NM_017777.4:c.763G>C

Variant names:

• chr17-58213077-C-G
• rs201237547
• NM_017777.4:c.763G>C

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4 BS2

The NM_017777.4(MKS1):​c.763G>C​(p.Gly255Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000471 in 1,614,066 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G255W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000049 (2 hom.)
• Consequence: MKS1 NM_017777.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:9
• Conservation: PhyloP100: 3.97
• Publications: 5 publications found

Genes affected

MKS1 (HGNC:7121): (MKS transition zone complex subunit 1) The protein encoded by this gene localizes to the basal body and is required for formation of the primary cilium in ciliated epithelial cells. Mutations in this gene result in Meckel syndrome type 1 and in Bardet-Biedl syndrome type 13. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2009]

MKS1 Gene-Disease associations (from GenCC):

• ciliopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Meckel syndrome, type 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Myriad Women’s Health
• Bardet-Biedl syndrome 13

  Inheritance: Unknown, AR Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P
• Joubert syndrome 28

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Bardet-Biedl syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Joubert syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Joubert syndrome with ocular defect

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Meckel syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.35569638).
• BS2: High Homozygotes in GnomAdExome4 at 2 AR,Unknown gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017777.4. 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
	MKS1	NM_017777.4	MANE Select	c.763G>C	p.Gly255Arg	missense	Exon 8 of 18	NP_060247.2	Q9NXB0-1
	MKS1	NM_001321269.2		c.763G>C	p.Gly255Arg	missense	Exon 8 of 17	NP_001308198.1	A0A7I2V2M0
	MKS1	NM_001330397.2		c.763G>C	p.Gly255Arg	missense	Exon 8 of 16	NP_001317326.1	H0Y2S2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MKS1	ENST00000393119.7	TSL:1 MANE Select	c.763G>C	p.Gly255Arg	missense	Exon 8 of 18	ENSP00000376827.2	Q9NXB0-1
	MKS1	ENST00000537529.7	TSL:1	c.334G>C	p.Gly112Arg	missense	Exon 8 of 18	ENSP00000442096.3	A0A0S2Z5Z2
	MKS1	ENST00000966002.1		c.763G>C	p.Gly255Arg	missense	Exon 8 of 18	ENSP00000636061.1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152190 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000132 AC: 33 AN: 249580 AF XY: 0.000155

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000556

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000493 AC: 72 AN: 1461876 Hom.: 2 Cov.: 33 AF XY: 0.0000729 AC XY: 53 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.000327 AC: 13 AN: 39700

South Asian (SAS) AF: 0.000626 AC: 54 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111998

Other (OTH) AF: 0.0000331 AC: 2 AN: 60396

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152190 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74352

African (AFR) AF: 0.0000241 AC: 1 AN: 41426

American (AMR) AF: 0.00 AC: 0 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.000192 AC: 1 AN: 5202

South Asian (SAS) AF: 0.000207 AC: 1 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68046

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000189

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000121 AC: 1

ExAC AF: 0.000166 AC: 20

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Bardet-Biedl syndrome 13 (2)
-	2	-	Meckel syndrome, type 1 (2)
-	1	-	Bardet-Biedl syndrome 13;C3714506:Meckel syndrome, type 1;C4310705:Joubert syndrome 28 (1)
-	1	-	Joubert syndrome 28 (1)
-	1	-	Meckel-Gruber syndrome;C5979921:Joubert syndrome (1)
-	1	-	MKS1-related disorder (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.36
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D
Eigen	Benign	0.066
Eigen_PC	Benign	0.085
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-0.35	T
MutationAssessor	Uncertain	2.5	M
PhyloP100		4.0
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-2.9	D
REVEL	Uncertain	0.40
Sift	Uncertain	0.011	D
Sift4G	Uncertain	0.0070	D
Polyphen		0.56	P
Vest4		0.55
MutPred		0.36		Loss of loop (P = 0.0073)
MVP		0.73
MPC		0.32
ClinPred		0.26	T
GERP RS		4.9
Varity_R		0.27
gMVP		0.84
Mutation Taster		=94/6	polymorphism

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

Other links and lift over

dbSNP: rs201237547; hg19: chr17-56290438;