF

Benign

-0.11

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.91

D;D

Eigen

Benign

-0.18

Eigen_PC

Benign

-0.37

FATHMM_MKL

Benign

0.50

LIST_S2

Benign

0.67

.;T

M_CAP

Uncertain

0.10

MetaRNN

Uncertain

0.63

D;D

MetaSVM

Uncertain

0.25

MutationAssessor

Pathogenic

3.0

M;M

PhyloP100

0.53

PrimateAI

Benign

0.33

PROVEAN

Pathogenic

-5.5

D;D

REVEL

Uncertain

0.49

Sift

Benign

0.034

D;D

Sift4G

Uncertain

0.011

D;D

Polyphen

0.99

D;D

Vest4

0.38

MutPred

0.64

Gain of catalytic residue at C438 (P = 0.0214);Gain of catalytic residue at C438 (P = 0.0214);

MVP

0.96

MPC

0.57

ClinPred

0.99

GERP RS

0.34

Varity_R

0.34

gMVP

0.80

Mutation Taster

=82/18

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

Computational scores

Splicing

Publications

Other links and lift over