chr11-68903923-G-C

Variant names:

• chr11-68903923-G-C
• rs369459369
• NM_002180.3:c.-30G>C

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_002180.3(IGHMBP2):​c.-30G>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000386 in 1,595,658 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.00041 (0 hom., cov: 34)
  • Exomes 𝑓: 0.00038 (1 hom.)
• Consequence: IGHMBP2 NM_002180.3 5_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -3.97

Genes affected

IGHMBP2 (HGNC:5542): (immunoglobulin mu DNA binding protein 2) This gene encodes a helicase superfamily member that binds a specific DNA sequence from the immunoglobulin mu chain switch region. Mutations in this gene lead to spinal muscle atrophy with respiratory distress type 1. [provided by RefSeq, Jul 2008]

MRPL21 (HGNC:14479): (mitochondrial ribosomal protein L21) Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. This gene encodes a 39S subunit protein. Multiple transcript variants encoding different isoforms were identified through sequence analysis although some may be subject to nonsense-mediated decay (NMD). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.04).
• BP6: Variant 11-68903923-G-C is Benign according to our data. Variant chr11-68903923-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 379725.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IGHMBP2	NM_002180.3	c.-30G>C		5_prime_UTR_variant	Exon 1 of 15	ENST00000255078.8	NP_002171.2
MRPL21	NM_181514.2	c.-113C>G		upstream_gene_variant		ENST00000362034.7	NP_852615.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IGHMBP2	ENST00000255078	c.-30G>C		5_prime_UTR_variant	Exon 1 of 15	1	NM_002180.3	ENSP00000255078.4
MRPL21	ENST00000362034.7	c.-113C>G		upstream_gene_variant		1	NM_181514.2	ENSP00000354580.2

Frequencies

GnomAD3 genomes AF: 0.000414 AC: 63 AN: 152264 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.0000723

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00226

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000485

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000603 AC: 126 AN: 209022 Hom.: 1 AF XY: 0.000664 AC XY: 76 AN XY: 114474

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000655

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000213

Gnomad FIN exome AF: 0.00262

Gnomad NFE exome AF: 0.000691

Gnomad OTH exome AF: 0.00131

GnomAD4 exome AF: 0.000383 AC: 553 AN: 1443394 Hom.: 1 Cov.: 33 AF XY: 0.000417 AC XY: 299 AN XY: 716870

Gnomad4 AFR exome AF: 0.0000303

Gnomad4 AMR exome AF: 0.0000479

Gnomad4 ASJ exome AF: 0.0000388

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000118

Gnomad4 FIN exome AF: 0.00255

Gnomad4 NFE exome AF: 0.000361

Gnomad4 OTH exome AF: 0.000185

GnomAD4 genome AF: 0.000414 AC: 63 AN: 152264 Hom.: 0 Cov.: 34 AF XY: 0.000524 AC XY: 39 AN XY: 74394

Gnomad4 AFR AF: 0.0000723

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00226

Gnomad4 NFE AF: 0.000485

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.000574 Hom.: 0

Bravo AF: 0.000178

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Mar 21, 2017

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	0.27
DANN	Benign	0.38
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

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: rs369459369; hg19: chr11-68671391;