NM_017777.4:c.*322G>T

Variant names:

• chr17-58205757-C-A
• rs185405908
• NM_017777.4:c.*322G>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_017777.4(MKS1):​c.*322G>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00736 in 1,398,458 control chromosomes in the GnomAD database, including 62 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0056 (8 hom., cov: 32)
  • Exomes 𝑓: 0.0076 (54 hom.)
• Consequence: MKS1 NM_017777.4 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: -0.160
• Publications: 0 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):

• Meckel syndrome, type 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Myriad Women’s Health, Labcorp Genetics (formerly Invitae)
• 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 -4 ACMG points.

• BS2: High Homozygotes in GnomAd4 at 8 AR,Unknown gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MKS1	NM_017777.4	c.*322G>T		3_prime_UTR_variant	Exon 18 of 18	ENST00000393119.7	NP_060247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MKS1	ENST00000393119.7	c.*322G>T		3_prime_UTR_variant	Exon 18 of 18	1	NM_017777.4	ENSP00000376827.2

Frequencies

GnomAD3 genomes AF: 0.00562 AC: 855 AN: 152124 Hom.: 8 Cov.: 32

Gnomad AFR AF: 0.00123

Gnomad AMI AF: 0.0450

Gnomad AMR AF: 0.00340

Gnomad ASJ AF: 0.00951

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00642

Gnomad FIN AF: 0.00942

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00779

Gnomad OTH AF: 0.00766

GnomAD4 exome AF: 0.00757 AC: 9435 AN: 1246216 Hom.: 54 Cov.: 31 AF XY: 0.00751 AC XY: 4595 AN XY: 611864

African (AFR) AF: 0.000901 AC: 25 AN: 27760

American (AMR) AF: 0.00218 AC: 67 AN: 30784

Ashkenazi Jewish (ASJ) AF: 0.00936 AC: 187 AN: 19972

East Asian (EAS) AF: 0.00 AC: 0 AN: 21588

South Asian (SAS) AF: 0.00747 AC: 573 AN: 76680

European-Finnish (FIN) AF: 0.00905 AC: 300 AN: 33134

Middle Eastern (MID) AF: 0.0101 AC: 48 AN: 4754

European-Non Finnish (NFE) AF: 0.00800 AC: 7865 AN: 983194

Other (OTH) AF: 0.00765 AC: 370 AN: 48350

GnomAD4 genome AF: 0.00562 AC: 856 AN: 152242 Hom.: 8 Cov.: 32 AF XY: 0.00557 AC XY: 415 AN XY: 74440

African (AFR) AF: 0.00123 AC: 51 AN: 41522

American (AMR) AF: 0.00340 AC: 52 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.00951 AC: 33 AN: 3470

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5176

South Asian (SAS) AF: 0.00663 AC: 32 AN: 4826

European-Finnish (FIN) AF: 0.00942 AC: 100 AN: 10614

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00779 AC: 530 AN: 68022

Other (OTH) AF: 0.00758 AC: 16 AN: 2110

Alfa AF: 0.00107 Hom.: 0

Bravo AF: 0.00527

Asia WGS AF: 0.00289 AC: 12 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:1

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

MKS1: BS2 -

Meckel syndrome, type 1 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Bardet-Biedl syndrome 13 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	17
DANN	Benign	0.78
PhyloP100		-0.16
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.24		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.24		Position offset: -13

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs185405908; hg19: chr17-56283118;