15-75356033-C-A

Position:

• chr15-75356033-C-A

Variant summary

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

The NM_006715.4(MAN2C1):​c.2997-1G>T variant causes a splice acceptor, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MAN2C1 NM_006715.4 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.91

Genes affected

NEIL1 (HGNC:18448): (nei like DNA glycosylase 1) This gene is a member of the Nei endonuclease VIII-like gene family which encodes DNA glycosylases. The encoded enzyme participates in the DNA repair pathway by initiating base excision repair by removing damaged bases, primarily oxidized pyrimidines. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2012]

MAN2C1 (HGNC:6827): (mannosidase alpha class 2C member 1) Predicted to enable alpha-mannosidase activity. Predicted to be involved in oligosaccharide catabolic process. Located in nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEIL1	NM_024608.4	c.*999C>A		3_prime_UTR_variant	10/10	ENST00000355059.9	NP_078884.2
MAN2C1	NM_006715.4	c.2997-1G>T		splice_acceptor_variant, intron_variant		ENST00000267978.10	NP_006706.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEIL1	ENST00000355059.9	c.*999C>A		3_prime_UTR_variant	10/10	2	NM_024608.4	ENSP00000347170.4
MAN2C1	ENST00000267978.10	c.2997-1G>T		splice_acceptor_variant, intron_variant		1	NM_006715.4	ENSP00000267978.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital disorder of deglycosylation 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

3billion, Medical Genetics

May 22, 2022

The variant is not observed in the gnomAD v2.1.1 dataset. Canonical splice site: predicted to alter splicing and result in a loss or disruption of normal protein function. The predicted truncated protein may be shortened by less than 10%. Therefore, this variant is classified as uncertain significanceaccording to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	33
DANN	Uncertain	0.99
Eigen	Pathogenic	0.95
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	1.0	D
GERP RS		4.5

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.92
SpliceAI score (max)		0.97		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.32		Position offset: -24
DS_AL_spliceai		0.97		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr15-75648374;