Genetic Variant POMT1:c.2004-20C>T (chr9-131522912-C-T) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001077365.2(POMT1):c.2004-20C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000355 in 1,570,170 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00044 ( 1 hom., cov: 33)

Exomes 𝑓: 0.00035 ( 3 hom. )

Consequence

POMT1
NM_001077365.2 intron

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 1.20

Publications

0 publications found

Variant links:

Genes affected

POMT1 (HGNC:9202): (protein O-mannosyltransferase 1) The protein encoded by this gene is an O-mannosyltransferase that requires interaction with the product of the POMT2 gene for enzymatic function. The encoded protein is found in the membrane of the endoplasmic reticulum. Defects in this gene are a cause of Walker-Warburg syndrome (WWS) and limb-girdle muscular dystrophy type 2K (LGMD2K). Several transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2008]

POMT1 Gene-Disease associations (from GenCC):

muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Laboratory for Molecular Medicine, Genomics England PanelApp, G2P
myopathy caused by variation in POMT1
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B1
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
autosomal recessive limb-girdle muscular dystrophy type 2K
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy with cerebellar involvement
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy with intellectual disability
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
congenital muscular dystrophy without intellectual disability
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
muscle-eye-brain disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
muscular dystrophy-dystroglycanopathy, type A
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

POMT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.81).

BP6

Variant 9-131522912-C-T is Benign according to our data. Variant chr9-131522912-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 260146.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.000346 (490/1417846) while in subpopulation MID AF = 0.00776 (32/4122). AF 95% confidence interval is 0.00565. There are 3 homozygotes in GnomAdExome4. There are 280 alleles in the male GnomAdExome4 subpopulation. Median coverage is 34. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001077365.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
POMT1	NM_001077365.2	MANE Select	c.2004-20C>T	intron	N/A	NP_001070833.1	A0A140VKE0
POMT1	NM_001353193.2		c.2070-20C>T	intron	N/A	NP_001340122.2	Q9Y6A1-1
POMT1	NM_007171.4		c.2070-20C>T	intron	N/A	NP_009102.4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
POMT1	ENST00000402686.8	TSL:1 MANE Select	c.2004-20C>T	intron	N/A	ENSP00000385797.4	Q9Y6A1-2
POMT1	ENST00000372228.9	TSL:1	c.2070-20C>T	intron	N/A	ENSP00000361302.3	Q9Y6A1-1
POMT1	ENST00000423007.6	TSL:1	c.2061-20C>T	intron	N/A	ENSP00000404119.2	A0A1V1FTP4

Frequencies

GnomAD3 genomes

AF:

0.000440

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00111

Gnomad ASJ

AF:

0.00288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000515

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000598

AC:

115

AN:

192394

AF XY:

0.000626

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00105

Gnomad ASJ exome

AF:

0.00320

Gnomad EAS exome

AF:

0.000135

Gnomad FIN exome

AF:

0.0000800

Gnomad NFE exome

AF:

0.000451

Gnomad OTH exome

AF:

0.00211

GnomAD4 exome

AF:

0.000346

AC:

490

AN:

1417846

Hom.:

Cov.:

AF XY:

0.000399

AC XY:

280

AN XY:

702434

show subpopulations

African (AFR)

AF:

0.000122

AC:

AN:

32718

American (AMR)

AF:

0.000944

AC:

AN:

39188

Ashkenazi Jewish (ASJ)

AF:

0.00211

AC:

AN:

25534

East Asian (EAS)

AF:

0.0000526

AC:

AN:

38038

South Asian (SAS)

AF:

0.000170

AC:

AN:

82156

European-Finnish (FIN)

AF:

0.0000231

AC:

AN:

43370

Middle Eastern (MID)

AF:

0.00776

AC:

AN:

4122

European-Non Finnish (NFE)

AF:

0.000278

AC:

304

AN:

1093788

Other (OTH)

AF:

0.000713

AC:

AN:

58932

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

119

149

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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

AF:

0.000440

AC:

AN:

152324

Hom.:

Cov.:

AF XY:

0.000510

AC XY:

AN XY:

74482

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41576

American (AMR)

AF:

0.00111

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.00288

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.000207

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000515

AC:

AN:

68018

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.493

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.000969

Hom.:

Bravo

AF:

0.000427

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (2)

Walker-Warburg congenital muscular dystrophy;C1836373:Autosomal recessive limb-girdle muscular dystrophy type 2K;C5436962:Muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B1 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.81

CADD

Benign

5.9

(source)

DANN

Benign

0.46

PhyloP100

1.2

Mutation Taster

=100/0

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over