11-68903949-G-C

Variant names:

• chr11-68903949-G-C
• rs752980392
• NM_002180.3:c.-4G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_002180.3(IGHMBP2):​c.-4G>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 0.000000703 in 1,423,400 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: 35)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: IGHMBP2 NM_002180.3 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0400
• Publications: 0 publications found

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

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=-0.63).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002180.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IGHMBP2	NM_002180.3	MANE Select	c.-4G>C		5_prime_UTR	Exon 1 of 15	NP_002171.2	P38935
	MRPL21	NM_181514.2	MANE Select	c.-139C>G		upstream_gene	N/A	NP_852615.1	Q7Z2W9-1
	MRPL21	NM_181515.2		c.-407C>G		upstream_gene	N/A	NP_852616.1	Q7Z2W9-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IGHMBP2	ENST00000255078.8	TSL:1 MANE Select	c.-4G>C		5_prime_UTR	Exon 1 of 15	ENSP00000255078.4	P38935
	IGHMBP2	ENST00000925063.1		c.-4G>C		5_prime_UTR	Exon 1 of 14	ENSP00000595122.1
	IGHMBP2	ENST00000675615.1		c.-4G>C		5_prime_UTR	Exon 1 of 14	ENSP00000502413.1	A0A6Q8PGT6

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome AF: 7.03e-7 AC: 1 AN: 1423400 Hom.: 0 Cov.: 33 AF XY: 0.00000142 AC XY: 1 AN XY: 705180

African (AFR) AF: 0.00 AC: 0 AN: 32442

American (AMR) AF: 0.0000263 AC: 1 AN: 38048

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25444

East Asian (EAS) AF: 0.00 AC: 0 AN: 37398

South Asian (SAS) AF: 0.00 AC: 0 AN: 82780

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49692

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5706

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1092978

Other (OTH) AF: 0.00 AC: 0 AN: 58912

GnomAD4 genome Cov.: 35

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	12
DANN	Benign	0.93
PhyloP100		-0.040
PromoterAI		-0.0070	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.0

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

Other links and lift over

dbSNP: rs752980392; hg19: chr11-68671417;