6-31530198-T-G

Variant names:

• chr6-31530198-T-G
• rs3219190
• NM_001011700.3:c.*263T>G

Variant summary

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

The NM_001011700.3(MCCD1):​c.*263T>G variant causes a 3 prime UTR 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: MCCD1 NM_001011700.3 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.73
• Publications: 0 publications found

Genes affected

MCCD1 (HGNC:20668): (mitochondrial coiled-coil domain 1) Predicted to be located in mitochondrion. [provided by Alliance of Genome Resources, Apr 2022]

DDX39B (HGNC:13917): (DExD-box helicase 39B) This gene encodes a member of the DEAD box family of RNA-dependent ATPases that mediate ATP hydrolysis during pre-mRNA splicing. The encoded protein is an essential splicing factor required for association of U2 small nuclear ribonucleoprotein with pre-mRNA, and it also plays an important role in mRNA export from the nucleus to the cytoplasm. This gene belongs to a cluster of genes localized in the vicinity of the genes encoding tumor necrosis factor alpha and tumor necrosis factor beta. These genes are all within the human major histocompatibility complex class III region. Mutations in this gene may be associated with rheumatoid arthritis. Alternative splicing results in multiple transcript variants. Related pseudogenes have been identified on both chromosomes 6 and 11. Read-through transcription also occurs between this gene and the upstream ATP6V1G2 (ATPase, H+ transporting, lysosomal 13kDa, V1 subunit G2) gene. [provided by RefSeq, Feb 2011]

ATP6V1G2-DDX39B (HGNC:41999): (ATP6V1G2-DDX39B readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring ATP6V1G2 (ATPase, H+ transporting, lysosomal 13kDa, V1 subunit G2) and DDX39B (DEAD box polypeptide 39B) genes located in the major histocompatibility complex class III region of chromosome 6. The read-through transcript and is a candidate for nonsense-mediated mRNA decay (NMD), and is thus unlikely to produce a protein product. [provided by RefSeq, Feb 2011]

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=-0.59).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCCD1	NM_001011700.3	c.*263T>G		3_prime_UTR_variant	Exon 2 of 2	ENST00000376191.3	NP_001011700.2
DDX39B	NM_004640.7	c.*236A>C		downstream_gene_variant		ENST00000396172.6	NP_004631.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MCCD1	ENST00000376191.3	c.*263T>G		3_prime_UTR_variant	Exon 2 of 2	1	NM_001011700.3	ENSP00000365362.2
DDX39B	ENST00000396172.6	c.*236A>C		downstream_gene_variant		1	NM_004640.7	ENSP00000379475.1
ATP6V1G2-DDX39B	ENST00000376185.5	n.*1737A>C		downstream_gene_variant		2		ENSP00000365356.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 630344 Hom.: 0 Cov.: 8 AF XY: 0.00 AC XY: 0 AN XY: 320824

African (AFR) AF: 0.00 AC: 0 AN: 15434

American (AMR) AF: 0.00 AC: 0 AN: 17278

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 14470

East Asian (EAS) AF: 0.00 AC: 0 AN: 31274

South Asian (SAS) AF: 0.00 AC: 0 AN: 45730

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 36828

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2292

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 435606

Other (OTH) AF: 0.00 AC: 0 AN: 31432

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.59
CADD	Benign	4.8
DANN	Benign	0.88
PhyloP100		-1.7

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: rs3219190; hg19: chr6-31497975;