Genetic Variant CASD1:p.Ser277Trp (chr7-94535510-C-G) – 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_022900.5(CASD1):c.830C>G(p.Ser277Trp) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,602 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. S277L) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CASD1
NM_022900.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.03

Publications

0 publications found

Variant links:

Genes affected

CASD1 (HGNC:16014): (CAS1 domain containing 1) Enables N-acetylneuraminate 7-O(or 9-O)-acetyltransferase activity. Involved in carbohydrate metabolic process. Is integral component of Golgi membrane. [provided by Alliance of Genome Resources, Apr 2022]

CASD1 links:

SGCE (HGNC:10808): (sarcoglycan epsilon) This gene encodes the epsilon member of the sarcoglycan family. Sarcoglycans are transmembrane proteins that are components of the dystrophin-glycoprotein complex, which link the actin cytoskeleton to the extracellular matrix. Unlike other family members which are predominantly expressed in striated muscle, the epsilon sarcoglycan is more broadly expressed. Mutations in this gene are associated with myoclonus-dystonia syndrome. This gene is imprinted, with preferential expression from the paternal allele. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. A pseudogene associated with this gene is located on chromosome 2. [provided by RefSeq, Oct 2016]

SGCE Gene-Disease associations (from GenCC):

myoclonic dystonia 11
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Illumina
myoclonus-dystonia syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SGCE links:

ENSG00000309657 (HGNC:):

ENSG00000309657 links:

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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
CASD1	NM_022900.5 link	c.830C>G	p.Ser277Trp	missense_variant	Exon 8 of 18	ENST00000297273.9	NP_075051.4	Q96PB1Q8WZ77

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CASD1	ENST00000297273.9 link	c.830C>G	p.Ser277Trp	missense_variant	Exon 8 of 18	1	NM_022900.5	ENSP00000297273.4		Q96PB1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460602

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726696

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33424

American (AMR)

AF:

0.00

AC:

AN:

44692

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.00

AC:

AN:

39580

South Asian (SAS)

AF:

0.00

AC:

AN:

86144

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53382

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111192

Other (OTH)

AF:

0.00

AC:

AN:

60328

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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.29

BayesDel_addAF

Benign

-0.054

BayesDel_noAF

Benign

-0.32

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.31

Eigen

Uncertain

0.48

Eigen_PC

Uncertain

0.46

FATHMM_MKL

Uncertain

0.89

LIST_S2

Pathogenic

0.98

M_CAP

Benign

0.033

MetaRNN

Uncertain

0.48

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.1

PhyloP100

4.0

PrimateAI

Uncertain

0.64

PROVEAN

Uncertain

-2.5

REVEL

Benign

0.13

Sift

Benign

0.19

Sift4G

Benign

0.062

Polyphen

1.0

Vest4

0.53

MutPred

0.29

Loss of disorder (P = 0.0124);

MVP

0.24

MPC

1.4

ClinPred

0.94

GERP RS

4.3

Varity_R

0.24

gMVP

0.72

Mutation Taster

=74/26

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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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7-94535510-C-G

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