chr9-137096335-G-T

Variant names:

• chr9-137096335-G-T
• rs1554752187
• NM_016219.5:c.564G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_016219.5(MAN1B1):​c.564G>T​(p.Arg188Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. R188R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MAN1B1 NM_016219.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.203
• Publications: 0 publications found

Genes affected

MAN1B1 (HGNC:6823): (mannosidase alpha class 1B member 1) This gene encodes an enzyme belonging to the glycosyl hydrolase 47 family. This enzyme functions in N-glycan biosynthesis, and is a class I alpha-1,2-mannosidase that specifically converts Man9GlcNAc to Man8GlcNAc isomer B. It is required for N-glycan trimming to Man5-6GlcNAc2 in the endoplasmic-reticulum-associated degradation pathway. Mutations in this gene cause autosomal-recessive intellectual disability. Alternative splicing results in multiple transcript variants. A related pseudogene has been identified on chromosome 11. [provided by RefSeq, Dec 2011]

MAN1B1 Gene-Disease associations (from GenCC):

• MAN1B1-congenital disorder of glycosylation

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• Rafiq syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09168202).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MAN1B1	NM_016219.5	c.564G>T	p.Arg188Ser	missense_variant	Exon 4 of 13	ENST00000371589.9	NP_057303.2
MAN1B1	XM_006716945.5	c.564G>T	p.Arg188Ser	missense_variant	Exon 4 of 12		XP_006717008.1
MAN1B1	NR_045720.2	n.579G>T		non_coding_transcript_exon_variant	Exon 4 of 13
MAN1B1	NR_045721.2	n.710G>T		non_coding_transcript_exon_variant	Exon 5 of 14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MAN1B1	ENST00000371589.9	c.564G>T	p.Arg188Ser	missense_variant	Exon 4 of 13	1	NM_016219.5	ENSP00000360645.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.055	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	8.6
DANN	Benign	0.93
DEOGEN2	Benign	0.021	T;T
Eigen	Benign	-0.78
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.085	N
LIST_S2	Benign	0.57	T;T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.092	T;T
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	1.6	L;.
PhyloP100		0.20
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-1.4	N;.
REVEL	Benign	0.14
Sift	Benign	0.22	T;.
Sift4G	Benign	0.63	T;T
Polyphen		0.11	B;.
Vest4		0.19
MutPred		0.18		Gain of phosphorylation at R188 (P = 0.0143);.;
MVP		0.64
MPC		0.099
ClinPred		0.043	T
GERP RS		2.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.074
gMVP		0.26
Mutation Taster		=89/11	polymorphism

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: rs1554752187; hg19: chr9-139990787;