chr22-33650509-C-G

Position:

• chr22-33650509-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_133642.5(LARGE1):​c.266G>C​(p.Arg89Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,774 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. 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. R89Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: LARGE1 NM_133642.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.35

Genes affected

LARGE1 (HGNC:6511): (LARGE xylosyl- and glucuronyltransferase 1) This gene encodes a member of the N-acetylglucosaminyltransferase gene family. It encodes a glycosyltransferase which participates in glycosylation of alpha-dystroglycan, and may carry out the synthesis of glycoprotein and glycosphingolipid sugar chains. It may also be involved in the addition of a repeated disaccharide unit. The protein encoded by this gene is the glycotransferase that adds the final xylose and glucuronic acid to alpha-dystroglycan and thereby allows alpha-dystroglycan to bind ligands including laminin 211 and neurexin. Mutations in this gene cause several forms of congenital muscular dystrophy characterized by cognitive disability and abnormal glycosylation of alpha-dystroglycan. Alternative splicing of this gene results in multiple transcript variants that encode the same protein. [provided by RefSeq, May 2018]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1305205).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LARGE1	NM_133642.5	c.266G>C	p.Arg89Pro	missense_variant	3/15	ENST00000397394.8	NP_598397.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LARGE1	ENST00000397394.8	c.266G>C	p.Arg89Pro	missense_variant	3/15	5	NM_133642.5	ENSP00000380549.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460774 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726784

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.092
BayesDel_addAF	Benign	-0.041	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	17
DANN	Uncertain	0.99
DEOGEN2	Benign	0.25	T;T;.;.;.;.
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.20
FATHMM_MKL	Benign	0.28	N
LIST_S2	Uncertain	0.87	.;D;D;D;D;D
M_CAP	Benign	0.0095	T
MetaRNN	Benign	0.13	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-0.83	N;N;N;D;D;D
REVEL	Benign	0.16
Sift	Benign	0.030	D;D;D;D;D;D
Sift4G	Benign	0.30	T;T;T;D;.;.
Polyphen		0.43	B;B;P;.;.;.
Vest4		0.51
MVP		0.36
MPC		0.75
ClinPred		0.39	T
GERP RS		4.7
Varity_R		0.20
gMVP		0.46

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

LitVar

Other links and lift over

dbSNP: rs142272515; hg19: chr22-34046495;