Genetic Variant MROH8:c.257+269A>C (chr20-37178954-T-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_152503.8(MROH8):c.257+269A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000126 in 79,108 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

MROH8
NM_152503.8 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.21

Publications

0 publications found

Variant links:

Genes affected

MROH8 (HGNC:16125): (maestro heat like repeat family member 8) The protein encoded by this gene belongs to the maestro heat-like repeat family. The exact function of this gene is not known, however, in a genome-wide association study using hippocampal atrophy as a quantitative trait, this gene has been associated with Alzheimer's disease (PMID:19668339). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2013]

MROH8 links:

RPN2 (HGNC:10382): (ribophorin II) This gene encodes a type I integral membrane protein found only in the rough endoplasmic reticulum. The encoded protein is part of an N-oligosaccharyl transferase complex that links high mannose oligosaccharides to asparagine residues found in the Asn-X-Ser/Thr consensus motif of nascent polypeptide chains. This protein is similar in sequence to the yeast oligosaccharyl transferase subunit SWP1. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2008]

RPN2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.64).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152503.8. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
MROH8	NM_152503.8	MANE Select	c.257+269A>C	intron	N/A	NP_689716.4
MROH8	NM_213631.3		c.257+269A>C	intron	N/A	NP_998796.1	A0AAG2UW82
MROH8	NM_213632.3		c.257+269A>C	intron	N/A	NP_998797.2	A0AAG2UWF2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
MROH8	ENST00000343811.10	TSL:1	c.257+269A>C	intron	N/A	ENSP00000513568.1	A0A8V8TLY2
MROH8	ENST00000400440.7	TSL:1	c.257+269A>C	intron	N/A	ENSP00000513569.1	A0A8V8TN72
RPN2	ENST00000705448.1		c.-403T>G	5_prime_UTR	Exon 1 of 18	ENSP00000516126.1	A0A994J5J1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.0000126

AC:

AN:

79108

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

41052

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

2414

American (AMR)

AF:

0.00

AC:

AN:

2602

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2632

East Asian (EAS)

AF:

0.00

AC:

AN:

5246

South Asian (SAS)

AF:

0.000184

AC:

AN:

5424

European-Finnish (FIN)

AF:

0.00

AC:

AN:

3574

Middle Eastern (MID)

AF:

0.00

AC:

AN:

342

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

52148

Other (OTH)

AF:

0.00

AC:

AN:

4726

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.64

CADD

Benign

(source)

DANN

Benign

0.64

PhyloP100

1.2

PromoterAI

0.055

Neutral

(source)

Splicing

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over