NM_000261.2:c.1102C>T

Variant names:

• chr1-171636338-G-A
• rs74315329
• NM_000261.2:c.1102C>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PS3_Moderate PS4 PP1_Strong PM4

This summary comes from the ClinGen Evidence Repository: The c.1102C>T variant in MYOC is predicted to cause a change in the length of the protein due to the insertion of a terminating codon instead of the usual Glutamine at amino acid 368 (p.Gln368Ter). This variant is predicted to cause a deletion of ≥ 10% of the protein within the conserved olfactomedin domain, meeting PM4. Although this variant had a minor allele frequency of 0.003344 in the European (Finnish) population of gnomAD (84 alleles out of 25,118), which meets the ≥ 0.001 threshold for BS1, Gln368Ter is exempt from this criterion due to its incomplete penetrance and the presence of a common disease haplotype in all carriers. There was no computational evidence predicting a damaging or benign impact of this variant on MYOC function. This variant is exempt from the rule which normally does not allow the application of PS4 unless PM2_Supporting is met. 23 probands with juvenile or primary open angle glaucoma (JOAG or POAG) have been reported carrying this variant (PMIDs: 11535458, 11004290, 10815160, 22736945, 11803488, 12189160), which met PS4 (≥ 15 probands). As this variant is exempt from the application of BS1, PP1 has been applied. 52 segregations in 10 families, with JOAG or POAG, have been reported (PMIDs: 11004290, 10815160, 11535458), which fulfilled PP1_Strong (≥ 7 meioses in > 1 family). There were many more probands and family studies published than presented here. A previous study (PMID:16466712) demonstrated that the Gln368Ter protein had reduced secretion levels compared to wild type myocilin protein and met the OddsPath threshold for PS3_Moderate (> 4.3), indicating that this variant did impact protein function. In summary, this variant met the criteria to receive a score of 12 and to be classified as pathogenic (pathogenic classification ≥ 10) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PS4, PP1_Strong, PM4, PS3_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA119172/MONDO:0020367/019

• Frequency:
  • Genomes: 𝑓 0.00085 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0012 (1 hom.)
• Consequence: MYOC NM_000261.2 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:14 B:1
• Conservation: PhyloP100: 3.44
• Publications: 157 publications found

Genes affected

MYOC (HGNC:7610): (myocilin) MYOC encodes the protein myocilin, which is believed to have a role in cytoskeletal function. MYOC is expressed in many occular tissues, including the trabecular meshwork, and was revealed to be the trabecular meshwork glucocorticoid-inducible response protein (TIGR). The trabecular meshwork is a specialized eye tissue essential in regulating intraocular pressure, and mutations in MYOC have been identified as the cause of hereditary juvenile-onset open-angle glaucoma. [provided by RefSeq, Jul 2008]

MYOCOS (HGNC:53429): (myocilin opposite strand)

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM4: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000261.2. 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
	MYOC	NM_000261.2	MANE Select	c.1102C>T	p.Gln368*	stop_gained	Exon 3 of 3	NP_000252.1	Q99972

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOC	ENST00000037502.11	TSL:1 MANE Select	c.1102C>T	p.Gln368*	stop_gained	Exon 3 of 3	ENSP00000037502.5	Q99972
	MYOC	ENST00000971579.1		c.1207C>T	p.Gln403*	stop_gained	Exon 3 of 3	ENSP00000641638.1
	MYOC	ENST00000877923.1		c.1168C>T	p.Gln390*	stop_gained	Exon 4 of 4	ENSP00000547982.1

Frequencies

GnomAD3 genomes AF: 0.000849 AC: 129 AN: 152014 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000387

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000208

Gnomad FIN AF: 0.00198

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00126

Gnomad OTH AF: 0.000479

GnomAD2 exomes AF: 0.00111 AC: 279 AN: 251404 AF XY: 0.00119

Gnomad AFR exome AF: 0.000246

Gnomad AMR exome AF: 0.000173

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00360

Gnomad NFE exome AF: 0.00158

Gnomad OTH exome AF: 0.000815

GnomAD4 exome AF: 0.00119 AC: 1741 AN: 1461842 Hom.: 1 Cov.: 31 AF XY: 0.00118 AC XY: 859 AN XY: 727232

African (AFR) AF: 0.000179 AC: 6 AN: 33480

American (AMR) AF: 0.000179 AC: 8 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26096

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.000128 AC: 11 AN: 86258

European-Finnish (FIN) AF: 0.00356 AC: 190 AN: 53420

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

European-Non Finnish (NFE) AF: 0.00134 AC: 1487 AN: 1112004

Other (OTH) AF: 0.000646 AC: 39 AN: 60392

GnomAD4 genome AF: 0.000848 AC: 129 AN: 152132 Hom.: 0 Cov.: 32 AF XY: 0.000807 AC XY: 60 AN XY: 74370

African (AFR) AF: 0.000386 AC: 16 AN: 41504

American (AMR) AF: 0.000262 AC: 4 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3454

East Asian (EAS) AF: 0.00 AC: 0 AN: 5174

South Asian (SAS) AF: 0.000208 AC: 1 AN: 4808

European-Finnish (FIN) AF: 0.00198 AC: 21 AN: 10598

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

European-Non Finnish (NFE) AF: 0.00126 AC: 86 AN: 68004

Other (OTH) AF: 0.000474 AC: 1 AN: 2108

Alfa AF: 0.00111 Hom.: 0

Bravo AF: 0.000718

TwinsUK AF: 0.00135 AC: 5

ALSPAC AF: 0.00234 AC: 9

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.00140 AC: 12

ExAC AF: 0.00109 AC: 132

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.00115

EpiControl AF: 0.00119

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
7	-	1	Glaucoma 1, open angle, A (8)
5	-	-	not provided (5)
1	-	-	Glaucoma of childhood (1)
1	-	-	Primary open angle glaucoma (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.89	D
PhyloP100		3.4
Vest4		0.87
GERP RS		4.5
Mutation Taster		=2/198	disease causing (ClinVar)

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: rs74315329; hg19: chr1-171605478; COSMIC: COSV50674786;